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MOPO004 | Commissioning of the SRF Booster Cavity for LEReC | cavity, SRF, gun, MMI | 40 |
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Funding: This work is supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE. One important component for LEReC project is a 704 MHz booster cavity, which was modified from the BNL ERL 704 MHz SRF gun cavity. The major modifications include converting the upstream cathode transportation to a proper beam pipe, adding a HOM coaxial line HOM damper to the downstream, retracting FPC insertions, and improvement of cryomodule layout. In the past one and half year, tremendous work was completed: the cavity was modified and tested vertically, FPC were conditioned, and HOM damper were designed and conditioned, cryomodule was re-assembled. The booster cavity cryomodule was successfully commissioned in mid October, and it was moved to LEReC location at RHIC tunnel 2 O’clock early November. This paper will report the configuration of the new cryomodule and its commissioning results. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO004 | ||
About • | paper received ※ 22 August 2018 paper accepted ※ 22 September 2018 issue date ※ 18 January 2019 | ||
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MOPO005 | Commissioning of the Normal Conducting Cavities for LEReC Project | cavity, electron, MMI, vacuum | 44 |
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Funding: Work is supported by Brookhaven Science Associates, LLC under contract No. DE-AC02-98CH10886 with the US DOE. To improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is designed, and is currently under commissioning at BNL. The linac of LEReC consists of a DC photoemission gun, a 704 MHz superconducting radio frequency (SRF) booster cavity, a three-cell 2.1 GHz third harmonic cavity for RF curvature correction, a single-cell 704 MHz cavity for energy de-chirping and a 704 MHz deflecting cavity for diagnostic line. In this paper, we present the commissioning of three normal conducting cavities mentioned above. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO005 | ||
About • | paper received ※ 14 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 | ||
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MOPO006 | Crosstalk Effect in the LEReC Booster Cavity | cavity, resonance, HOM, cathode | 47 |
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Funding: Work is supported by Brookhaven Science Associates, LLC under contract No. DE-AC02-98CH10886 with the US DOE. The Linac of Low Energy RHIC electron Cooler (LEReC) is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with peak-to-peak dp/p less than 7·10-4. The booster cavity is the major accelerating component in LEReC, which is a 0.4 cell cavity operating at 2 K, with a maximum energy gain of 2.2 MeV. It is modified from the Energy Recovery Linac (ERL) photocathode gun, with fundamental power coupler, pickup coupler and HOM coupler close to each other. Crosstalk effect in this cavity is simulated and measured. Correction method is proposed to meet the energy spread requirement. |
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DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO006 | ||
About • | paper received ※ 14 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 | ||
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MOPO092 | A 3-gap Booster Cavity to Match Ion Source Potential to RFQ Acceptance | rfq, ISAC, space-charge, bunching | 196 |
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The ISAC RFQ can accelerate ions with A/Q ration from 1 to 30 and requires an input energy of 2.04keV/u. The harsh environment of the ISAC on-line ISOL target facility makes it difficult to meet the energy for the heaviest masses. For these cases we have designed and installed a short three gap device that accelerates the beams produced at source potential to match the required energy for RFQ acceptance. The booster cavity operates at 11.7MHz, the RF frequency of the pre-buncher. The device can also be used as a second buncher to augment the acceptance in the RFQ or to improve the acceptance of higher space charge beams. The device will be described and the results of beam measurements will be given. | |||
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Slides MOPO092 [7.627 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO092 | ||
About • | paper received ※ 14 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 | ||
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TH1P02 | Injection Complex Development for the NICA-project at JINR | rfq, linac, acceleration, injection | 663 |
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The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is still under construction at JINR, Dubna. Two Linacs should serve as injectors for this new accelerator complex. LU-20 as an Alvarez based lLinac for light polarized ions and the new Heavy Ion Linear Accelerator HILAC dedicated to heavy ion beam operation. Main results of the HILAC commissioning with carbon beam from the laser ion source should be discussed. Besides a new R&D-project is ongoing to developed superconducting cavities for a new light ion linear injector which created to upgrade the injector complex. The current status of linac design and results of the beam dynamics simulations and SRF technology developments should be presented as well. | |||
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Slides TH1P02 [8.162 MB] | ||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TH1P02 | ||
About • | paper received ※ 17 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 | ||
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THPO127 | The Effect of Energy Fluctuation on the Multi-bunch Acceleration in E-driven ILC Positron Source | positron, acceleration, beam-loading, cavity | 958 |
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E-Driven method is a technical backup for positron source for ILC. In the positron source, the positron is generated and accelerated in a multi-bunch format with gaps in a macro-pulse. We employ AM (Amplitude Modulation) to suppress the transient beam-loading, but a small fluctuation is still expected, depending on the compensation accuracy. In this article, the positron yield which is ratio of numbers of positrons over electrons, is evaluated as a function of the compensation accuracy. With this result and the detail investigation of the beam loading compensation accuracy by AM, the positron yield of E-Driven Positron source for ILC is evaluated. | |||
DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO127 | ||
About • | paper received ※ 12 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 | ||
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