The Tevatron Chromaticity tracker

Tan, Cheng-Yang

Fermi National Accelerator Laboratory

关键词: Betatrons;    43 Particle Accelerators;    Modulation Accelerators;    Accelerators;    Fermilab Tevatron;   

DOI  :  10.2172/946542
RP-ID  :  FERMILAB-TM-2422-AD
RP-ID  :  AC02-07CH11359
RP-ID  :  946542

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来源: UNT Digital Library

【 摘 要 】

The Tevatron chromaticity tracker (CT) has been successfully commissioned and is now operational. The basic idea behind the CT is that when the phase of the Tevatron RF is slowly modulated, the beam momentum is also modulated. This momentum modulation is coupled transversely via chromaticity to manifest as a phase modulation on the betatron tune. Thus by phase demodulating the betatron tune, the chromaticity can be recovered. However, for the phase demodulation to be successful, it is critical that the betatron tune be a coherent signal that can be easily picked up by a phase detector. This is easily done because the Tevatron has a phase locked loop (PLL) based tune tracker which coherently excites the beam at the betatron tune.