Paper | Title | Page |
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MOOP01 | The SARAF-LINAC Project Status | 38 |
MOPLR075 | use link to see paper's listing under its alternate paper code | |
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SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the superconducting linac (SARAF-LINAC Project). This paper presents to the accelerator community the status at August 2016 of the SARAF-LINAC Project. | ||
Slides MOOP01 [4.978 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP01 | |
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MOOP02 | Current Status of Superconducting Linac for the Rare Isotope Science Project | 41 |
MOPLR074 | use link to see paper's listing under its alternate paper code | |
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The RISP (Rare Isotope Science Project) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. It can deliver ions from proton to uranium. Proton and uranium ions are accelerated upto 600 MeV and 200 MeV/u respectively. The facility consists of three superconducting linacs of which superconducting cavities are independently phased. Requirement of the linac design is especially high for acceleration of multiple charge beams. We present the RISP linac design, the prototyping of superconducting cavity and cryomodule. | ||
Slides MOOP02 [5.566 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP02 | |
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MOPRC015 | Development Status of FRIB On-line Model Based Beam Commissioning Application | 100 |
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Funding: The work is supported by the U.S. National Science Foundation under Grant No. PHY-11-02511, and the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. The new software FLAME has been developed to serve as physics model used for on-line beam commissioning applications. FLAME is specially designed to cover FRIB modeling challenges to balance between speed and precision. Several on-line beam commissioning applications have been prototyped based on FLAME and tested on the physics application prototyping environment. In this paper, components of the physics application prototyping environment are firstly described. Then, the design strategy and result of the four major applications: baseline generator, cavity tuning, orbit correction, transverse matching, are discussed. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC015 | |
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TUOP04 | On the Acceleration of Rare Isotope Beams in the Reaccelerator (ReA3) at the National Superconducting Cyclotron Laboratory at MSU | 390 |
TUPLR076 | use link to see paper's listing under its alternate paper code | |
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The ReAccelerator ReA3 is a worldwide unique, state-of-the-art linear accelerator for rare isotope beams. Beams of rare isotopes are produced and separated in-flight at the NSCL Coupled Cyclotron Facility and subsequently stopped in a linear gas cell. The rare isotopes are then continuously extracted as 1+ ions and transported into a beam cooler and buncher. Ion pulses provided by this device are then transported to a charge breeder based on an Electron Beam Ion Trap (EBIT) where they are captured in flight. The 1+ ions are ionized to a charge state suitable for acceleration in the superconducting radiofrequency (SRF) ReA3 linac, extracted in a pulsed mode and mass analyzed. The extracted beam is pre-bunched before injection into the RFQ and SRF linac, both operating at frequency of 80.5 MHz, and then accelerated to energies from 300 keV/u up to 6 MeV/u, depending on the charge-to-mass ratio of the ion. Stable isotopes can alternatively also be injected into the linac from the EBIT in off-line mode (by ionization of residual gas) or from external off-line ion sources. This contribution will focus on the methodology, properties and techniques used to accelerate and control low intensity rare isotope beams. Results obtained during the preparation of various experiments using the ReA facility, including those with the rare ions 46Ar and 37,46,47K will also be presented. | ||
Slides TUOP04 [1.979 MB] | ||
Poster TUOP04 [2.602 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP04 | |
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TUPLR028 | Alternative Design for the RISP Pre-Stripper Linac | 531 |
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Funding: This work was supported by the work-for-other grant WFO8550H titled "Pre-conceptual design, cost and schedule estimate of the 18.5 MeV/u Pre-stripper linac for the RISP/IBS" In a collaborative effort between Argonne's Linac Development Group and the RISP project team at the Korean Institute for Basic Science, we have developed an alternative design for the pre-stripper section of the RISP driver linac. The proposed linac design takes advantage of the recent accelerator developments at Argonne, namely the ATLAS upgrades and the Fermilab PIP-II HWR Cryomodule. In particular, the state-of-the-art performance of QWRs and HWRs, the integrated steering correctors and clean BPMs for a compact cryomodule design. To simplify the design and avoid frequency transitions, we used two types of QWRs at 81.25 MHz. The QWRs were optimized for β ~ 0.05 and ~ 0.11 respectively. Nine cryomodules are required to reach the stripping energy of 18.5 MeV/u. Following the lattice design optimization, end-to-end beam dynamics simulations including all sources of machine errors were performed. The results showed that the design is tolerant to errors with no beam losses observed for nominal errors. However, the robustness of the design could be further improved by a modified RFQ design, better optimized with the multi-harmonic buncher located upstream. This could lead to a significant reduction in the longitudinal beam emittance, offering much easier beam tuning and more tolerance to errors. The proposed design and the simulation results will be presented and discussed. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR028 | |
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TUPLR061 | Cryomodule and Power Coupler for RIKEN Superconducting QWR | 598 |
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In RIKEN Nishina Center, we are constructing a prototype of low-beta superconducting QWR for ions. Presently, the designs of cryomodule, which contains two QWRs, and power coupler are being carried out. In this contribution, the progress situation for the construction of cryomodule and power coupler will be reported. This work was funded by ImPACT Program of Council for Science, Technology and innovation (Cabinet Office, Government of Japan). | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR061 | |
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TUPLR063 | IMPACT Model for ReA and its Benchmark with DYNAC | 601 |
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Funding: * Work supported by the U.S. National Science Foundation under Grant No. PHY-11-02511 ** Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 Abstract New online model for ReAccelerator 3 (ReA3) has been developed for actual beam tunings using IMPACT, which is one of famous particle tracking codes in accelerator field. DYNAC model was used for ReA3 optics calculation. However it basically can calculate symmetric cavity, not axisymmetric ones such as super-conductive Quarter-Wave Resonators (QWRs), which are installed in ReA3. This means that it is difficult to effectively tune beams at present situation. In order to handle beams at ReA3, a new alternative and more precise model of IMPACT is under development, which would be acceptable to actual beam operation. This paper reports benchmarked results of IMPACT and DYNAC model for ReA3 acceleration line just after RFQ exit to a transport line with symmetric cavity as a first step before more precise simulation including non-axisymmetric cavity and RFQ calculation. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR063 | |
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TUPLR066 | High Current Beam Injector for Cancer Therapy | 604 |
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A hybrid single cavity (HSC) linac, which is formed by combining a radio frequency quadrupole (RFQ) and a drift tube (DT) structure into one interdigital-H (IH) cavity, is fabricated and assembled as a proof of principle injector for cancer therapy synchrotron, based on the culmination of several years of research. The HSC linac adopts a direct plasma injection scheme (DPIS), which can inject a high intensity heavy ion beam produced by a laser ion source (LIS). The input beam current of the HSC is designed to be 20 mA C6+ ions. According to numerical simulations, the HSC linac can accelerate a 6-mA C6+ beam, which meets the requirement of the needed particle number for cancer therapy (108~9 ions/pulse). The HSC injector with the DPIS method makes the existing multi-turn injection system and stripping system unnecessary, and can also bring down the size of the beam pipe in existing synchrotron magnets, which could reduce the whole cost of synchrotron. The radio frequency (RF) measurements show excellent RF properties for the resonator, with a measured Q equal to 91% of the simulated value. A C6+ ion beam extracted from the LIS was used for the HSC commissioning. In beam testing, we found the measured beam parameters agreed with simulations. More details of the measurements and the results of the high power test are reported in this paper. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR066 | |
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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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TUPLR068 | Progress and Design Studies for the ATLAS Multi-User Upgrade | 610 |
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Funding: This work was supported by the U.S. DOE Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. This research used resources of ANL's ATLAS facility, a DOE Office of Science User Facility. The motivations and the concept for the multi-user upgrade of the ATLAS facility at Argonne were presented at recent conferences. With the near completion of the integration of the CARIBU-EBIS for more pure and efficient charge breeding of radioactive beams, more effort is being devoted to study the design options for a potential ATLAS mutli-user upgrade. The proposed upgrade will take advantage of the pulsed nature of the EBIS beams and the cw nature of ATLAS, in order to simultaneously accelerate beams with very close charge-to-mass ratios. In addition to enhancing the nuclear physics program, beam extraction at different points along the linac will open up the opportunity for other possible applications. Different beam injection and extraction schemes are being studied and will be presented. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR068 | |
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TUPLR069 | Simulation Study on the Beam Loss Mitigation in the 1st Arc Section of FRIB Driver Linac | 613 |
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Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661. The Facility of Rare Isotope Beams (FRIB) at Michigan State University is now under construction toward user operation in year 2020. Charge-state transition of accelerating ions occurs in the beam line due to interaction with the residual gas. Since this exchange changes charge to mass ratio of the ions, the ion orbit is distorted especially in an arc section with the ion potentially hitting the vacuum pipe. This will generate outgassing from the beamline pipe. Moreover, they become a seed of further charge-state exchanges. Therefore, a collimation of charge exchanged ions is necessary to prevent this feedback cycle. In this presentation, the results of a simulation study on charge exchange reaction in the 1st arc section of FRIB and optimization of collimator position are presented. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR069 | |
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TUPLR070 | Efficient Heavy Ion Acceleration with IH-Type Cavities for High Current Machines in the Energy Range up to 11.4 MeV/u | 616 |
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Funding: BMBF 05P15RFRBA We propose an efficient design for heavy ion acceleration from 1.4 to 11.4 MeV/u with a design current of 15 emA for a Uranium 28+ beam. The proposed linac is based on IH-DTL cavities and quadrupole triplet focusing. The KONUS beam dynamics concept is used to achieve high acceleration efficiency. By optimization of the transversal focusing scheme and the longitudinal bunch center motion, low emittance growth for the entire linac is achieved. Beam dynamics simulations were performed along with 3D rf-simulations of all cavities. The cavities are designed for 108.408 MHz, reaching an effective shunt impedance of 100-200 MOhm/m. The overall length of the linac is below 25 m. A mechanical realization concept employing a modular tank design is presented. The proposed design is a viable option for the GSI UNILAC poststripper linac replacement, leaving free space in the UNILAC tunnel for future energy upgrades. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR070 | |
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TUPLR072 | Fabrication and Low Temperature Test Plan for Rare Isotope Science Project | 619 |
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Quarter-wave resonator (QWR), half-wave resonator (HWR) and single-spoke resonator (SSR) cryomodules are used for RAON accelerator. The layout of RAON accelerator and three types of cryomodules such as QWR, HWR and SSR are shown in the linac. SRF test facility which consists of cryoplant, cleanroom, vertical test facility and horizontal test facility is constructed. Cleanroom has high pressure rinsing (HPR), ultrasonic cleaning (USC), buffered chemical polishing (BCP), high vacuum furnace and cavity assemble place. The test plan for cavity and cryomodules is presented. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR072 | |
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TUPLR073 | Development of RAON QWR Cryomodule for Linac Demonstration | 622 |
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Quarter-wave resonator (QWR) cryomodule is developed for linac demonstraction. The plan and layout of the linac demonstration are shown. 3D drawing and P&ID are shown for the quarter-wave resonator (QWR) cryomodule. The QWR cryomodule consists of cavity, coupler, tuner, liquid helium reservoir, thermal shield and magnetic shield. PLC rack is fabricated to control the QWR cryomodules. The PLC controls and monitors pumps, heaters, cryogenic valves, solenoid valves, gate valves and temperature sensors. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR073 | |
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TUP106001 | Magnetic Field Measurements in a Cryomodule with Nearby Warm-Section Quadrupole Magnets of RAON Heavy Ion Accelerator | 625 |
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For the Korean heavy ion accelerator RAON, a normal-conducting quadrupole magnet doublet with an intermediate beam diagnostic devices between two cryomodules is served for collimating the heavy ion beam. Although the fringe field of a magnet at a superconducting cavity position is low enough, differently from a strong superconducting solenoid, it can degrade the acceleration performance in the case of quench of the cavity directly and/or indirectly by contaminating the cryomodule wall and magnetic shields. In this study, we analyze the magnetic measurement results in the cryomodule assembled with the magnet doublet compared to the calculated ones and discuss the future plan. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106001 | |
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TUP106004 | Status of RRR Analysis for RAON Accelerator | 628 |
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Residual resistance ratio (RRR) of 300-grade niobium has been analyzed to find optimal welding condition for a superconducting cavity. RRR values were not only measured along the welding directions, but also perpendicular to the welding lines. In this presentation, we will show the RRR analysis as a function of the distance, the welding speed, and the welding pressure. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106004 | |
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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. | ||
Poster TUP106024 [1.343 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106024 | |
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WE1A05 | HIE-ISOLDE SC Linac Progress and Commissioning in 2016 | 663 |
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The HIE-ISOLDE project (High Intensity and Energy ISOLDE) reached an important milestone in October 2015 when the first physics run was carried out with radioactive Zn beams at 4 MV/m. This is a first stage in the upgrade of the REX post-accelerator, whereby the energy of the radioactive ion beams was increased from 3 to 4.3 MeV per nucleon. The facility will ultimately be equipped with four high-beta cryomodules that will accelerate the beams up to 10 MeV per nucleon for the heaviest isotopes available at ISOLDE. The first cryomodule of the new linac, hosting five superconducting cavities and one solenoid, was commissioned in summer 2015, while the second one was being assembled in clean room. The new high-energy beam transfer lines were installed and commissioned in the same lapse of time. Commissioning with two cryomodules is planned for Summer 2016 to prepare for a physics run at 5.5 MeV/u in the second half of the year. This contribution will focus on the results of the commissioning and operation of the SC linac in 2015. Plans for the second phase of the HIE-ISOLDE project will be highlighted. | ||
Slides WE1A05 [4.194 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE1A05 | |
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TH1A03 | Development of New Heavy Ion Linacs at GSI | 688 |
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The heavy ion linac UNILAC at GSI will be upgraded in order to meet the beam requirements imposed by the upcoming FAIR facility. This upgrade includes several innovative techniques and applications. They comprise a new gaseaous stripper with enhanced efficiency, full 4d transverse emittance measurements, a round-to-flat beam adaptor, asymmetric transverse focusing along the new Alvarez DTL, optimized shape of the drift tube surface w.r.t. shunt impedance per surface field, and a field stabilization and tuning scheme without post-couplers. Additionally, we report on development of a super-conducting cw linac for intermediate mass ions which will be dedicated to production of super heavy elements close to the Coulomb barrier. | ||
Slides TH1A03 [3.016 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A03 | |
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THPLR061 | Research on a Two-beam Type Drift Tube Linac | 989 |
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The very high intense heavy-ion beam is a high attraction for heavy ion researches and heavy-ion applications, but it is limited by heavy-ion production of ion source and space-charge-effect in acceleration. There is one way, accelerating several heavy-ion beams in one cavity at same time and funneling them, which could achieve the acceleration of very high intense heavy-ion beam with existing ion source and accelerating technology. In this paper, we will introduce our designs, calculations and simulations of a 2-beam type drift tube linac. | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR061 | |
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