HIGH POWER CO-AXIAL COUPLERS FOR SRF CAVITIES

Conference · Tue Jul 01 00:00:00 EDT 2014

DOI:https://doi.org/10.18429/JACoW-IPAC2014-WEPRI072· OSTI ID:1968793

Guo, J. ^[1]; Rimmer, R. ^[1]; Williams, S. ^[1]; Henry, J. ^[1]; Wang, H. ^[1]; Neubauer, M. ^[2]; Dudas, A. ^[2]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Muons, Inc., Batavia, IL (United States)

High Power RF couplers are required in a wide range of accelerator projects using superconducting RF cavities. There are a number of coupler designs for different SRF cavities, with various coupler window shapes. A majority of the SRF cavities adopt dual window design, partly due to the concern of reliability. We have proposed a novel robust coax dual window SRF coupler design using two pre-stressed disc windows. The matching at certain frequency is achieved by choosing the window spacing so that the RF reflected from both windows will cancel each other, without the need of additional matching elements. We have fabricated such a dual window assembly with the dimensions of the EIA 3-1/8 50 ? coax line. Larger sizes can be used if higher power handling capacity is desired. The assembly were originally designed to match at 400 MHz. Low power tests showed good agreement with the design. Without active cooling, the assembly was tested with traveling wave and standing wave up to 12 kW CW at 1.5 GHz with matching irises. In this paper, we will present our latest progress in the fabrication and testing of the windows.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1968793
• Report Number(s): JLAB-ACC-14-1926; DOE/OR/23177-3141
• Country of Publication: United States
• Language: English