Change search
Refine search result
1 - 34 of 34
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Adli, E.
    et al.
    Dabrowski, A. E.
    Döbert, S.
    Lillestøl, R.
    Olvegård, Maja
    Schulte, D.
    Syratchev, I.
    Experimental Program for the Clic Test Facility 3 Test Beam Line2010In: Proceedings of IPAC10, Kyoto, Japan, 2010, p. 4410-4412Conference paper (Other academic)
  • 2. Adli, E.
    et al.
    Döbert, S.
    Lillestøl, R.
    Olvegård, Maja
    Syratchev, I.
    Carrillo, D.
    Toral, F.
    Faus-Golfe, A.
    Garcia-Garrigos, J. J.
    Kubyshin, Y.
    Montoro, G.
    Commissioning status of the decelerator test beam line in CTF32010In: Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan, 2010, p. 85-87Conference paper (Other academic)
  • 3.
    Bhattacharyya, Anirban
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Eriksson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Gajewski, Konrad
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jönsson, Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Li, Han
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lofnes, Tor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Santiago Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Wedberg, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    ESS RF Source and Spoke Cavity Test Plan2015Report (Other academic)
    Abstract [en]

    This report describes the test plan for the first high power RF source, ESS prototype double spoke cavity and ESS prototype cryomodule at the FREIA Laboratory.

  • 4.
    Borgmann, Ch.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ögren, Jim
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    The Momentum Distribution Of The Decelerated Drive Beam In Clic And The Two-Beam Test Stand At Ctf32014In: Proceedings of IPAC2014, Dresden, Germany., 2014, p. 62-64Conference paper (Other academic)
  • 5. Chevallay, E.
    et al.
    Csatari, M.
    Dabrowski, A.
    Doebert, S.
    Egger, D.
    Fedosseev, V.
    Mete, O.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Petrarca, M.
    PHIN photo-injector as the CLIC drive beam source2012In: Journal of Physics: Conference Series, Vol. 347, no 1Article in journal (Refereed)
  • 6. Csatari Divall, M
    et al.
    Andersson, A
    Bolzon, B
    Bravin, E
    Chevallay, E
    Dabrowski, A
    Doebert, S
    Drozdy, A
    Fedosseev, V
    Hessler, C
    Lefevre, T
    Livesley, S
    Losito, R
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Petrarca, M
    Rabiller, A N
    Egger, D
    Mete, O
    High Charge PHIN Photo Injector at CERN with Fast Phase switching within the Bunch Train for Beam Combination2011In: Proceedings of IPAC 2011 conference, San Sebastián, Spain, 2011, p. 430-432Conference paper (Other academic)
  • 7.
    Csatari Divall, Marta
    et al.
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Andersson, Alexandra
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Bolzon, Benoit
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Bravin, Enrico
    CERN, European Organization for Nuclear Research, Geneva, Schweiz.
    Chevallay, Eric
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Döbert, Steffen
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Drozdy, A.
    Fedosseev, V.
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Hessler, Christoph
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Lefèvre, Thibaut
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Livesley, S.
    Mete, Öznur
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Rabiller, Aurelie
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Comprehensive user manual for the phase-coding system setup and operation with PHIN including the measurements performed with the beam2012Report (Other academic)
  • 8. Dabrowski, A.
    et al.
    Bettoni, S.
    Braun, H. H.
    Bravin, E.
    Corsini, R.
    Döbert, S.
    Dutriat, C.
    Lefèvre, T.
    Olvegård, Maja
    Skowronski, P. K.
    Tecker, F.
    Transient beam loading compensation in CTF32008In: Proceedings of LINAC08, Victoria, BC, Canada, 2008, p. 585-587Conference paper (Other academic)
  • 9. Egger, D.
    et al.
    Mete, O.
    Csatari, M.
    Dabrowski, A.
    Doebert, S.
    Lefevre, T.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Petrarca, M.
    Performance of the Time Resolved Spectrometer for the 5 MeV Photo-Injector PHIN2011In: Proceedings of DIPAC2011, Hamburg, Germany, 2011, p. 431-433Conference paper (Other academic)
  • 10.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Borgmann, Ch.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, R.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Kovermann, J.
    Novel Diagnostics for Breakdown Studies2013In: Proceedings of IBIC2013, Oxford, UK, 2013, p. 287-290Conference paper (Other academic)
  • 11.
    Jacewicz, Marek
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Borgmann, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ögren, Jim
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    General-purpose spectrometer for vacuum breakdown diagnostics for the 12 GHz test stand at CERN2014Conference paper (Other academic)
  • 12.
    Lillestol, Reidar
    et al.
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Döbert, Steffen
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Adli, Erik
    University of Oslo, Norway.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Electron beam deceleration measurements using the decelerator test beam line in the Compact Linear Collider test facility2014In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 17, no 3, p. 031003-Article in journal (Refereed)
    Abstract [en]

    We discuss beam deceleration through a series of 12 power extraction and transfer structures, at the CLIC test facility 3 at CERN, as a proof-of-principle of the CLIC deceleration scheme. Up to 36% of the kinetic energy of an electron drive beam is extracted and converted to 12 GHz rf power. We look at the average and maximum energy loss of the particles, and compare them with simulations performed with the placet tracking code. The measured final energy is also compared to predictions based on the measured beam current and rf power in the structures. In the analysis we make use of the charge distribution form factor, taking into account the bunch length and the bunch phase. Finally, we look at the evolution of the transverse emittance with deceleration and compare the measured emittance with simulations.

  • 13. Lillestøl, R. L.
    et al.
    Döbert, S
    Olvegård, Maja
    Adli, E
    Experimental Results from the Test Beam Line in the CLIC Test Facility 32013In: Proceedings of IPAC 2013, Shanghai, China, 2013Conference paper (Other academic)
  • 14. Lillestøl, R. L.
    et al.
    Döbert, S.
    Olvegård, Maja
    Rabiller, A.
    Sterbini, G.
    Adli, E.
    Experimental verification of the CLIC Decelerator with the test Beam Line in the CLIC test facility 32012In: Proceedings of IPAC 2012, New Orleans, Louisiana, USA, 2012, p. 1885-1887Conference paper (Other academic)
  • 15. Mete, O.
    et al.
    Chevallay, E.
    Csatari, M.
    Dabrowski, A.
    Döbert, S.
    Egger, D.
    Fedosseev, V.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Petrarca, M.
    Production of long bunch trains with 4.5 μC total charge using a photoinjector2012In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 15Article in journal (Refereed)
  • 16.
    Olvegard, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden..
    Barnes, M. J.
    CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland..
    Ducimetiere, L.
    CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland..
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Time-resolved momentum and beam size diagnostics for bunch trains with very large momentum spread2015In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 797, p. 234-246Article in journal (Refereed)
    Abstract [en]

    We propose a novel method to measure he Lime -resolved momentum dislribulion and size of beams with very large momentum spread. To demonstrate the principle we apply the method to the beam at the end of a Compact Linear Collider decelerator, where conventional diagnostic methods are hampered by the large energy spread of the drive beam after up to 90% of its kinetic energy is converted into microwave power. Our method is based on sweeping the beam in a circular pattern to determine the momentum distribution and recording the beam size on a screen using optical transition radiation. We present an algorithm to extract the time-resolved momentum distribution. Furthermore, the beam size along the bunch train can be extracted from the image left On a screen by sweeping the beam linearly. We introduce he analysis technique and show simulation results that allow us to estimate the applicability, in addition, we present a conceptual design of the technical realization.

  • 17.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    A Pion Collector Based on Superconducting Solenoids: A Feasibility Study for the ESSnuSB2016Report (Other academic)
    Abstract [en]

    The European Spallation Sour e Neutrino Super-Beam project (ESSnuSB) plans to use the powerful proton beam from the ESS linac to produce a neutrino super beam in a dedicated target. The super beam must  consist of either muon neutrinos or muon antineutrinos and be directed towards an underground detector 540 km from the source. A neutrino horn based on a magnetic toroid is normally employed for colle ting the pions that emerge from the target and soon after emit neutrinos as they decay. However, the horn cannot accept the nominal pulse from the linac due to ohmic heating from the high current driving the structure. As an alternative, we have studied the use of solenoids for pion colle tion. The solenoids, that would be made superconducting for continuous operation, are however blind to the pion charge wherefore a charge separation stage is needed. This report describes our efforts of combining solenoid and dipole fields in order to collect pions from the target and separate the pion charges before they have time to decay. The study indicates that focusing with solenoids is possible, but that simultaneous charge separation can only be achieved with limited efficiency and acceptance in terms of pion divergence and momentum. Further studies are required for full understanding of the limitations.

  • 18.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Emittance and Energy Diagnostics for Electron Beams with Large Momentum Spread2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Following the discovery of the Higgs-like boson at the Large Hadron Collider, there is demand for precision measurements on recent findings. The Compact Linear Collider, CLIC, is a candidate for a future linear electron-positron collider for such precision measurements. In CLIC, the beams will be brought to collisions in the multi-TeV regime through high gradient acceleration with high frequency RF power. A high intensity electron beam, the so-called drive beam, will serve as the power source for the main beam, as the drive beam is decelerated in special structures, from which power is extracted and transfered to the main beam. When the drive beam is decelerated the beam quality deteriorates and the momentum spread increases, which makes the beam transport challenging. Dedicated diagnostics to monitor the momentum profile along each bunch train and transverse profile diagnostics will be needed to guarantee the reliability of the decelerator and consequently the power source of the main beam acceleration.

    A test facility, CTF3, has been constructed at CERN to validate key technical aspects of the CLIC concept. The beam quality in the decelerator will be investigated in the test beam line, TBL, where several power extraction structures reduce the drive beam energy by up to 55%. At the same time, the single-bunch rms energy spread grows from the initial value of 1% to almost 6%. To monitor the parameters of such a beam is challenging but crucial for the optimization of the beamline. In this thesis we report on progress made on adapting generally used methods for beam profile measurements to the demanding conditions of a wide momentum profile. Two detector technologies are used for measuring transverse profile and momentum profile and we discuss the performance of these instruments, in the view of the large momentum spread and with the outlook towards equivalent beam profile monitors in the CLIC decelerator.

  • 19.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Adli, E.
    Braun, H. H.
    Bravin, E.
    Chritin, N.
    Corsini, R.
    Dabrowski, A. E.
    Doebert, S.
    Dutriat, C.
    Egger, D.
    Lefevre, T.
    Mete, O.
    Skowronski, P. K.
    Tecker, F.
    High intensity profile monitor for time resolved spectrometry at the CLIC Test Facility 32012In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 683, p. 29-39Article in journal (Refereed)
    Abstract [en]

    The power source of the Compact Linear Collider (CLIC) relies on the generation and deceleration of a high-intensity electron drive beam. In order to provide the best radio-frequency (RF) to beam-energy transfer efficiency, the electron beam is accelerated using fully loaded RF cavities, which leads to strong beam loading effects resulting in a high-energy transient. The stability of the RF power produced by the drive beam depends on the stability of the drive beam energy and energy spread along the pulse. The control and the monitoring of the time evolution of the beam energy distribution are therefore crucial for the accelerator performance. For this purpose segmented beam dumps, which are simple and robust devices, have been designed and installed at the CLIC Test Facility 3 (CTF3). These devices are located at the end of spectrometer lines and provide horizontal beam profiles with a time resolution better than 10 ns. The segmented dumps are composed of parallel, vertical, metallic plates, and are based on the same principle as a Faraday cup: the impinging beam current is read by a fast acquisition channel. Both FLUKA and Geant4 simulations were performed to define the optimum detector geometry for beam energies ranging from 5 MeV to 150 MeV. This paper presents a detailed description of the different steps of the design: the optimization of the detector spatial resolution, the minimization of the thermal load and the long-term damage resulting from high radiation doses. Four segmented dumps are currently used in the CTF3 complex. Their measured performance and limitations are presented in this paper. Typical beam spectra as measured in the CTF3 linac are also presented along with a description of the RF manipulations needed for tuning the beam energy spectrum.

  • 20.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Adli, Erik
    University of Oslo, Norway.
    Andreazza, William
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Bolzon, Benoit
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Bravin, Enrico
    CERN, European Organization for Nuclear Research, Geneva, Schweiz.
    Chritin, Nicolas
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Dabrowski, Anne E.
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Döbert, Steffen
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Duraffourg, Michael
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Lefevre, T
    Lillestol, Reidar
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Beam profile monitoring at the test beam line at the Compact Linear Collider test facility2013In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 16, no 8, p. 082802-Article in journal (Refereed)
    Abstract [en]

    The Compact Linear Collider, CLIC is a study for a future linear electron-positron collider based on a two-beam acceleration scheme in which a high intensity drive beam is decelerated in order to provide the power to accelerate the main beam for collision in the TeV range. The power extracted from the drive beam deteriorates the beam quality and increases the energy spread significantly. Monitoring of the beam properties is therefore challenging but essential. These challenges are being addressed experimentally at the CLIC Test Facility where up to 55% of the power is extracted from the beam in the test beam line, TBL, a small-scale version of the CLIC drive beam decelerator, leaving the beam with a very wide energy profile. For monitoring of the transverse beam profile and Twiss parameters we use Optical Transition Radiation screens and quadrupole scans. The intra-pulse train energy spectrum before and after deceleration is measured with segmented beam dumps. In this report we discuss the performance of these diagnostic devices with a particular emphasis on the large energy spread and its effect on the beam imaging techniques, and with a final outlook to the CLIC drive beam diagnostics.

  • 21.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Adli, Erik
    University of Oslo.
    Andreazza, William
    Bolzon, Benoit
    Bravin, Enrico
    Chritin, Nicolas
    Dabrowski, Anne E.
    Döbert, Steffen
    Duraffourg, Michel
    Lefèvre, Thibaut
    Lillestol, Reidar
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Beam Profile Monitoring at the test beam line at the Compact Linear Collider test facility2013In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 16, no 8, article id 082802Article in journal (Refereed)
  • 22.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Andreazza, William
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Bravin, Enrico
    CERN, European Organization for Nuclear Research, Geneva, Schweiz.
    Chritin, Nicolas
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Dabrowski, Anne E.
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Duraffourg, Michel
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    Lefèvre, Thibaut
    CERN, European Organization for Nuclear Research, Geneva, Switzerland.
    A Segmented Beam Dump for the CTS Line at CTF32012Report (Other academic)
    Abstract [en]

    We propose a new segmented beam dump to be installed in thespectrometer line at the end of the CTF3 linac. The device will allowfor time-resolved energy distribution measurements in a single shotand would therefore be a useful tool in tuning the accelerator.

  • 23.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Bhattacharyya, Anirban
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Dancila, Dragos
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Eriksson, Johan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Fransson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Gajewski, Konrad
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Goryashko, Vitaliy
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hermansson, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Holz, Michael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jacewicz, Marek
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jobs, Magnus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Jönsson, Åke
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Li, Han
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Lofnes, Tor
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Nicander, Harald
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Rydberg, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Santiago Kern, Rocio
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Wedberg, Rolf
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Yogi, Ruthambara
    European Spallation Source.
    PROGRESS AT THE FREIA LABORATORY2015In: Proceedings of IPAC'15, JACoW: The Joint Accelerator Conferences Website , 2015Conference paper (Refereed)
    Abstract [en]

    The FREIA Facility for Research Instrumentation and Accelerator Development at Uppsala University, Sweden, has reached the stage where the testing of superconducting cavities for the European Spallation Source (ESS) is starting. The new helium liquefaction plant has been commissioned and now supplies a custom-made, versatile horizontal cryostat, HNOSS, with liquid helium at up to 140 l/h. The cryostat has been designed and built to house up to two accelerating cavities, or, later on, other superconducting equipment such as magnets or crab cavities. A prototype cavity for the spoke section of the ESS linac will arrive mid 2015 for high-power testing in the horizontal cryostat. Two tetrode-based commercial RF power stations will deliver 400 kW peak power each, at 352 MHz, to the cavity through an RF distribution line developed at FREIA. In addition, significant progress has been made with in-house development of solid state amplifier modules and powercombiners for future use in particle accelerators. We report here on these and other ongoing activities at the FREIA laboratory.

  • 24. Olvegård, Maja
    et al.
    Bolzon, B.
    Bravin, E.
    Burger, S.
    Dabrowski, A.
    Lefèvre, T.
    Welsch, C. P.
    Performance of Parabolic and Diffusive OTR Screens at the CLIC Test Facility 32011In: Proceedings of DIPAC2011, Hamburg, Germany, 2011, p. 413-415Conference paper (Other academic)
  • 25.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Bravin, E.
    Carra, F.
    Chritin, N.
    Dabrowski, A.
    Dallocchio, A.
    Döbert, S.
    Lefèvre, T.
    Adli, E.
    Spectrometry in the Test Beam Line at CTF32010In: Proceedings of IPAC€™10, Kyoto, Japan, 2010, p. 1113-1115Conference paper (Refereed)
  • 26. Olvegård, Maja
    et al.
    Dabrowski, A.
    Lefèvre, T.
    Döbert, S.
    Adli, E.
    Time Resolved Spectrometry on the Test Beam Line at CTF32009In: Proceedings of the 9th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, 2009, p. 257-259Conference paper (Other academic)
  • 27.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Benedetto, Elena
    European Organization for Nuclear Research - CERN.
    Cieslak-Kowalska, Magdalena
    European Organization for Nuclear Research - CERN.
    Martini, Michel
    European Organization for Nuclear Reasearch - CERN.
    Schönauer, Horst
    European Organization for Nuclear Reasearch - CERN.
    Wildner, Elena
    European Organization for Nuclear Reasearch - CERN.
    Overview Of The ESSnuSB Accumulator Ring2016In: Proceedings of the 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity, High Brightness and High Power Hadron Beams / [ed] Mohammad Eshraqi (ESS), Garry Trahern (ESS), Volker RW Schaa (GSI), 2016, p. 105-109, article id MOPR021Conference paper (Other academic)
    Abstract [en]

    The European Spallation Source (ESS) is a research center based on the world's most powerful proton driver, 2.0 GeV, 5 MW on target, currently under construction in Lund. With an increased pulse frequency, the ESS linac could deliver additional beam pulses to a neutrino target, thus giving an excellent opportunity to produce a high-performance ESS neutrino Super-Beam (ESSnuSB). The focusing system surrounding the neutrino target requires short pulses. An accumulator ring and acceleration of an H- beam in the linac for charge-exchange injection into the accumulator could provide such short pulses. In this paper we present an overview of the work with optimizing the accumulator design and the challenges of injecting and storing 1.1E15 protons per pulse from the linac. In particular, particle tracking simulations with space charge will be described.

  • 28.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Koutchouk, Jean-Pierre
    CERN.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    ON THE SUITABILITY OF A SOLENOID HORN FOR THE ESS NEUTRINO SUPERBEAM2015In: Proceedings of IPAC'15, JACoW , 2015Conference paper (Other academic)
    Abstract [en]

    The European Spallation Source (ESS), now under construction in Lund, Sweden, offers unique opportunities for experimental physics, not only in neutron science but potentially in particle physics. The ESS neutrino superbeam project plans to use a 5 MW proton beam from the ESS linac to generate a high intensity neutrino superbeam, with the final goal of detecting leptonic CP-violation in an underground megaton Cherenkov water detector. The neutrino production requires a second target station and a complex focusing system for the pions emerging from the target. The normal-conducting magnetic horns that are normally used for these applications cannot accept the 2.86 ms long proton pulses of the ESS linac, which means that pulse shortening in an accumulator ring would be required. That, in turn, requires H- operation in the linac to accommodate the high intensity. As an attractive alternative, we investigate the possibility of using superconducting solenoids for the pion focusing. This solenoid horn system needs to also separate positive and negative pion charge as completely as possible, in order to generate separately neutrino and anti-neutrino beams. We present here progress in the study of such a solenoid horn.

  • 29.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Conceptual design of the post-PETS instrumentation line for CLIC2013Manuscript (preprint) (Other academic)
    Abstract [en]

    We propose a method to measure the time-resolved momentum distribution and beam size at the end of the decelerator in the drive beam complex of the Compact Linear Collider, CLIC. Conventional diagnostic methods are hampered by the very high beam power and large energy spread of the drive beam after up to 90% of its kinetic energy is converted into microwave power. Our method is based on sweeping the beam in a circular pattern to determine the momentum distribution and recording the beam size on a screen using optical transition radiation. We present an algorithm to extract the time-resolved momentum distribution. Furthermore, qualitative information about the beam size along the pulse train can be extracted from the image left on a screen by sweeping the beam linearly. We present simulation results that allow us to estimate the applicability.

  • 30.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Effect of large momentum spread on emittance measurements2013In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 707, p. 114-119Article in journal (Refereed)
    Abstract [en]

    We discuss the systematic errors in emittance measurements with quadrupole scans and four screens due to large momentum spread in the beam. This is particularly relevant in the drive beam complex of CLIC and the test beam line TBL in the CTF3 facility at CERN. We also discuss methods to adapt the model to correct for the systematic errors.

  • 31.
    Olvegård, Maja
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ziemann, Volker
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Emittance and Momentum Diagnostics for Beams with Large Momentum Spread2013In: Proceedings of the International Beam Instrumentation Conference IBIC2013, 2013, p. -40Conference paper (Other academic)
    Abstract [en]

    Commonly used beam diagnostic methods, such as spectrometry or emittance measurements through quadrupolescans, are based on the assumption that the beam momentum spread is very small. This assumption is sometimes notfulfilled, which leads to a systematic misinterpretation ofthe measurement. We have studied this effect and presentalgorithms that consider the full momentum distributionand offer correct ways of analyzing the profile measurements.

  • 32. Skowronski, Piotr
    et al.
    Barranco, J.
    Bettoni, S.
    Corisni, R.
    Divall Csatari, M.
    Dabrowski, A.E.
    Doebert, S.
    Dubrovskiy, A.
    Kononenko, O.
    Lillestol, R.L
    Olvegård, Maja
    Persson, T.
    Rabiller, A.
    Tecker, F.
    Adli, E.
    Muranaka, Tomoko
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Palaia, Andrea
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    The CLIC Feasibility Demonstration in CTF32011In: Proceedings of IPAC2011, 2011, p. -1044Conference paper (Refereed)
  • 33.
    Wildner, Elena
    et al.
    European Organization for Nuclear Reasearch - CERN.
    Baussan, Eric
    IPHC, Université de Strasbourg, CNRS/IN2P3.
    Blennow, M.
    KTH Royal Institute of Technology.
    Bogomilov, M.
    University of Sofia.
    Burgman, Alexander
    Lund Univ, Dept Phys, POB 118, S-22100 Lund, Sweden.
    Bouquerel, Elian
    IPHC, Université de Strasbourg, CNRS/IN2P3.
    Carlile, Colin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. European Spallation Source.
    Cederkäll, Joakim
    Lund Univ, Dept Phys, POB 118, S-22100 Lund, Sweden.
    Peder, Christiansen
    Lund Univ, Dept Phys, POB 118, S-22100 Lund, Sweden.
    Cupial, Piotr
    AGH University of Science and Technology, Krakow.
    Danered, Håkan
    European Spallation Source.
    Dracos, Marcos
    IPHC, Université de Strasbourg, CNRS/IN2P3.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Eshraqi, Mohamad
    European Spallation Source.
    Hall-Wilton, R.
    ESS ERIC, European Spallat Source, POB 176, S-22100 Lund, Sweden.
    Lindroos, Mats
    European Spallation Source.
    Koutchouk, Jean-Pierre
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Martini, Michel
    European Organization for Nuclear Reasearch - CERN.
    Matev, R.
    Sofia Univ St Kliment Ohridski, Dept Atom Phys, Sofia 1164, Bulgaria.
    McGinnis, D.
    European Spallation Source.
    Miyamoto, Ryoichi
    European Spallation Source.
    Ohlsson, Tommy
    KTH, Royal Institute of Technology.
    Öhman, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy. Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Schönauer, Horst
    European Organization for Nuclear Reasearch - CERN.
    Tang, J. Y.
    Tsenov, R.
    Sofia Univ St Kliment Ohridski, Dept Atom Phys, Sofia 1164, Bulgaria.
    Vankova-Kirilova, Galina
    Sofia Univ St Kliment Ohridski, Dept Atom Phys, Sofia 1164, Bulgaria.
    Vassilopoulos, N.
    Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
    The Opportunity Offered by the ESSnuSB Project to Exploit the Larger Leptonic CP Violation Signal at the Second OscillationMaximum and the Requirements of This Project on the ESSAccelerator Complex2016In: Advances in High Energy Physics, ISSN 1687-7357, E-ISSN 1687-7365, article id 8640493Article in journal (Refereed)
    Abstract [en]

    The European Spallation Source (ESS), currently under construction in Lund, Sweden, is a research center that will provide, by 2023, the world's most powerful neutron source. The average power of the proton linac will be 5 MW. Pulsing this linac at higher frequency will make it possible to raise the average total beam power to 10 MW to produce, in parallel with the spallation neutron production, a very intense neutrino Super Beam of about 0.4 GeV mean neutrino energy. This will allow searching for leptonic CP violation at the second oscillation maximum where the sensitivity is about 3 times higher than at the first. The ESS neutrino Super Beam, ESSnuSB operated with a 2.0 GeV linac proton beam, together with a large undergroundWater Cherenkov detector located at 540 km from Lund, will make it possible to discover leptonic CP violation at 5 sigma. significance level in 56% (65% for an upgrade to 2.5 GeV beam energy) of the leptonic CP-violating phase range after 10 years of data taking, assuming a 5% systematic error in the neutrino flux and 10% in the neutrino cross section. The paper presents the outstanding physics reach possible for CP violation with ESSnuSB obtainable under these assumptions for the systematic errors. It also describes the upgrade of the ESS accelerator complex required for ESSnuSB.

  • 34.
    Wildner, Elena
    et al.
    European Organization for Nuclear Reasearch - CERN.
    Holzer, Bernard
    European Organization for Nuclear Reasearch - CERN.
    Martini, Michel
    European Organization for Nuclear Reasearch - CERN.
    Papaphilippou, Yannis
    European Organization for Nuclear Reasearch - CERN.
    Schönauer, Horst
    European Organization for Nuclear Reasearch - CERN.
    Eshraqi, Mohammad
    European Spallation Source.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Olvegård, Maja
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Ruber, Roger
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    THE ACCUMULATOR OF THE ESSnuSB FOR NEUTRINO PRODUCTION2015In: Proceedings of IPAC'15, Richmond, VA, USA, JACoW , 2015Conference paper (Other academic)
    Abstract [en]

    The European Spallation Source (ESS) is a research center based on the world’s most powerful neutron source currently under construction in Lund, Sweden. 2.0 GeV, 2.86 ms long proton pulses at 14 Hz are produced for the spallation facility (5MW on target). The possibility to pulse the linac at higher frequency to deliver, in parallel with the spallation neutron production, a very intense, cost effective and high performance neutrino beam. Short pulses on the target require an accumulator ring. The optimization of the accumulator lattice to store these high intensity beams from the linac (1.1E15 protons per pulse) has to take into account the space available on the ESS site, transport of H− beams (charge exchange injection), radiation and shielding needs. Space must be available in the ring for collimation and an RF system for the extraction gap and loss control. We present the status of the accumulator for the ESS neutrino facility.

1 - 34 of 34
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf