Electro-Mechanical Properties of Spoke-Loaded Superconducting Cavities
This paper presents experimental data characterizing the electro-mechanical properties of superconducting spoke-loaded cavities developed for high-intensity ion-linac applications, such as the cw ANL Advanced Exotic Beams Laboratory (AEBL) driver linac and the pulsed FNAL High Intensity Neutrino Source (HINS, now project X) proton driver linac. High-gradient cw operation at 4.2 K can produce violent boiling in the liquid helium coolant causing microphonic frequency noise. A spoke cavity designed to minimize the effects of helium pressure on RF eigenfrequency, the total microphonic induced RF frequency variations, were found to be on the level of the phase noise in the reference oscillator. To determine the pulsed cavity RF performance, the Lorentz transfer function was measured and used to predict the dynamic detuning in pulsed operation. There is good agreement between the predicted fit and the measured data, demonstrating the utility of the Lorentz transfer function, which can compl
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-060R23177
- OSTI ID:
- 955806
- Report Number(s):
- JLAB-ACC-07-772; DOE/OR/23177-0553; TRN: US1004750
- Resource Relation:
- Conference: Paper compiled for SRF 2007
- Country of Publication:
- United States
- Language:
- English
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Electro-Mechanical Properties of Spoke-Loaded Superconducting Cavities
Tests of a tuner for a 325 MHz SRF spoke resonator