@inproceedings{923f9c5a99f54dbfa44683faca8a9768,
title = "RF distribution system for high power test of the SNS cryomodule",
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.",
author = "Lee, {S. W.} and Kang, {Y. W.} and M. Broyles and M. Crofford and X. Geng and Kim, {S. H.} and C. Phibbs and Strong, {W. H.} and Peglow, {R. C.} and A. Vassioutchenko",
year = "2012",
language = "English",
isbn = "9783954501151",
series = "IPAC 2012 - International Particle Accelerator Conference 2012",
pages = "2468--2470",
booktitle = "IPAC 2012 - International Particle Accelerator Conference 2012",
note = "3rd International Particle Accelerator Conference 2012, IPAC 2012 ; Conference date: 20-05-2012 Through 25-05-2012",
}