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Title: High Power Co-Axial SRF Coupler

Abstract

There are over 35 coupler designs for SRF cavities ranging in frequency from 325 to 1500 MHz. Two-thirds of these designs are coaxial couplers using disk or cylindrical ceramics in various combinations and configurations. While it is well known that dielectric losses go down by several orders of magnitude at cryogenic temperatures, it not well known that the thermal conductivity also goes down, and it is the ratio of thermal conductivity to loss tangent (SRF ceramic Quality Factor) and ceramic volume which will determine the heat load of any given design. We describe a novel robust co-axial SRF coupler design which uses compressed window technology. This technology will allow the use of highly thermally conductive materials for cryogenic windows. The mechanical designs will fit into standard-sized ConFlat® flanges for ease of assembly. Two windows will be used in a coaxial line. The distance between the windows is adjusted to cancel their reflections so that the same window can be used in many different applications at various frequencies.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1021885
Report Number(s):
JLAB-ACC-09-1134; DOE/ER/40150-4953
FG02-08ER85171; TRN: US201117%%463
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: PAC09, 4-8 May 2009, Vancouver, BC, Canada
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CAVITIES; CERAMICS; CRYOGENICS; DESIGN; DIELECTRIC MATERIALS; FLANGES; QUALITY FACTOR; THERMAL CONDUCTIVITY; WINDOWS

Citation Formats

M.L. Neubauer, R.A. Rimmer. High Power Co-Axial SRF Coupler. United States: N. p., 2009. Web.
M.L. Neubauer, R.A. Rimmer. High Power Co-Axial SRF Coupler. United States.
M.L. Neubauer, R.A. Rimmer. 2009. "High Power Co-Axial SRF Coupler". United States. https://www.osti.gov/servlets/purl/1021885.
@article{osti_1021885,
title = {High Power Co-Axial SRF Coupler},
author = {M.L. Neubauer, R.A. Rimmer},
abstractNote = {There are over 35 coupler designs for SRF cavities ranging in frequency from 325 to 1500 MHz. Two-thirds of these designs are coaxial couplers using disk or cylindrical ceramics in various combinations and configurations. While it is well known that dielectric losses go down by several orders of magnitude at cryogenic temperatures, it not well known that the thermal conductivity also goes down, and it is the ratio of thermal conductivity to loss tangent (SRF ceramic Quality Factor) and ceramic volume which will determine the heat load of any given design. We describe a novel robust co-axial SRF coupler design which uses compressed window technology. This technology will allow the use of highly thermally conductive materials for cryogenic windows. The mechanical designs will fit into standard-sized ConFlat® flanges for ease of assembly. Two windows will be used in a coaxial line. The distance between the windows is adjusted to cancel their reflections so that the same window can be used in many different applications at various frequencies.},
doi = {},
url = {https://www.osti.gov/biblio/1021885}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 01 00:00:00 EDT 2009},
month = {Fri May 01 00:00:00 EDT 2009}
}

Conference:
Other availability
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