Speaker
Description
Two 1.5 GHz CEBAF C75-shape 5-cell accelerator cavities were coated with Nb3Sn film using the vapor diffusion technique at Fermilab and Jefferson Lab coating facilities. Both cavities were measured at 4 K and 2 K in the vertical dewar test in each lab, then assembled into a CEBAF quarter cryomodule at Jefferson Lab. The cryomodule was tested in 4 K and 2 K in the CryoModule Test Facility at Jefferson Lab. RF test results for both cavities in the cryomodule are similar to those of the qualification test in VTS, with one cavity reaching Eacc = 7.5 MV/m and the other - 13 MV/m at 4 K. In this contribution we discuss the progress with assembling Nb3Sn cavities in a cryomodule and the first results from cryomodule testing.
Funding Agency
DOE/ SC/ NP under contract DE-AC05-06OR23177 with Jefferson Science Associates, LC., DOE ECA to G. Eremeev, Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with the DOE/ SC/ HEP.
Footnotes
We would like to thank Alex Netepenko and Alex Melnychuk for help with cavity measurements, Damon Bice for cavity treatment coordination, Anna Grassellino, Alex Romanenko, Sergey Belomestnykh for their support. We also want to thank Danny Forehand, Chris Dreyfuss, Ashley Mitchell, Justin Kent, Peter Owen, and JLab technical staff for their help with preparing, assembling, and testing the cavities, and thank Rongli Geng and Anne-Marie Valente Feliciano for their support.
