805 MHz Beta = 0.47 Elliptical Accelerating Structure R & D

Bricker, S. ; Compton, C. ; Hartung, W. ; Johnson, M. ; Marti, F. ; Popierlarski, J. ; York, R. C. ; al, et

Michigan State University

关键词: Acceleration;    Velocity Cryomodule Development;    Tuning;    Cavities;    43 Particle Accelerators;   

DOI  :  10.2172/937509
RP-ID  :  DOE/FG/41247-1
RP-ID  :  FG02-03ER41247
RP-ID  :  937509

美国|英语

来源: UNT Digital Library

【 摘 要 】

A 6-cell 805 MHz superconducting cavity for acceleration in the velocity range of about 0.4 to 0.53 times the speed of light was designed. After single-cell prototyping, three 6-cell niobium cavities were fabricated. In vertical RF tests of the 6-cell cavities, the measured quality factors (Q{sub 0}) were between 7 {center_dot} 10{sup 9} and 1.4 {center_dot} 10{sup 10} at the design field (accelerating gradient of 8 to 10 MV/m). A rectangular cryomodule was designed to house 4 cavities per cryomodule. The 4-cavity cryomodule could be used for acceleration of ions in a linear accelerator, with focusing elements between the cryomodules. A prototype cryomodule was fabricated to test 2 cavities under realistic operating conditions. Two of the 6-cell cavities were equipped with helium tanks, tuners, and input coupler and installed into the cryomodule. The prototype cryomodule was used to verify alignment, electromagnetic performance, frequency tuning, cryogenic performance, low-level RF control, and control of microphonics.