RF distribution system for high power test of the SNS cryomodule

S. W. Lee, Y. W. Kang, M. Broyles, M. Crofford, X. Geng, S. H. Kim, C. Phibbs, W. H. Strong, R. C. Peglow, A. Vassioutchenko

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A four-way waveguide RF power distribution system for testing the Spallation NeutronSource (SNS) multicavity cryomodule to investigate the collective behavior has beendeveloped. A single klystron operating at 805MHz for 1.3 msec at 60Hz powers the 4-waywaveguide splitter to deliver up to 400 kW to individual cavities. Each cavity is fedthrough a combination of waveguide splitters and vector modulators (VM) to provideindependent magnitude and phase controls. The waveguide vector modulator consists of twoquadrature hybrids and two motorized waveguide phase shifters. The phase shifters and theassembled waveguide vector modulators were individually tested and characterized for lowpower and high RF power in the SNS RF test facility. Precise calibrations of magnitude andphase were performed to generate the look up tables (LUTs) to provide operationalreferences during the cryomodule test. An I-Q demodulator module was developed and utilizedto measure relative phases in pulsed high RF power operation. PLC units were developed formechanical control of the phase shifters. Initial low/high power measurements were madeusing LabVIEW. An operation algorithm has been implemented into EPICS control for thecryomodule test stand.

Original languageEnglish
Title of host publicationIPAC 2012 - International Particle Accelerator Conference 2012
Pages2468-2470
Number of pages3
StatePublished - 2012
Event3rd International Particle Accelerator Conference 2012, IPAC 2012 - New Orleans, LA, United States
Duration: May 20 2012May 25 2012

Publication series

NameIPAC 2012 - International Particle Accelerator Conference 2012

Conference

Conference3rd International Particle Accelerator Conference 2012, IPAC 2012
Country/TerritoryUnited States
CityNew Orleans, LA
Period05/20/1205/25/12

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