Fast Ferroelectric L-Band Tuner for Superconducting Cavities

Hirshfield, Jay L.

Omega-P, Inc.

关键词: Dielectric Materials;    Cavities;    43 Particle Accelerators;    36 Materials Science;    Fluctuations;   

RP-ID  :  DOE/ER84863-p59
RP-ID  :  FG02-07ER84863
RP-ID  :  1006494

美国|英语

来源: UNT Digital Library

【 摘 要 】

Analysis and modeling is presented for a fast microwave tuner to operate at 700 MHz which incorporates ferroelectric elements whose dielectric permittivity can be rapidly altered by application of an external voltage. This tuner could be used to correct unavoidable fluctuations in the resonant frequency of superconducting cavities in accelerator structures, thereby greatly reducing the RF power needed to drive the cavities. A planar test version of the tuner has been tested at low levels of RF power, but at 1300 MHz to minimize the physical size of the test structure. This test version comprises one-third of the final version. The tests show performance in good agreement with simulations, but with losses in the ferroelectric elements that are too large for practical use, and with issues in bonding of ferroelectric elements to the metal walls of the tuner structure.