| |
Construction of STF (Superconducting RF Test Facility) is being carried out at KEK. Four-cavity system including 9-cell baseline cavities (TESLA-type), input couplers and frequency tuners has been developed and will be installed in a 6 m cryomodule. The peculiarity of the STF baseline cavity system is a very stiff design in a jacket and tuner system, which can relax the effect of Lorentz detuning in a pulsed operation. Performance tests of four 9-cell cavities have been carried out repeatedly in a vertical cryostat, and the attained accelerating gradients reached to about 20 MV/m with no field emission in each cavity. High power input couplers with two planar rf windows were fabricated, and the rf processing test with a pulsed klystron was successfully carried out up to 1.0 MW with 1.5 msec and 5 Hz without any troubles. Assembly of the cryomodule including one 9-cell baseline cavity had completed (STF phase 0.5), and the first cool-down test is scheduled in March, 2007.
|
|