Author: Posen, S.
Paper Title Page
MOPOJO03 HELEN: A Linear Collider Based on Advanced SRF Technology 31
 
  • S.A. Belomestnykh, P.C. Bhat, M. Checchin, A. Grassellino, M. Martinello, S. Nagaitsev, S. Posen, A.S. Romanenko, V.D. Shiltsev, A. Valishev, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • S.A. Belomestnykh
    Stony Brook University, Stony Brook, USA
  • H. Padamsee
    Cornell University, Ithaca, New York, USA
 
  Funding: Work supported by the Fermi National Accelerator Laboratory, managed and operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
This paper discusses recently proposed Higgs-Energy LEptoN (HELEN) e+e’ linear collider based on advances superconducting radio frequency technology. The collider offers cost and AC power savings, smaller footprint (relative to the ILC), and could be built at Fermilab with an Interaction Region within the site boundaries. After the initial physics run at 250 GeV, the collider could be upgraded either to higher luminosity or to higher (up to 500 GeV) energies.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOJO03  
About • Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 04 September 2022 — Issue date ※ 15 September 2022
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MOPOPA13 200 MV Record Voltage of vCM and LCLS-II-HE Cryomodules Production Start Fermilab 95
 
  • T.T. Arkan, D. Bafia, D.J. Bice, J.N. Blowers, A.T. Cravatta, B. Giaccone, C.J. Grimm, B.D. Hartsell, J.A. Kaluzny, M. Martinello, T.H. Nicol, Y.M. Orlov, S. Posen
    Fermilab, Batavia, Illinois, USA
  • M. Checchin
    SLAC, Menlo Park, California, USA
 
  Funding: Department of Energy
The Linac Coherent Light Source (LCLS) is an X-ray science facility at SLAC National Accelerator Laboratory. The LCLS-II project (an upgrade to LCLS) is in the commissioning phase; the LCLS-II-HE (High Energy) project is another upgrade to the facility, enabling higher energy operation. An electron beam is accelerated using superconducting radio frequency (SRF) cavities built into cryomodules. It is planned to build 24 1.3 GHz standard cryomodules and 1 1.3 GHz single-cavity Buncher Capture Cavity (BCC) cryomodule for the LCLS-II-HE project. Fourteen of these standard cryomodules and one BCC are planned to be assembled and tested at Fermilab. Procurements for standard cryomodule components are nearing completion. The first LCLS-II-HE cryomodule, referred to as the verification cryomodule (vCM) was assembled and tested at Fermilab. Fermilab has completed the assembly of the second cryomodule. This paper presents LCLS-II-HE cryomodule production status at Fermilab, emphasizing the changes done based on the successes, challenges, mitigations, and lessons learned from LCLS-II; validation of the changes with the excellent vCM results.
 
poster icon Poster MOPOPA13 [1.975 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOPA13  
About • Received ※ 10 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 09 September 2022
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TU1AA03 R&D Towards High Gradient CW SRF Cavities 295
 
  • D. Bafia, P. Berrutti, B. Giaccone, A. Grassellino, D.V. Neuffer, S. Posen, A.S. Romanenko
    Fermilab, Batavia, Illinois, USA
 
  This talk will discuss Fermilab’s recent progress in the surface engineering of superconducting radio-frequency (SRF) cavities geared toward producing simultaneously high quality factors and high accelerating gradients in cryomodules. We investigate possible microscopic mechanisms that drive improved performance by carrying out sequential RF tests on cavities subjected to low temperature baking. We compare performance evolution to observations made with material science techniques and find correlations with material parameters. We also discuss other key advancements that enable high gradient operation in cryomodules.  
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slides icon Slides TU1AA03 [2.007 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TU1AA03  
About • Received ※ 20 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 16 October 2022
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THPOJO12 LCLS-II-HE Cryomodule Testing at Fermilab 721
 
  • A.T. Cravatta, T.T. Arkan, D. Bafia, B.E. Chase, M. Checchin, C. Contreras-Martinez, B. Giaccone, B.J. Hansen, E.R. Harms, B.D. Hartsell, J.A. Kaluzny, D.D. Lambert, J.N. Makara, H. Maniar, M. Martinello, Y.M. Pischalnikov, S. Posen, J. Reid, N. Solyak, D. Sun, A. Syed, R. Wang, M.J. White, G. Wu
    Fermilab, Batavia, Illinois, USA
  • S. Aderhold, A.L. Benwell, J.D. Fuerst, D. Gonnella, T. Hiatt, S.L. Hoobler, J.T. Maniscalco, J. Nelson, L.M. Zacarias
    SLAC, Menlo Park, California, USA
  • L.R. Doolittle, S. Paiagua, C. Serrano
    LBNL, Berkeley, California, USA
 
  22 Linac Coherent Light Source II (LCLS-II) cryomodules were successfully tested at the Cryomodule Test Facility (CMTF) at Fermilab. Following the completion of the LCLS-II testing program, CMTF has shifted to testing cryomodules for the LCLS-II High Energy upgrade (LCLS-II-HE). The first LCLS-II-HE cryomodule, the verification cryomodule (vCM), was successfully tested and verified the readiness of LCLS-II-HE cryomodule testing at CMTF, and production cryomodule testing has begun. Presented here are the production cryomodule test acceptance criteria, testing plan, and cryomodule test results so far.  
poster icon Poster THPOJO12 [0.899 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO12  
About • Received ※ 18 August 2022 — Revised ※ 27 August 2022 — Accepted ※ 06 September 2022 — Issue date ※ 15 September 2022
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