The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Peters, C.C. AU - Aleksandrov, A.V. AU - Blokland, W. AU - Crofford, M.T. AU - Curry, D. AU - Deibele, C. AU - Dodson, G.W. AU - Galambos, J. AU - Johns, G.D. AU - Justice, T.A. AU - Kim, S.-H. AU - Pelaia II, T.A. AU - Plum, M.A. AU - Shishlo, A.P. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Superconducting Radio Frequency Cavity Degradation Due to Errant Beam J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english 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. PB - JACoW CP - Geneva, Switzerland SP - 805 EP - 807 KW - cavity KW - ion KW - ion-source KW - linac KW - vacuum DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-MOPHA013 UR - http://jacow.org/ipac2015/papers/mopha013.pdf ER -