Speakers
Description
The quarter wave resonator (QWR, a.k.a. λ/4 resonator) for the new ISIS MEBT is a bunching cavity that longitudinally compresses the H- beam into smaller bunches. It has two gaps with a distance of βλ/2 between mid-gaps, and works in π mode at the resonant frequency of 202.5 MHz, with a phase angle of -90 degrees, and a maximum voltage per gap (E0L) of 55 kV. The detailed RF and thermal design were developed, followed by the manufacturing and testing of a prototype, all presented elsewhere. Parts for 5 new cavities were later manufactured, whose details were also presented elsewhere. This paper discusses how these new cavities were assembled, tuned and tested. The assembly was done in the metrology lab to ensure the correct alignment of the nose cones to the stem ring, with the subsequent doweling. Unexpected problems were also found, including the installation of the automatic tuner finger strips, how to achieve the expected quality factor and the conditioning of the cavities to cope with multipacting.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
|---|