Paper | Title | Page |
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MO1A01 | The FRIB Superconducting Linac - Status and Plans | 1 |
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With an average beam power two orders of magnitude higher than operating heavy-ion facilities, the Facility for Rare Isotope Beams (FRIB) stands at the power frontier of the accelerator family. This report summarizes the current design and construction status as well as plans for commissioning, operations and upgrades.
Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 and the National Science Foundation under Cooperative Agreement PHY-1102511. |
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Slides MO1A01 [48.813 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MO1A01 | |
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TUPLR029 | FRIB HWR Tuner Development | 535 |
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Funding: * This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University During the last two years the HWR pneumatic tuner development at FRIB evolved from the first prototypes to the final production design. A lot of warm testing and several cryogenic integrated tests with cavity were performed to optimize the tuner features. The main challenges included the bellow bushings binding and very tight space limitations for the assembly on the rail. The final design, based on the acquired experience, was prepared in collaboration with ANL and entered the preproduction phase. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR029 | |
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TUPLR067 | Solenoid/Magnetic Shielding Test Results in FRIB-1&2 Cryomodules | 607 |
SPWR006 | use link to see paper's listing under its alternate paper code | |
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Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University. Recently we did bunker tests for FRIB first cryomodule (CM-1) and second one (CM-2) which houses 0.085 QWRs and solenoid packages. Their performances were successfully validated in the full configuration. This paper reports the solenoid package tests results. |
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Poster TUPLR067 [4.899 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR067 | |
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TUP106024 | Optimizing Cavity Choice for FRIB Energy Upgrade Plan | 637 |
SPWR033 | use link to see paper's listing under its alternate paper code | |
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Isotope production yield rate is directly proportional to beam power, especially for heavy ions. Higher beam kinetic energy on target drives more isotope yield. FRIB has an energy upgrade plan up to ≥ 400 MeV/u for Uranium and already prepared a vacant space in the design stage and cryogenic capacity that accommodates for the energy upgrade plan[1]. This upgrade requires an optimized linac design and challenging technology for cavity performance improvement. In this paper, we will approach this issue concerning; maximizing final energy, optimum beta, cavity operating frequency, cryogenic power, fabrication and cost in order to develop a cavity that is suitable for the energy upgrade plan. | ||
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Poster TUP106024 [1.343 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106024 | |
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WE2A02 | FRIB Cryomodule Design and Production | 673 |
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Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB), under con-struction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to ura-nium up to energies of >200 MeV per nucleon with a beam power of up to 400 kW. Superconducting technology is widely used in the FRIB project, including the ion sources, linac, and experiment facilities. The FRIB linac consists of 48 cryomodules containing a total of 332 superconducting radio-frequency (SRF) resonators and 69 superconducting solenoids. We report on the design and the construction of FRIB cryomodules. |
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Slides WE2A02 [3.823 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE2A02 | |
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THOP10 | Design and Commissioning of FRIB Multipacting-Free Fundamental Power Coupler | 767 |
THPLR010 | use link to see paper's listing under its alternate paper code | |
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Funding: *Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The original Fundamental Power Coupler (FPC) of Half-Wave Resonator (HWR) for the Facility of Rare Isotope Beams (FRIB) requires multipacting conditioning at operating RF power which is up to 5 kW Continue Wave (CW). Conditioning takes a lot of time and RF power, and its elimination is highly desirable. To significantly shorten the RF conditioning, we developed a multipacting-free coupler design. This paper reports the latest progress in the optimization and prototype tests of multipacting-free coupler. The choke structure is removed and coupler geometry is further modified to protect the coupler RF window from the electron bombardment. The comparison result of multipacting-free coupler with original coupler was performed on automatic conditioning system, which showed significantly time reducing for RF conditioning. |
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Slides THOP10 [2.442 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP10 | |
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THPRC013 | Design of a FRIB Half-Wave Pre-Production Cryomodule | 795 |
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Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661. The driver linac for the Facility for Rare Isotope Beams (FRIB) will require the production of 48 cryomodules (CMs). In addition to the β=0.085 quarter-wave CM, FRIB has completed the design of a β=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 β=0.53 half-wave design. In addition to the successful systems qualification; the β=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 β=0.085 pre-production CM build including valuable fabrication, sourcing, and assembly experience have been applied to the design of β=0.53 half-wave CM. This paper will report the design of the β=0.53 half-wave CM as well as the CM interfaces within the linac tunnel. |
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Poster THPRC013 [0.954 MB] | |
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC013 | |
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THPRC021 | Status of β=0.53 Pre-Production Cryomodule | 811 |
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Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661. The driver linac for the Facility for Rare Isotope Beams (FRIB) comprises four kinds of cavities (=0.041, 0.085, 0.29, and 0.53) and six types of cryomodules including matching modules. FRIB has started the fabrication of a β=0.53 preproduction cryomodule, which is the first prototype for a half-wave (=0.29 and 0.53) cavity. This paper describes the fabrication progress and the lessons learned from the β=0.53 preproduction cryomodule. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC021 | |
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THPRC023 | Cost Reduction for FRIB Magnetic Shielding | 818 |
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Funding: *Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 Cryogenic magnetic shielding (A4K) is generally used in SRF cryomodules which is much more expensive than mu-metal used in room temperature. In order to reduce the cost, FRIB QWR and HWR magnetic shieldings were redesign to improve the shielding performance so that mu-metal can be implemented as an alternative shielding material. The magnetic shielding of first FRIB β=0.085 cryomodule was made up of 50% by A4K and 50% by mu-metal. Cavities were tested in 4K and 2K, the results showed that the Q0 of cavities were similar for both shielding materials, which is a success as a validation test for mu-metal magnetic shielding. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC023 | |
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THPRC024 | Polarity Check of the FRIB Cryomodule Solenoids by Measuring Leakage Magnetic Field | 821 |
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Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661. We observed the outside magnetic field of the first β=0.085 production cryomodule while a solenoid and steering dipoles are under operation. This measurement aims to check the polarity on these magnets after the final installation in the accelerating tunnel. This paper also shows the residual magnetic field variation through the degaussing process of these magnets. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC024 | |
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