Cryogenic Testing of the RF Input Waveguide for the CEBAF Upgrade Cryomodule

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In order to support the planned CEBAF upgrade at the Jefferson Lab a new cryomodule has been designed. A key component of the new cryomodule is the upgraded RF input waveguide, which may couple as much as 10 kW of Radio Frequency (RF) power to Superconducting Radio Frequency (SRF) cavities contained in a bath of superfluid helium. The coupler consists of a straight copper plated stainless steel waveguide as a thermal transition between 2K and 300K and one ceramic window at the warm end of the waveguide. The waveguide interior shares a common vacuum with the cavity. Initial testing of ... continued below

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254 Kilobytes pages

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Breth, M.; Drury, M.; Getz, R.; Hiatt, T.; Phillips, L.; Preble, J. et al. June 1, 2001.

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Description

In order to support the planned CEBAF upgrade at the Jefferson Lab a new cryomodule has been designed. A key component of the new cryomodule is the upgraded RF input waveguide, which may couple as much as 10 kW of Radio Frequency (RF) power to Superconducting Radio Frequency (SRF) cavities contained in a bath of superfluid helium. The coupler consists of a straight copper plated stainless steel waveguide as a thermal transition between 2K and 300K and one ceramic window at the warm end of the waveguide. The waveguide interior shares a common vacuum with the cavity. Initial testing of the upgraded coupler has been conducted at Jefferson Lab in a representative cryomodule. During testing, data was obtained regarding waveguide temperature profiles as well as coupler arcing and multipacting.Predicted temperature profiles were used to determine the optimum location of the 50K heat intercept on the waveguide, and were found to be comparable to the actual measured profiles.The coupler was found to be free of multipacting up to 1.7 kW. No arcing occurred during multiple eight-hour runs in heavy field emission with typical radiation levels of 0.5 to 1.0 R/hr outside the cryostat.

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254 Kilobytes pages

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  • PAC 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: JLAB-ACE-01-04
  • Report No.: DOE/ER/40150-1869
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 783616
  • Archival Resource Key: ark:/67531/metadc718810

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 7:58 p.m.

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Breth, M.; Drury, M.; Getz, R.; Hiatt, T.; Phillips, L.; Preble, J. et al. Cryogenic Testing of the RF Input Waveguide for the CEBAF Upgrade Cryomodule, article, June 1, 2001; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc718810/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.