TY - GEN
T1 - Large-volume resonant microwave discharge for plasma cleaning of a cebaf 5-cell SRFcavity
AU - Mammosser, J.
AU - Ahmed, S.
AU - Macha, K.
AU - Upadhyay, J.
AU - Nikolic, M.
AU - Popovic, S.
AU - Vuškovic, L.
PY - 2012
Y1 - 2012
N2 - We report the preliminary results on plasma generation in a 5-cell CEBAFsuperconducting radio-frequency (SRF) cavity for the application of cavity interior surfacecleaning. CEBAF currently has ~300 of these five cell cavities installed in the JeffersonLab accelerator which are mostly limited by cavity surface contamination. The developmentof an in-situ cavity surface cleaning method utilizing a resonant microwave discharge couldlead to significant CEBAF accelerator performance improvement. This microwave discharge iscurrently being used for set of plasma cleaning procedures targeted to the removal ofvarious organic, metal and metal oxide impurities. These contaminants are responsible forthe increase of surface resistance and the reduction of RF performance in installedcavities. CEBAF cavity has a cylindrical symmetry, but its elliptical shape and transversalpower coupling makes it an unusual plasma application, which requires special considerationof microwave breakdown. Our preliminary study includes microwave breakdown and opticalspectroscopy, which was used to define the operating pressure range and the rate of removalof organic impurities.
AB - We report the preliminary results on plasma generation in a 5-cell CEBAFsuperconducting radio-frequency (SRF) cavity for the application of cavity interior surfacecleaning. CEBAF currently has ~300 of these five cell cavities installed in the JeffersonLab accelerator which are mostly limited by cavity surface contamination. The developmentof an in-situ cavity surface cleaning method utilizing a resonant microwave discharge couldlead to significant CEBAF accelerator performance improvement. This microwave discharge iscurrently being used for set of plasma cleaning procedures targeted to the removal ofvarious organic, metal and metal oxide impurities. These contaminants are responsible forthe increase of surface resistance and the reduction of RF performance in installedcavities. CEBAF cavity has a cylindrical symmetry, but its elliptical shape and transversalpower coupling makes it an unusual plasma application, which requires special considerationof microwave breakdown. Our preliminary study includes microwave breakdown and opticalspectroscopy, which was used to define the operating pressure range and the rate of removalof organic impurities.
UR - http://www.scopus.com/inward/record.url?scp=84885651862&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84885651862
SN - 9783954501151
T3 - IPAC 2012 - International Particle Accelerator Conference 2012
SP - 3156
EP - 3158
BT - IPAC 2012 - International Particle Accelerator Conference 2012
T2 - 3rd International Particle Accelerator Conference 2012, IPAC 2012
Y2 - 20 May 2012 through 25 May 2012
ER -