Implications of beam phase and RFSUM measured near transition

Yang, Xi ; MacLachlan, James

Fermi National Accelerator Laboratory

关键词: Rf Systems;    Phase Studies;    43 Particle Accelerators;    Beam Dynamics;    Performance;   

DOI  :  10.2172/822764
RP-ID  :  FERMILAB-TM-2238
RP-ID  :  AC02-76CH03000
RP-ID  :  822764

美国|英语

来源: UNT Digital Library

【 摘 要 】

Understanding the transition-crossing process is crucial for improving Booster performance at high intensity. The synchronous phase appears to drop toward 90{sup o} right after transition regardless of beam intensity, more so at higher beam intensity. The implication is that the effective rf voltage (RFSUM) will run into a limit right after transition when the synchronous phase reaches 90{sup o} for high intensity beam. A reduction in RFSUM is also observed at the same time. Solutions, such as raising the rf voltage during the transition period or controlling the RFSUM reduction by increasing longitudinal emittance before transition, are potentially important for high intensity operation.