The driver linac for the Facility for Rare Isotope Beams (FRIB) will require the production of 48 cryomodules. FRIB has completed the fabrication and testing of a β=0.085 quarter-wave cryomodule as a pre-production prototype. This cryomodule qualified the performance of the resonators, fundamental power couplers, tuners, and cryogenic systems of the β=0.085 quarter-wave design. In addition to the successful systems qualification; the ReA6 cryomodule build also verified the FRIB bottom up assembly and alignment method. The lessons learned from the ReA6 cryomodule build, as well as valuable fabrication, sourcing, and assembly experience are applied to the design and fabrication of FRIB production cryomodules. This paper will report the results of the β=0.085 quarter-wave cryomodule testing, fabrication, and assembly; production implications to future cryomodules will also be presented. INTRODUCTION FRIB is a high-power heavy ion accelerator facility now under construction at Michigan State University under a cooperative agreement with the US DOE [1]. Its driver linac operates in continuous wave mode and accelerates stable ions to energies above 200 MeV/u with the beam power on target up to 400 kW. The linac has a folded layout as shown in Figure 1, which consists of a front-end, three linac segments connected with two folding segments, and a beam delivery system to deliver the accelerated beam to target [2]. Figure 1: Schematic layout for FRIB driver linac. Due to the heavy mass and correspondingly low velocity of the accelerated ions, the FRIB driver linac utilizes four different low-beta SRF resonator designs in cryomodules as described in Table 1. For high-beta applications superconducting RF has become an established technology with a history of industrial optimization efforts; however, for low-beta structures, FRIB will be the first facility utilizing industrially produced resonators on a larger scale [3]. Table 1: Required cryomodule configurations for FRIB. Resonator and solenoid quantities per cryomodule are shown in parenthesis. The β=0.041 will cryomodule utilize a Leff =0.25 m solenoid and all other cryomodules will utilize a Leff =0.50 m solenoid. Type Cryomodule Qty. Resonator Qty. Solenoid Qty. β=0.041 3 12 (4) 6 (2) β=0.085 11 88 (8) 33 (3) β=0.29 12 72 (6) 12 (1) β=0.53 18 144 (8) 18 (1) Matching Modules 3 (β=0.085) 1 (β=0.53) 12 (4)

Construction and Performance of FRIB Quarter Wave Prototype Cryomodule

The superconducting radio frequency (SRF) portion of the Facility for Rare Isotope Beams (FRIB) linear accelerator consists of 46 cryomodules of 6 different types. Each cryomodule contains a coldmass consisting of a string of SRF resonators. There are four different types of resonators; a β=0.041 quarter wavelength resonator (QWR), a β=0.085 QWR, a β=0.29 half wavelength resonator (HWR), and a β=0.53 HWR. In total there are 324 SRF resonators in the FRIB linear accelerator. This paper provides a summary of experiences from the assembly of all FRIB coldmass types in a clean room environment.

Experiences of Superconducting Radio Frequency Coldmass Production for the FRIB Linear Accelerator

Facility for Rare Isotope Beams (FRIB) is a high-power heavy ion accelerator facility currently under construction at Michigan State University. We recently decided to adopt EPICS V4 for the architecture for commissioning application software development for FRIB linac. In this paper, we present our plan for the commissioning application development with its present status.

Development Plan for Physics Application Software for FRIB Driver Linac

The driver linac for the Facility for Rare Isotope Beams (FRIB) will require the production of 48 cryomodules (CMs). In addition to the =0.085 quarter-wave CM, FRIB has completed the design of a =0.53 half-wave CM as a pre-production prototype. This CM will qualify the performance of the resonators, fundamental power couplers, tuners, and cryogenic systems of the =0.53 half-wave design. In addition to the successful systems qualification; the =0.53 CM build will also verify the FRIB bottom up assembly and alignment method on a half-wave CM type. The lessons learned from the =0.085 pre-production CM build including valuable fabrication, sourcing, and assembly experience have been applied to the design of =0.53 half-wave CM. This paper will report the design of the =0.53 half-wave CM as well as the CM interfaces within the linac tunnel.

Design of a FRIB Half-Wave Pre-Production Cryomodule

Facility for Rare Isotope Beams is a high-power heavy ion accelerator facility now under construction at Michigan State University. An overall commissioning plan for its driver linac is established with emphasis on safety, which is presented in this paper together with hazard mitigation and machine protection assumed during commissioning.

Commissioning plan for the frib driver linac

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Commissioning plan for the frib driver linac