Commissioning Status of the Linac for the Facility for Rare Isotope Beams
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Commissioning Status of the Linac for the Facility for Rare Isotope Beams S. Lidia,∗ H. Ao, B. Barnes, R. Bennett, E Bernal-Ruiz, G. Bollen, J. Brandon, B. Bull, N. Bultman, F. Casagrande, D. Chabot, S. Cogan, C. Compton, K. Davidson, E. Daykin, D. Georgiobani, P. Gibson, I. Grender, S.-H. Kim, W. Hartung, M. Hausmann, L. Hodges, K. Holland, A. Hussain, M. Ikegami, M. Konrad, G. Kiupel, T. Larter, Z. Li, I. Malloch, G. Machicoane, H. Maniar, P. Manwiller, B. Martins, T. Maruta, D. Morris, P. Morrison, C. Morton, I. Nesterenko, D. Omitto, P. Ostroumov, F. Pellemoine, A. Plastun, J. Popielarski, L. Popielarski, E. Pozdeyev, H. Ren, P. Rodriguez, S. Rodriguez, T. Russo, K. Saito, R. Shane, S. Stanley, A. Stolz, G. Timko, J. Wei, M. Xu, T. Xu, Y. Yamazaki, T. Yashimoto, Q. Zhao and S. Zhao Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI 48824, USA (Received 8 January 2020; accepted 20 February 2020) The Facility for Rare Isotope Beams will be completed in late 2021. We report here on the current efforts to commission the first stages of the 200-MeV/u superconducting, continuous wave heavy-ion linac. The statuses of the cryogenic plant and its distribution system, the accelerator cryomodule commissioning and operations, the ion source and front end transport development, the radio-frequency quadrupole commissioning, and thenbeam dynamics development to support high-power operation are reviewed. Plans for commissioning the remainder of the linac systems are presented. Keywords: Linear accelerator, Commissioning, Superconducting RF, Heavy Ion DOI: 10.3938/jkps.77.344
I. INTRODUCTION The Facility for Rare Isotope Beams (FRIB) is a highpower heavy-ion accelerator facility presently under construction and commissioning at Michigan State University in the USA. The FRIB is a power frontier accelerator facility aiming to provide two to three orders of magnitude higher beam power than existing heavy-ion accelerator facilities. The FRIB linac is designed to accelerate all stable ions to energies above 200 MeV/u with a beam power of up to 400 kW with continuous wave (CW) operation [1]. The FRIB linac is being constructed beside the existing National Superconducting Cyclotron Laboratory (NSCL) to utilize its experimental beamlines (see Fig. 1). While the linac tunnel is located about 10 m below ground level for radiation shielding, its front end with two electron cyclotron resonance (ECR) ion sources [2] is located at ground level. This layout allows us to develop the next ion beam with an independent source while simultaneously providing a beam for user operation. The 12-keV/u heavy-ion beams extracted from the ion sources are delivered to a 80.5-MHz normal conducting radio-frequency quadrupole (RFQ) linac situated in the linac tunnel with a low-energy beam transport (LEBT) beamline. The LEBT has various in∗ E-mail:
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pISSN:0374-4884/eISSN:1976-8524
strumentation including extensive beam diagnostics, a pulsed electrostatic chopper and beam attenuators [3]. While the FRIB linac operates
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