A Perpendicular Biased 2nd Harmonic Cavity for the Fermilab Booster

Conference · Mon Jul 13 00:00:00 EDT 2015

OSTI ID:1250507

Tan, C. Y.; Dey, J. ^[1]; Madrak, R. L. ^[1]; Pellico, W. ^[1]; Romanov, G. ^[1]; Sun, D. ^[1]; Terechkine, I. ^[1]

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1. Fermilab

A perpendicular biased 2nd harmonic cavity is currently being designed for the Fermilab Booster. Its purpose cavity is to flatten the bucket at injection and thus change the longitudinal beam distribution so that space charge effects are decreased. It can also with transition crossing. The reason for the choice of perpendicular biasing over parallel biasing is that the Q of the cavity is much higher and thus allows the accelerating voltage to be a factor of two higher than a similar parallel biased cavity. This cavity will also provide a higher accelerating voltage per meter than the present folded transmission line cavity. However, this type of cavity presents technical challenges that need to be addressed. The two major issues are cooling of the garnet material from the effects of the RF and the cavity itself from eddy current heating because of the 15 Hz bias field ramp. This paper will address the technical challenge of preventing the garnet from overheating.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1250507
• Report Number(s): FERMILAB-CONF-15-159-AD; 1405042
• Country of Publication: United States
• Language: English