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Beam profile monitoring at the test beam line at the Compact Linear Collider test facility
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
University of Oslo, Norway.
CERN, European Organization for Nuclear Research, Geneva, Switzerland.
CERN, European Organization for Nuclear Research, Geneva, Switzerland.
Show others and affiliations
2013 (English)In: Physical Review Special Topics. Accelerators and Beams, ISSN 1098-4402, E-ISSN 1098-4402, Vol. 16, no 8, 082802- p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2013. Vol. 16, no 8, 082802- p.
Keyword [en]
CLIC Test Facility, electron decelerator, optical transition radiation, quadrupole scan, segmented beam dump
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-197570DOI: 10.1103/PhysRevSTAB.16.082802ISI: 000323611000002OAI: oai:DiVA.org:uu-197570DiVA: diva2:614959
Projects
CLIC
Available from: 2013-04-08 Created: 2013-03-27 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Emittance and Energy Diagnostics for Electron Beams with Large Momentum Spread
Open this publication in new window or tab >>Emittance and Energy Diagnostics for Electron Beams with Large Momentum Spread
2013 (English)Doctoral 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.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 79 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1036
Keyword
beam instrumentation, particle beam diagnostic, emittance, particle collider, particle accelerator
National Category
Subatomic Physics
Research subject
High Energy Physics
Identifiers
urn:nbn:se:uu:diva-198080 (URN)978-91-554-8646-4 (ISBN)
Public defence
2013-05-24, Sal 2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Funder
EU, FP7, Seventh Framework Programme, PITN-GA-2008-215080-DITANET
Available from: 2013-05-03 Created: 2013-04-08 Last updated: 2013-08-30

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