Abstract
Qualification of the superconducting radio-frequency
(SRF) cavities in the cryomodules for the accelerating
performance needs to be done through high power
processing. A four-way waveguide power distribution
system with independent control of power outputs has
been being developed for testing the multi-cavity
cryomodules for the SNS linac. SNS is employing two
types of cryomodules: one type with three medium beta
six-cell cavities and the other with four high beta six-cell
cavities. The cryomodule that is being manufactured as a
spare and the new crymodules for the future power
upgrade project (PUP) of SNS will be high beta types.
The four-way power distribution with independently
controlled power outputs was considered useful for
powering all cavities at the same time with a klystron
amplifier since the SNS test facility was configured for a
single klystron operation. Since certain interaction
between the cavities under severe field emission was
suspected in existing cryomodules, this type of high
power test can be valuable for characterization of SRF
cavities. By implementing a vector modulator at each arm
of the splitting system, the amplitudes and the phases of
RF outputs can be controlled independently. This paper
discusses the present status of the development.
