Paper | Title | Other Keywords | Page |
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MOPLR054 | Progress and Operation Experiences of the J-PARC Linac | linac, operation, ion, rfq | 257 |
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The J-PARC linac started beam commissioning in 2006 and has delivered beam to users since 2008. The linac had been operated with a beam energy of 181 MeV and a peak beam current of 15-20 mA, which corresponds to the 3 GeV Rapid Cycling Synchrotron (RCS) beam power of 300 kW. An energy of 400 MeV and higher peak beam current of 50 mA linac was required to reach the goal of the J-PARC project. For the beam energy upgrade, we installed a new accelerating structure, Annular-ring Coupled Structure linac (ACS) in 2013. The ion source and the Radio Frequency Quadrupole linac were replaced to increase the peak beam current in 2014. Since then, the linac provides beams to demonstrate a 1 MW equivalent beam at the RCS and also for routine operation for user programs. The progress and operation experiences of the J-PARC linac are presented. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR054 | ||
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MOPLR060 | CIADS Normal Temperature Front-End Design | rfq, emittance, proton, ion | 267 |
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The design and construction with several tens of megawatts superconducting accelerator is the developing direction in the further. The superconducting section follows the RFQ and MEBT, which needs good enough beam quality. The normal temperature front ends are redesigned for China Initiative ADS. The LEBT transports a 35KeV, 10mA DC proton beam to the RFQ, after the RFQ acceleration the MEBT transports a 2.1MeV 10mA CW proton beam to the superconducting DTL. The "Point Source" is proposed in the beam scrape application during the LEBT section to get the ideal transverse beam parameters. To get the ideal longitudinal beam parameters, the new RFQ is designed with little emittance. Collimators are installed in the new MEBT to scrape the outer sphere beams which may turn to halo. Details of the beam dynamics simulations will be given. | |||
Poster MOPLR060 [1.109 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR060 | ||
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TUPRC011 | Ongoing Studies of the SuSI ECR Ion Source and Low Energy Beam Transport Line at the MSU NSCL | ion, extraction, plasma, emittance | 438 |
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Funding: Research supported by Michigan State University and National Science Foundation Award PHY-1415462. Heavy ion accelerator laboratories for nuclear science and rare isotope research require a wide array of high intensity heavy ion beams. Due to their versatility and robustness, Electron Cyclotron Resonance (ECR) ion sources are the choice injectors for the majority of these facilities worldwide. Steady improvements in the performance of ECR ion sources have been successful in providing intense primary beams for facilities such as the National Superconducting Cyclotron Laboratory (NSCL). However, next generation heavy ion beam laboratories, such as the Facility for Rare Isotope Beam (FRIB), require intensities that approaching the limits of current possibility with state of the art ion source technology. In this proceedings, we present the ongoing low energy beam transport characterization efforts of a superconducting ECR ion source injector system at the MSU NSCL. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC011 | ||
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TUPRC019 | Beam Instabilities in Electron Cyclotron Resonance Ion Sources | plasma, ion, cyclotron, electron | 455 |
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Funding: This research is funded by joint assistance from the NSF and D.O.E. Accelerator facilities for radioactive beams and low energy nuclear physics such as FRIB require intense, stable ion beam currents in order to achieve required reaction rates for rare and undiscovered isotopes. Presently, the only way to produce intense Continuous Wave beams of highly-charged, medium to heavy-mass ions is with Electron Cyclotron Resonance Ion Sources (ECRIS). The complex nature of these devices causes temporal instabilities to occur, most notably: Slow and fast instabilities. Slow instabilities and drifts, occurring over hours, decay the beam current intensity due to variations in ambient and hardware conditions. These drifts require beam operators to constantly monitor and tune ECRIS plasma parameters in order to maintain experimental beam requirements. Fast instabilities, in the form of ms oscillations, occur at operational parameters needed for high-intensity, high-charge state beams. These oscillations cause sudden drops in beam current of the order of 30%. We present here initial results of recent measurements to investigate these instabilities. Results for slow instabilities indicate a linear decay of beam intensity following a sharp current drop due to a brief source conditioning period. Results for fast instabilities show a relationship between the frequency and amplitude of beam oscillations and the electric potential of the plasma chamber bias disk. |
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Poster TUPRC019 [0.817 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC019 | ||
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TUPRC032 | An Analysis of Fast Sputtering Studies for Ion Confinement Time | ion, plasma, electron, ECRIS | 475 |
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Funding: This work was supported by Michigan State University and the National Science Foundation: NSF Award Number PHY-1415462 Existing heavy ion facilities such as the National Superconducting Cyclotron Laboratory at Michigan State University rely on Electron Cyclotron Resonance (ECR) ion sources as injectors of highly charged ion beams. Long ion confinement times are necessary to produce dense populations of highly charged ions because of steadily decreasing ionization cross sections with increasing charge state. To further understand ion extraction and confinement we are using a fast sputtering technique first developed at Argonne National Laboratory (ANL) [1] to introduce a small amount of uranium metal into the plasma at a well-defined time. We present an analytical solution to the coupled ion density rate equations for using a piecewise constant neutral density to interpret the fast sputtering method. *R. Vondrasek et al., Rev. Sci. Instrum. 73, 548-551 (2002). |
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Poster TUPRC032 [0.699 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC032 | ||
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TUP106007 | Results of Intensity Upgrade Phase I for 200 MeV H− Linac at Brookhaven | linac, ion, target, operation | 634 |
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The 200 MeV H− Linac has been operational for the last 45 years providing beam for the physics and isotope programs. Yearly integrated intensity delivered to BLIP has bean increased by six fold in past decade. Recently we have finish intensity, which resulted 40% more intensity for Brookhaven Linac Isotope Program (BLIP) and reduced losses along the linac and transfer line to BLIP by several folds. We will present detail of the upgrade and the future upgrades plane to further increase the intensity by factor of two | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUP106007 | ||
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WE1A06 | Status of SPIRAL2 and RFQ Beam Commissioning | rfq, linac, ion, proton | 668 |
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The SPIRAL2 project beam commissioning is started and the superconducting linac installation is being finalized. In parallel with the installations, the first proton beam was extracted in 2014 and the expected beam performances were achieved from both light and heavy ion sources. The conditioning of the RFQ started in October 2015, and the beam commissioning soon after that. After having briefly recalled the project scope and parameters, the present situation of the RFQ beam commissioning is presented. | |||
Slides WE1A06 [19.488 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE1A06 | ||
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THOP08 | Beam Commissioning of the i-BNCT Linac | linac, target, rfq, ion | 760 |
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The beam commissioning of the linac for the boron neutron capture therapy of Ibaraki prefecture (i-BNCT) has been started. The accelerator of i-BNCT consists of the 3-MeV RFQ and 8-MeV DTL. The design of RF structure of them is based on the J-PARC linac. After the first demonstration of neutron production on December 2015, significant modifications to the linac were given in order to increase the operation stability and the beam power. The progress of the beam commissioning of the i-BNCT will be presented. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP08 | ||
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THPLR026 | Radio Frequency Surface Plasma Source With Solenoidal Magnetic Field | plasma, ion, solenoid, electron | 902 |
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Funding: The work was supported in part by US DOE Contract DE-AC05-00OR22725 and by STTR grant, DE-SC0011323. Operation of Radio Frequency surfaces plasma sources (RF SPS) with a solenoidal magnetic field are described. RF SPS with solenoidal and saddle antennas are discussed. Dependencies of beam current and extraction current on RF power, gas flow, solenoidal magnetic field are presented. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR026 | ||
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FR1A03 | Intense Beam Production of Highly Charged Ions by the Superconducting ECR Ion Source SECRAL for Heavy Ion Linacs | ion, ECRIS, ECR, linac | 1027 |
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Superconducting ECR ion source (SC-ECRIS) represents the state of the art technologies of ECR ion sources. Existing SC-ECRISs developed in different labs have contributed significantly for ECRIS technology advancement in the last 15 years. Recently the superconducting ECR ion source SECRAL operated at 24 GHz at IMP has produced many new world recorded beam intensities of highly charged ions due to new technologies applied, such as a new microwave coupling scheme. At the meantime, the world first 4th generation ECR ion source operated at 45 GHz is being developed at IMP. All these developments on intense beam production of highly charged ions with superconducting ECR ion source may play significant roles for the next generation heavy ion linacs such as FRIB and Linac of HIAF project. This paper will report the recent developments of intense highly charged heavy ion beams at IMP and the discussion on perspectives of next generation ECRIS for the future heavy ion liancs. | |||
Slides FR1A03 [13.557 MB] | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-FR1A03 | ||
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