TY - GEN
T1 - Temperature dependent microphonics in the BNL electron cooler
AU - Jain, Puneet
AU - Ben-Zvi, Ilan
AU - Schultheiss, Carl
PY - 2011
Y1 - 2011
N2 - An R&D Energy Recovery Linac (ERL), to be used in the BNL electron cooler, has been operational in a developmental setting. The ERL requires a cryogenic system to supply cooling to a superconducting RF gun and the 5-cell superconducting RF cavity system that is kept cold at 2K. The 2K superfluid bath is produced by pumping on the bath using a sub-atmospheric warm compression system. During a test run in October 2010, a resonance peak corresponding to a noise of 30 Hz was observed. This noise peak, present at all temperatures below 2K, is assumed to be of mechanical origin from the vibration of the cryopump. Another resonance noise at 16 Hz, which is characteristic of the system, was observed to shift towards the resonance at 30 Hz. The resonance noise at 16 Hz upon hitting the resonance noise at 30 Hz sets a resonance condition, thereby getting amplified by more than five times. In this paper we explore the source that causes a continuous shift in the resonance noise at 16 Hz towards the higher side until it hits the resonance noise at 30 Hz and give a physical explanation of the resonance.
AB - An R&D Energy Recovery Linac (ERL), to be used in the BNL electron cooler, has been operational in a developmental setting. The ERL requires a cryogenic system to supply cooling to a superconducting RF gun and the 5-cell superconducting RF cavity system that is kept cold at 2K. The 2K superfluid bath is produced by pumping on the bath using a sub-atmospheric warm compression system. During a test run in October 2010, a resonance peak corresponding to a noise of 30 Hz was observed. This noise peak, present at all temperatures below 2K, is assumed to be of mechanical origin from the vibration of the cryopump. Another resonance noise at 16 Hz, which is characteristic of the system, was observed to shift towards the resonance at 30 Hz. The resonance noise at 16 Hz upon hitting the resonance noise at 30 Hz sets a resonance condition, thereby getting amplified by more than five times. In this paper we explore the source that causes a continuous shift in the resonance noise at 16 Hz towards the higher side until it hits the resonance noise at 30 Hz and give a physical explanation of the resonance.
UR - https://www.scopus.com/pages/publications/84885705207
M3 - Conference contribution
AN - SCOPUS:84885705207
SN - 9789290833666
T3 - IPAC 2011 - 2nd International Particle Accelerator Conference
SP - 370
EP - 372
BT - IPAC 2011 - 2nd International Particle Accelerator Conference
T2 - 2nd International Particle Accelerator Conference, IPAC 2011
Y2 - 4 September 2011 through 9 September 2011
ER -