MC4: Hadron Accelerators
A08 Linear Accelerators
Paper Title Page
TUVIR11 IFMIF/EVEDA RFQ Beam Commissioning at Nominal 125 mA Deuteron Beam in Pulsed Mode 21
 
  • F. Grespan, L. Bellan, M. Comunian, E. Fagotti, A. Palmieri, F. Scantamburlo
    INFN/LNL, Legnaro (PD), Italy
  • T. Akagi, Y. Hirata, K. Kondo, Y. Shimosaki, T. Shinya, M. Sugimoto
    QST, Aomori, Japan
  • B. Bolzon, N. Chauvin, J. Marroncle
    CEA-IRFU, Gif-sur-Yvette, France
  • P. Cara
    IFMIF/EVEDA, Rokkasho, Japan
  • H. Dzitko, A. Jokinen, I.M. Moya
    F4E, Germany
  • D. Jimenez-Rey, I. Podadera
    CIEMAT, Madrid, Spain
  • A. Marqueta
    Fusion for Energy, Garching, Germany
  • Á. Rodríguez Páramo
    ESS Bilbao, Zamudio, Spain
 
  In summer 2019 the IFMIF/EVEDA Radio Frequency Quadrupole (RFQ) accelerated its nominal 125 mA deuteron beam current up to 5 MeV, with 90% transmission for pulses of 1 ms at 1Hz. The Linear IFMIF Prototype Accelerator (LIPAc) is a high intensity deuteron linear accelerator; it is the demonstrator of the International Fusion Material Irradiation Facility (IFMIF). In particular the RFQ is the longest and most powerful ever operated. An intense campaign of measurements have been performed in Rokkasho to characterize several performances of this complex machine: transmission, emittances, energy spectrum and beam loading. The history and the results of the commissioning until this important project milestone are here described. An overview of the activities planned to reach CW operation is also presented.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2020-TUVIR11  
About • paper received ※ 31 May 2020       paper accepted ※ 17 August 2020       issue date ※ 09 October 2020  
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TUVIR12
Spiral2 Project Status  
 
  • P. Dolegieviez, R. Ferdinand
    GANIL, Caen, France
 
  The commissioning of the SPIRAL2 facility at GANIL is running well. A first proton beam was accelerated up to the nominal energy (33 MeV, 200µA) by the superconducting LINAC in November 2019. This paper describes the status of the SPIRAL2 facility following the authorization given by the French Nuclear Safety authority in July 2019 : cryomodule qualifications, conditioning of the superconducting cavities, safety system tests, beam commissioning and first beam sent to the Neutron For Science (NFS) experimental area. The short term objectives are finally presented.  
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TUVIR13
Status Report on a Low Energy High Intensity High Charge State Heavy Ion Accelerator Facility at Imp  
 
  • L.T. Sun, W.P. Dou, X. Fang, J.W. Guo, Y.H. Guo, Y. He, X. Jin, L. Jing, J.Q. Li, L.B. Li, X.J. Liu, L. Lu, W. Lu, H.Y. Ma, W. Ma, Y.M. Ma, L.B. Shi, L.P. Sun, F.F. Wang, Z.J. Wang, B.M. Wu, W. Wu, X.B. Xu, Y. Yang, Y.H. Zhai, B. Zhang, P. Zhang, W.H. Zhang, X.Z. Zhang, Z.L. Zhang, Z.M. Zhang, B. Zhao, H.W. Zhao, T.M. Zhu
    IMP/CAS, Lanzhou, People’s Republic of China
 
  Funding: This work was supported the NSFC (Contract no. 11427904).
A Low Energy heavy ion Accelerator Facility LEAF has been built at IMP. Aiming to prototype the room temperature front end of High Intensity Heavy Ion Accelerator Facility (HIAF)* and also serve as a stand-along operation facility for multi-discipline physics researches using high intensity low energy heavy ion beams, LEAF can accelerate high intensity ion beams of M/q=2~7 up to 0.7 MeV/u, typically >1 emA U34+. The LEAF 81.25 MHz 4-vane RFQ** has been fully commissioned to its design power. Machine study with the ion beams of M/Q=2~7 has been completed, and the typical transmission efficiency of the RFQ can reach 97%. An acceleration efficiency of 85% for heavy ion beams can be made with a multi-harmonic buncher (MHB). With a superconducting ECR ion source, highly charged uranium ion beams are available that enables the successful acceleration of high intensity uranium ion beams with LEAF. This paper will present the design and preliminary commissioning results of the facility, and future plan of an IH type DTL to tune the output energy will also be discussed.
* J. C. Yang, et al., Nucl. Instrum. Methods Phys. Res., Sect. B 317, 263 (2013).
** W. Ma, et al., Nucl. Instrum. Methods Phys. Res., Sect. A 847, 130 (2017).
 
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TUVIR16
Demonstration of Superconducting RF Linac Flexibility for High Power Linacs  
 
  • C.C. Peters, G.D. Johns
    ORNL RAD, Oak Ridge, Tennessee, USA
  • S.-H. Kim, A.P. Shishlo
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy.
Future high-power Superconducting Radio Frequency (SRF) Linacs may need to operate with strict limits on beam trip durations on the order of a few seconds. In order to provide the desired beam powers, these linacs will require significant numbers of SRF cavities which increases the probability of beam trips. The SRF linac at the Spallation Neutron Source (SNS) is currently operating with 81 SRF cavities to provide 1 GeV protons for neutron production. The typical SRF cavity trip rate is approximately 2-3 trips per week each with a recovery time on the order of a few minutes. Occasionally an SRF cavity cannot be recovered and downstream cavities must be re-phased in order to recover the beam energy. Downtime for this type of event is on the order of 30 minutes. As part of a controlled test, it has been demonstrated that after an SRF cavity trip high-power production-quality beam can be recovered automatically without operator intervention in only a few seconds.
 
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TUVIR17
Status of the Raon Heavy Ion Accelerator Project  
 
  • M. Kwon
    IBS, Daejeon, Republic of Korea
 
  The RAON heavy ion superconducting linac project is under way in Korea. The RAON consists of the 200 MeV/u superconducting linac delivering 400 kW of beam power to various targets to promote cutting edge science researches. The installation the accelerator components has started in May 2019. It aims to achieve the first beam by the end of 2021. The current status of the project will be presented.  
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