First Cryogenic Tests with Jlab's New Upgrade cavities
Two types of 7-cell cavities have been developed for the upgrade of CEBAF to 12 GeV. The High Gradient type (HG) has been optimized with respect to the ratio of E{sub peak}/E{sub acc}. The Low Loss (LL) type has optimized shunt impedance and improved geometric factor. Each cavity type features four DESY-type coaxial Higher Order Mode (HOM) couplers and a waveguide input coupler. Design goals for these cavities have been set to E{sub acc} = 20 MV/m with an intrinsic Q{sub o} of 8 {center_dot} 10{sup 9} at 2.05 K. A niobium prototype of each cavity has been fabricated at JLab and both cavities have been evaluated at cryogenic temperatures after appropriate surface treatment. In addition, pressure sensitivity as well as Lorentz force detuning were evaluated. The damping of approximately 20 HOMs has been measured to verify the room temperature data. Several single cell cavities were tested in addition to multi cell cavities. We present in this contribution a summary of tests performed on the prototypes of the proposed cavities.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 827749
- Report Number(s):
- JLAB-ACC-04-258; DOE/ER/40150-2833; TRN: US0403601
- Resource Relation:
- Conference: 22nd International Linear Accelerator Conference (LINAC 2004), Lubeck (DE), 08/16/2004--08/20/2004; Other Information: PBD: 1 Aug 2004
- Country of Publication:
- United States
- Language:
- English
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