Author: Maurice, L.
Paper Title Page
TUPTB035 Design, Fabrication, and Test of a 175 MHz, β = 0.18, Half Wave Resonator for the IFMIF-DONES SRF-Linac 477
 
  • J. Plouin, M. Baudrier, S. Chel, G. Devanz, A. Madur, L. Maurice, C. Servouin
    CEA-DRF-IRFU, France
  • N. Bazin, G. Jullien
    CEA-IRFU, Gif-sur-Yvette, France
 
  The IFMIF-DONES facility will serve as a fusion-like neutron source for the assessment of materials damage in future fusion reactors. The neutron flux will be generated by the interaction between the lithium curtain and the deuteron beam from an RF linear accelerator at 40 MeV and nominal CW current of 125 mA. The last accelerating stage is a superconducting (SRF) Linac hosting five cryomodules. This SRF-Linac is equipped of two types of 175 MHz half wave superconducting cavities (HWRs). The first type of cavities (cryomodules 1 and 2), characterized by beta equal to 0.11, have been studied and qualified in the frame of IFMIF/EVEDA project. The development of the second type of cavities (cryomodules 3, 4 and 5), with higher beta of 0.18 is presented in this paper. A prototype has been designed, fabricated and tested in a vertical cryostat at CEA. The measured quality factor at nominal accelerating field (4.5 MV/m) is 2.3 109 and keeps higher than 109 up to 10 MV/m, which gives confidence in the cavity design and preparation to reach the expected performances after integration in the SRF linac.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB035  
About • Received ※ 20 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 15 July 2023
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FRIBA02 Instrumentation for High Performance Cavities and Cryomodule Field Emission Analysis 978
 
  • G. Devanz
    CEA-IRFU, Gif-sur-Yvette, France
  • M. Baudrier, E. Cenni, L. Maurice, O. Piquet
    CEA-DRF-IRFU, France
 
  Field emission (FE) is one of the main reasons for the degradation of accelerator cryomodules, as field emitted current tends to become more severe during the beam operation. It is essential to better understand how this phenomenon is generated and evolves from the SRF cavity preparation in the clean room, through their assembly in the cryomodule until their final test and operation. Due to the shielding environment of a cavity in its vertical test stand, or the architecture of a cryomodule, the more faint radiation occurring at the FE onset remains undetected. More precise diagnostic and analysis tools are required to gain more information. We present the developpement of dedicated time-resolved detectors for the FE radiation which aim at improving its coverage in terms of solid angle and lower energy threshold sensitivity. We approach this topic through detailed simulation based on the Geant4 toolkit in order to analyse the interaction of FE radiation with the cavity environement and optimize the detectors with respect to their application in cryomodule or vertical test stands. We illustrate by analysing recent cryomodule experimental test data.  
slides icon Slides FRIBA02 [9.606 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-FRIBA02  
About • Received ※ 27 June 2023 — Revised ※ 28 June 2023 — Accepted ※ 05 July 2023 — Issue date ※ 09 July 2023
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MOPMB057 Implementation of the Test Bench for the PIP-II LB650 Cryomodules at CEA 243
 
  • H. Jenhani, N. Bazin, Q. Bertrand, P. Brédy, L. Maurice, O. Piquet, P. Sahuquet, C. Simon
    CEA-IRFU, Gif-sur-Yvette, France
 
  The Proton Improvement Plan II (PIP-II) at Fermilab is the first U.S. accelerator project that will have significant contributions from international partners. As a part of the French In-Kind Contributions to this project, CEA will provide ten 650 MHz low-beta cryomodules (LB650) equipped with LASA-INFN (Italy) and VECC-DAE (India) cavities and Fermilab power couplers and RF tuning systems. CEA is accordingly in charge of the design, manufacturing, assembly and testing of these cryomodules. This paper presents the future implementation of the test stand dedicated to the cryogenic and RF power testing of the LB650 cryomodules. The choice of the equipment and the current status will be detailed, as well.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB057  
About • Received ※ 19 June 2023 — Revised ※ 23 June 2023 — Accepted ※ 26 June 2023 — Issue date ※ 05 July 2023
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WEIBA01 Surface Engineering by ALD for Superconducting RF Cavities 615
 
  • Y. Kalboussi, C.Z. Antoine, M. Baudrier, Q. Bertrand, C. Boulch, B. Delatte, G. Jullien, L. Maurice, Th. Proslier, P. Sahuquet, T.V. Vacher
    CEA-IRFU, Gif-sur-Yvette, France
  • M. Asaduzzaman, T. Junginger
    UVIC, Victoria, Canada
  • M. Asaduzzaman
    TRIUMF, Vancouver, Canada
  • D. Dragoe
    ICMMO, Orsay, France
  • F. Éozénou
    CEA-DRF-IRFU, France
  • N. Lochet
    CEA, DES, Université Paris-Saclay, Gif-sur-Yvette, France
  • D. Longuevergne, T. Pépin-Donat
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • F. Miserque
    CEA, LECA, Université Paris-Saclay, Gif-sur-Yvette, France
 
  Atomic Layer Deposition is a synthesis method that enable a unique control of thin films chemical composition and thickness over complex shape objects such as SRF cavities. This level of control opens the way to new surface treatments and to study their effect on RF cavity performances. We will present coupon and, in some cases, preliminary cavity results, from various surface engineering routes based on the deposition of thin oxides and nitrides films combined with post annealing treatments and study their interactions with the niobium. Three main research directions will be presented: 1/ replacing the niobium oxides by other surface layers (Al₂O₃, Y2O3, MgO) and probe their effect on the low and high field performances, 2/ doping with N and combine approaches 1/ and 2/ and finally 3/ optimize the superconducting properties of NbTiN multilayers on Nb and Sapphire.  
slides icon Slides WEIBA01 [13.613 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEIBA01  
About • Received ※ 06 July 2023 — Revised ※ 12 August 2023 — Accepted ※ 19 August 2023 — Issue date ※ 19 August 2023
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