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Dark currents studies with the Uppsala X-band Spectrometer at XBox test stand at CERN
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, FREIA. (Accelerator Physics)
2019 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

Vacuum arcs is the phenomenon which limits the performance of normal conducting acceleratorcavities. It closely depends on electron field emission, which is consider a precursor for the creationof a vacuum discharge. These processes are still not fully understood, but we know that theydepend on the physical properties of the surfaces and bulk materials used in the acceleratorstructures. We need to come at these problems with a multidisciplinary approach, comprisingaccelerator, material and surface physics, for both experimental and theoretical analysis.The field emission current emitted during operation of the RF cavity is typically refer to as thedark current. Behavior of the dark current can give useful information about changes inside thestructure during conditioning and thus into the physics of the vacuum arcs. The Uppsala groupuses a magnetic spectrometer to look at the changes, both spatially on the screen and by measuringthe energy spectrum of the escaping electrons during conditioning of CLIC X-band structuresin dedicated high-power RF test stand at CERN. The spectrometer was originally designedto measure the electrons from the breakdown events with much higher intensities than the darkcurrent signals. In this paper we present the attempt to measure the dark current with the samesetup.

Ort, förlag, år, upplaga, sidor
2019. , s. 7
Serie
FREIA Report ; 2019/04
Nationell ämneskategori
Acceleratorfysik och instrumentering
Identifikatorer
URN: urn:nbn:se:uu:diva-392193OAI: oai:DiVA.org:uu-392193DiVA, id: diva2:1347278
Tillgänglig från: 2019-08-30 Skapad: 2019-08-30 Senast uppdaterad: 2019-09-03Bibliografiskt granskad

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