TY - GEN
T1 - Superconducting radio frequency cavity degradation due to errant beam
AU - Peters, C.
AU - Aleksandrov, A.
AU - Blokland, W.
AU - Crofford, M.
AU - Curry, D.
AU - Deibele, C.
AU - Dodson, G.
AU - Galambos, J.
AU - Johns, G.
AU - Justice, A.
AU - Kim, S.
AU - Pelaia, T.
AU - Plum, M.
AU - Shishlo, A.
N1 - Publisher Copyright:
Copyright © 2015 CC-BY-3.0 and by the respective authors.
PY - 2015
Y1 - 2015
N2 - In 2009, the Superconducting Radio Frequency (SRF) cavities at the Spallation Neutron Source (SNS) began to experience significant operational degradation [1]. The source of the degradation was found to be repeated striking of cavity surfaces with errant beam pulses. The Machine Protection System (MPS) was designed to turn the beam off during a fault condition in less than 20 μseconds [2] as these errant beam pulses were not unexpected. Unfortunately an improperly operating MPS was not turning off the beam within the designed 20 μseconds, and the SRF cavities were being damaged. The MPS issues were corrected, and the SRF performance was restored with cavity thermal cycling and RF processing. However, the SRF cavity performance has continued to degrade, though at a reduced rate compared to 2009. This paper will detail further study of errant beam frequency, amount lost per event, causes, and the corrective actions imposed since the initial event.
AB - In 2009, the Superconducting Radio Frequency (SRF) cavities at the Spallation Neutron Source (SNS) began to experience significant operational degradation [1]. The source of the degradation was found to be repeated striking of cavity surfaces with errant beam pulses. The Machine Protection System (MPS) was designed to turn the beam off during a fault condition in less than 20 μseconds [2] as these errant beam pulses were not unexpected. Unfortunately an improperly operating MPS was not turning off the beam within the designed 20 μseconds, and the SRF cavities were being damaged. The MPS issues were corrected, and the SRF performance was restored with cavity thermal cycling and RF processing. However, the SRF cavity performance has continued to degrade, though at a reduced rate compared to 2009. This paper will detail further study of errant beam frequency, amount lost per event, causes, and the corrective actions imposed since the initial event.
UR - http://www.scopus.com/inward/record.url?scp=84970902097&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84970902097
T3 - 6th International Particle Accelerator Conference, IPAC 2015
SP - 805
EP - 807
BT - 6th International Particle Accelerator Conference, IPAC 2015
PB - Joint Accelerator Conferences Website (JACoW)
T2 - 6th International Particle Accelerator Conference, IPAC 2015
Y2 - 3 May 2015 through 8 May 2015
ER -