Author: Hasegawa, K.
Paper Title Page
TUPTB027 Cleanroom Assembly of the LIPAc Cryomodule 452
 
  • J.K. Chambrillon, P. Cara, Y. Carin, G. Duglue, H. Dzitko, D. Gex, G. Phillips, F. Scantamburlo
    Fusion for Energy, Garching, Germany
  • N. Bazin, N. Chauvin
    CEA-DRF-IRFU, France
  • Y. Carin, D. Gex, K. Masuda, F. Scantamburlo, M. Sugimoto
    IFMIF/EVEDA, Rokkasho, Japan
  • T. Ebisawa, K. Hasegawa, K. Kondo, K. Masuda, M. Sugimoto, T.Y. Yanagimachi
    QST Rokkasho, Aomori, Japan
  • D. Jimenez-Rey, J. Mollá, I. Podadera
    CIEMAT, Madrid, Spain
  • E. Kako, H. Sakai
    KEK, Ibaraki, Japan
  • W.-D. Möller
    Private Address, Hamburg, Germany
 
  In complement to the development activities for fusion reactors (JT-60SA & ITER), Fusion for Energy contributes to the R&D for material characterisation facilities. LIPAc is the technical demonstrator for the production and acceleration of a D+ beam that will be used for neutron production by nuclear stripping reaction on a liquid Li target. Since its first beam in 2014, the LIPAc construction and commissioning continues and will be concluded with the cryomodule installation, aiming for beam validation at nominal power. The cryomodule assembly, started in March 2019, was paused due to welding issues on the solenoid bellows. The slow pumping group used for the cleanroom assembly also needed improvement to overcome helium contamination. Two and half years were devoted to the pumping improvement and, repair, cold tests and high pressure rinsing of the solenoids. In August 2022, the cleanroom assembly resumed with the mounting of all power couplers to the SRF cavities. Despite good progress, the assembly had to be paused again to fix leaks on different vacuum components and a solenoid BPM port. This paper presents the issues faced and their solutions along the cold mass assembly.  
poster icon Poster TUPTB027 [2.384 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB027  
About • Received ※ 15 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 16 July 2023
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TUPTB031 Operational Consideration in the LIPAc SRF with Potential Solenoid Failure Modes 467
 
  • T. Ebisawa, K. Hasegawa, A. Kasugai, K. Kondo, K. Masuda
    QST Rokkasho, Aomori, Japan
  • Y. Carin, H. Dzitko, D. Gex, G. Phillips
    F4E, Germany
  • J.K. Chambrillon
    Fusion for Energy, Garching, Germany
  • N. Chauvin
    CEA-DRF-IRFU, France
  • E. Kako, H. Sakai
    KEK, Ibaraki, Japan
 
  The commissioning of LIPAc (Linear IFMIF Prototype Accelerator) is ongoing at Rokkasho institute of QST for the engineering validation of the accelerator system up to 9 MeV/125 mA. Several SRF cryomodules will be required for IFMIF to accelerate deuterons from 5 MeV to 40 MeV. The prototype of the first of these cryomodules has been manufactured and will be installed and tested on the LIPAc. It holds the eight HWRs (Half Wave Resonator) and RF couplers to accelerate the beam and the eight superconducting solenoids to focus it. During the solenoid HPR process, carried out after fixing welding issues on the solenoid beam line bellows, some concerns appeared about the integrity of two solenoids. The examination with CT scanning of the solenoids revealed that one screw and a few pins had leaved their socket. Although it should be no critical problem, we tried the beam simulation with PIC code TraceWin to determine the location of solenoids whose impact will be minimized to manage in case of failure of solenoid as mitigation action. This paper presents the recommended locations of the suspicious solenoids in the cryomodule and resultant beam conditions through the beam dynamics study.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-TUPTB031  
About • Received ※ 28 June 2023 — Revised ※ 29 June 2023 — Accepted ※ 07 July 2023 — Issue date ※ 16 July 2023
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WEPWB083 Basic Design and Consideration of Li-Vapor Contamination for A-FNS SRF 773
 
  • T. Ebisawa, K. Hasegawa, A. Kasugai, M. Oyaidzu, S. Sato
    QST Rokkasho, Aomori, Japan
  • E. Kako, H. Sakai, K. Umemori
    KEK, Ibaraki, Japan
 
  The Advanced Fusion Neutron Source (A-FNS) project is in progressing in Japan, QST Rokkasho institute. A-FNS will demonstrate a performance of the DEMO DT fusion reactor material. In order to perform the test, a high intensity deuteron beam accelerator will be used to produce a high flux neutron field which is similar to the 14 MeV DT neutron. The Superconducting Radio-Frequency linear accelerator (SRF) is one component of the A-FNS accelerator system. Although the A-FNS accelerator system design is based on the IFMIF design, the improvement of some subsystem has been considering by taking into account the lessons learnt from the LIPAc project. In order to keep a high stability and availability of the SRF performance, we plan to increase the number of SRF cavities and cryomodules considering the trouble or degradation of the cavity performance and modify the engineering design of some components. In addition, changing of the beam transport line design and Li vapor contamination study of SRF cavity are conducting. In this presentation, the progress of the SRF design and related activities for A-FNS in QST will be presented.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB083  
About • Received ※ 28 June 2023 — Revised ※ 29 June 2023 — Accepted ※ 30 June 2023 — Issue date ※ 17 August 2023
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