Dark Current and X Ray Measurements of an 805 MHz Pillbox Cavity
The muon cooling systems proposed for neutrino factories require low frequency (201 MHz) RF cavities with Be windows, at high gradient (Eacc {approx} 16 MV/m), in strong solenoidal magnetic field ({approx} 5 T). For the proposed Muon Ionization Cooling Experiment (MICE) [1], an experimental demonstration of cooling, we have an additional constraint that we must operate sensitive particle detectors very close to the RF cavities, which produce backgrounds from dark currents and x rays. To understand the processes involved in cavity conditioning and operation near particle detectors, we have constructed a test facility at Lab G of Fermilab, where a 5 Tesla superconducting solenoid, a 14 MW peak power klystron and a pillbox test cavity at 805 MHz are available. We present measurements of dark currents, x rays and surface structure from the pillbox cavity, with both copper and beryllium endplates, and discuss the interaction between surface structure and radiation backgrounds produced.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Lab., IL (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 825733
- Report Number(s):
- JLAB-ACC-03-10; DOE/ER/40150-2808; TRN: US0402590
- Resource Relation:
- Conference: PAC 2003, Portland, OR (US), 05/12/2003; Other Information: PBD: 1 May 2003
- Country of Publication:
- United States
- Language:
- English
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RF Tests of an 805 MHz Pillbox Cavity at Lab G of Fermilab
RF tests of an 805 MHz pillbox cavity at Lab G of Fermilab