Author :
Ciovati, G. ; Kneisel, P. ; Brawley, J. ; Bundy, R. ; Campisi, I. ; Davis, K. ; Macha, K. ; Machie, D. ; Mammosser, J. ; Morgan, S. ; Sundelin, R. ; Turlington, L. ; Wilson, K. ; Doleans, M. ; Kim, S.H. ; Mangra, D. ; Barni, D. ; Pagani, C. ; Pierini, P.
Abstract :
The Spallation Neutron Source project includes a superconducting linac section in the energy range from 186 MeV to 1000 MeV. For this energy range two types of cavities are needed with geometrical β values of β=0.61 and β=0.81. An aggressive cavity prototyping program is being pursued at Jefferson Lab, which calls for fabricating and testing four β=0.61 cavities and two β=0.81 cavities. Both types consist of six cells made from high purity niobium and feature one HOM coupler of the TESLA type on each beam pipe and a port for a high power coaxial input coupler. Three of the four β=0.61 cavities will be used for a cryomodule test at the end of 2001. Two cavities of each type have been fabricated and the first tests on both cavities exceeded the design values for gradient and Q value: Eacc=10.1 MV/m and Q=5×109 at 2.1 K for the β=0.61 and Eacc =12.5 MV/m and Q=5×109 at 2.1 K for the β=0.81
Keywords :
accelerator cavities; linear accelerators; proton accelerators; superconducting cavity resonators; 186 to 1000 MeV; HOM coupler; SNS; Spallation Neutron Source; cryomodule test; electromagnetic design; high power coaxial input coupler; superconducting linac section; superconducting prototype cavities; Coaxial components; Flexible printed circuits; Linear particle accelerator; Neutrons; Niobium; Optical coupling; Prototypes; Superconducting devices; Testing; Welding;
