Author: Xu, W.
Paper Title Page
TUPTEV016 Upgrade of the RHIC 56 MHz Superconducting Quarter-Wave Resonator Cryomodule 522
 
  • Z.A. Conway, R. Anderson, D. Holmes, K. Mernick, S. Polizzo, S.K. Seberg, F. Severino, K.S. Smith, Q. Wu, B.P. Xiao, W. Xu, A. Zaltsman
    BNL, Upton, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
In preparation for the 2023 RHIC sPHENIX experi-mental program the superconducting 56 MHz quarter-wave resonator cryomodule, used operationally for longitudinal bunch compression with up to 1 MV RF voltage, is being refit to accommodate an expected beam current of 418 mA per ring, an increase of ~1.5 relative to previous operation. The upgrades to the system include an improved fundamental mode damp-er, and dual function fundamental power and higher-order mode damper couplers. This paper will describe the preliminary testing, select subsystem changes and plans for testing the cryomodule prior to installation in the RHIC beam line in 2022.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-TUPTEV016  
About • Received ※ 21 June 2021 — Revised ※ 09 February 2022 — Accepted ※ 22 February 2022 — Issue date ※ 28 April 2022
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WEPTEV002 High Power Coupler Devepment for EIC 632
 
  • W. Xu, Z.A. Conway, J.M. Fite, D. Holmes, K.S. Smith, A. Zaltsman
    BNL, Upton, New York, USA
 
  Funding: This work is supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
The future EIC Electron storage ring at BNL needs to compensate up to 10 MW synchrotron loss with RF systems. The RF system relies on 34 fundamental power couplers to deliver RF power from power sources at room temperature to 17 SRF cavities at 2 K. Each power coupler will operate with 400 kW forward power, with full reflection for ~10% of time. We are developing two 1 MW coaxial FPCs at BNL, one with a BeO window and the other with an Al2O3 window. This paper will briefly summarize test results of high power test on the BeO window FPC , and then describe the development status of the Al2O3 window FPC.
 
poster icon Poster WEPTEV002 [3.393 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-WEPTEV002  
About • Received ※ 25 June 2021 — Revised ※ 28 January 2022 — Accepted ※ 05 April 2022 — Issue date ※ 12 May 2022
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THOTEV04
Fundamental Power Couplers and HOM Couplers for High Intensity Application  
 
  • W. Xu
    BNL, Upton, New York, USA
 
  Funding: This work is supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy.
High current beams are at the basis of cutting-edge accelerator science and are required in various applications, such as election-ion colliders (EIC), accelerator-driven systems (ADS) and high power Free Electron Lasers (FEL). The RF challenges for these applications are high RF power coupler to deliver RF energy to beam and high power HOM coupler to take the unwanted HOM power out of a SRF cavity. This presentation will overview the high power FPCs and HOM couplers in high-current, high power accelerator applications around the world. Detailed consideration of BNL’s effort on design, manufacture and test 500 kW, 591 MHz input power couplers and 20 kW higher order mode absorbers for the EIC SRF systems will be shown. Both of these high power applications extend current performance of this type of hardware in power handling and size. The design motivations inherent to the EIC SRF, how these devices address the EIC-SRF requirements and current prototype testing results will be presented in this talk.
 
slides icon Slides THOTEV04 [5.717 MB]  
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