Author :
Campisi, I.E. ; Assadi, S. ; Casagrande, F. ; Champion, M. ; Chu, P. ; Cousineau, S. ; Crofford, M. ; Deibele, C. ; Galambos, J.D. ; Gurd, P. ; Hatfield, D. ; Howell, M. ; Jeon, D. ; Kang, Y.W. ; Kasemir, K. ; Kursun, Z. ; Ma, H. ; Piller, M. ; Stout, D.
Author_Institution :
ORNL/SNS, Oak Ridge, TN 37831, U.S.A., cie@ornl.gov
Abstract :
The Spallation Neutron Source being built at Oak Ridge National Laboratory employs eighty one 805 MHz superconducting cavities operated at 2.1 K to accelerate the H-beam from 187 MeV to about 1 GeV. The superconducting cavities and cryomodules with two different values of beta (. 61 and .81) have been designed and constructed at Jefferson Lab for operation at 2.1 K with unloaded Q’s in excess of 5×109. To gain experience in testing cryomodules in the SNS tunnel before the final commissioning of the 2.1 K Central Helium Liquefier, integration tests are being conducted on the cryomodules at 4.2 K. This is the first time that a superconducting cavity system specifically designed for 2.1 K operation has been extensively tested at 4.2 K without superfluid helium.
