NSLS-II 500 MHz Upstream Superconducting Cavity Commissioning

Technical Report · Tue Aug 19 00:00:00 EDT 2014

DOI:https://doi.org/10.2172/1505096· OSTI ID:1505096

Gao, Feng ^[1]; Ravindranath, Vishy ^[1]; Rose, James ^[1]; Cupolo, John ^[1]; McDonald, Keith ^[1]; Sikora, Bob ^[1]; Dilgen, Thomas ^[1]; Gash, Bill ^[1]; Papu, Joseph ^[1]; Davila, Peter ^[1]; Sorrentino, Christopher ^[1]; Milidantri, Domenick ^[1]; Oliva, Jorge ^[1]; Holub, Brian ^[1]; Tagger, Jueri ^[1]; Ramirez, Gloria ^[1]; Kulpin, John ^[1]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Directorate

The NSLS-II Storage Ring RF system was designed to be equipped with up to four CESR-B type 500MHz niobium superconducting cavities. The first one has been installed and commissioned with beam at the upstream location of Cell 24 RF straight. Prior to tunnel installation, cryogenic and RF tests had been performed in the blockhouse to ensure that the cavity could provide enough energy gain for electron beam current of 25 mA for commissioning, and up to ~300 mA for early operation depending upon the total energy loss per turn at that time. After the blockhouse test, the cavity was installed in the storage ring tunnel, where it was then cooled down, conditioned, and finally commissioned with up to 50 mA of beam current. The NSLS-II LHe Cryogenic Plant was used to maintain the cavity temperature at 4.5K. The blockhouse interfaces with the cryogenic manifold box via a vacuum jacketed line, while in the tunnel the cryomodule is fed by a valvebox which is supplied by the same manifold box. The helium gas is recovered by the close-loop LHe system, and the nitrogen gas is vented outside of the RF building through a vent line. This report contains three parts describes cryogenic and RF tests in the blockhouse and cavity commissioning in the tunnel. Within the sections, the cryogenic operation is introduced first then the RF test is described. Section 5 describes further studies proposed for the next operation period.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: SC0012704
• OSTI ID: 1505096
• Report Number(s): NSLSII-ASD-TN-151; BNL-211131-2019-TECH
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE