200MHz superconducting RF cavity development for RLAs
نویسندگان
چکیده
Abstract. A 200MHz single-cell superconducting Nb-Cu cavity has been fabricated and tested at 4.2 K and at 2.5 K. The low field Q0 reached 1 5 1010 at 4.2 K. The accelerating gradient (Eacc) reached 11 MV/m at a Q0 of 6 108. Two multipacting barriers show up at Eacc = 3 and 1 MV/m. Helium processing is effective in reducing field emission and improving accelerating gradients. The Q-drop is observed with a much stronger field dependence as compared to what is expected. Results on the radiation background near the cavity and the external magnetic field effect on the Q of a cold cavity are also reported. Invited talk at the 5th International Workshop on Neutrino Factories and Superbeams, Columbia University, New York, June 5-11, 2003. SRF030702-16
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