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口頭

Status and upgrade of J-PARC accelerators

長谷川 和男

no journal, , 

The J-PARC (Japan Proton Accelerator Research Complex) is a high intensity proton accelerator facility. The facility consists of a 400 MeV linac, a 3 GeV Rapid Cycling Synchrotron (RCS), a 30 GeV Main Ring synchrotron (MR) and three experimental facilities. The RCS provides a 3 GeV proton beam to the Materials and Life Science Experimental Facility (MLF) at a repetition rate of 25 Hz for neutron and muon experiments. A part of the beam from the RCS is injected to the MR and accelerated up to 30 GeV. The MR has two beam extraction modes; a fast extraction (FX) for the long-baseline neutrino experiment (called Tokai-to-Kamioka (T2K) experiment), and a slow extraction (SX) for the Hadron Experimental Facility. The maximum beam intensities for routine operation are 500 kW for the MLF, 500 kW for the FX and 51 kW for the SX. In order to increase a beam intensity for the MR-FX, a plan to shorten a cycle time is underway. To increase the beam power from the RCS, upgrade of peak current and pulse width from the linac is under discussion. The status of the J-PARC accelerators and upgrade plan will be presented.

口頭

Status report of the design of superconducting proton linac for the JAEA-ADS

Yee-Rendon, B.; 長谷川 和男; 近藤 恭弘; 前川 藤夫; 明午 伸一郎; 田村 潤

no journal, , 

The Japan Atomic Energy Agency (JAEA) is designing a CW superconducting proton linac to work as an accelerator-driven subcritical system (ADS) for the transmutation of nuclear waste. The superconducting linac will operate with a beam current of 20 mA and final energy of 1.5 GeV to achieve a beam power of 30 MW. The beam acceleration from 2 MeV to 1.5 GeV will be conducted using different types of superconducting cavities: Half-Wave Resonator (HWR), Single-Spokes (SS) and Elliptical multicell cavities. Moreover, the number of beam trips and its duration are essential constraints to achieve successful operation of the ADS, therefore a carefully beam optics design is required to avoid and control as much as possible the emittance growth, increase of the beam halo, etc. The results of cavity designs and the beam optics for the superconducting region are discussed.

口頭

Concept design of the proton linac for the JAEA-ADS

田村 潤; 長谷川 和男; 近藤 恭弘; 前川 藤夫; 明午 伸一郎; Yee-Rendon, B.

no journal, , 

The Japan Atomic Energy Agency (JAEA) is proposing an accelerator-driven subcritical system (ADS) as a future project to transmute long-lived nuclides to short-lived or stable ones. In the JAEA-ADS, a high-power proton beam of 30 MW with the beam energy of 1.5 GeV and with the beam current of 20 mA at an exit of the accelerator is required with sufficient reliability. Furthermore, the linac needs to be operated in a continuous wave (CW) mode in order to be compatible with the reactor operation. Since a normal conducting (NC) structure raises a difficulty in cavity cooling under the CW operation, a superconducting (SC) linac would be a suitable solution. In the proposed linac, the high-intensity proton beam is accelerated by an NC radio-frequency quadruple (RFQ) and low-beta SC cavities such as a half-wave resonator (HWR) and a single-spoke resonator (SSR), and finally accelerated to the designed beam energy of 1.5 GeV by elliptical cavities. To ensure the required reliability for the JAEA-ADS, doubling the ion source and the low-beta region of the linac is also proposed. Because the requirement of reliability is far beyond the capability of the current technology and the operating experience in the Japan Proton Accelerator Research Complex (J-PARC) linac, a stepwise approach of developing each accelerator component is required. In this workshop, a concept design of the proton linac for the JAEA-ADS is discussed.

口頭

Long pulse arc-driven proton source for high intensity linac of iBNCT

柴田 崇統*; 杉村 高志*; 池上 清*; 高木 昭*; 佐藤 将春*; 内藤 富士雄*; 大越 清紀; 長谷川 和男

no journal, , 

As preparations for non-clinical studies in Ibaraki Boron Neutron Capture Therapy (iBNCT), physics and cell experiments have been started in 2018 by producing high intensity proton beam in the linac with beam energy up to 8 MeV and average current up to 2 mA. In order to satisfy original clinical trial conditions, higher beam intensity upgrade is required to obtain average 5 mA beam current with enough stability. For this purpose, an arc-driven proton source equipped with lanthanum hexaboride (LaB$$_{6}$$) filament is under development. A peak beam current of 53 mA is obtained in the off-line test-stand, which is equivalent to average 5 mA in the actual operation with beam pulse up to 1 ms and repetition up to 100 Hz. Generally, arc pulser power supply (PS) should be large size to satisfy high and stable arc voltage/current, while the space-saving is important for the medical application. In the present study, a new arc pulser PS is developed for these requirements. In the presentation, the arc pulser PS and brief status of the proton source development is reported.

口頭

Operating status of the RF cavities in the J-PARC linac

森下 卓俊; 近藤 恭弘; 小栗 英知; 長谷川 和男; 田村 潤; 平野 耕一郎; 伊藤 崇; 南茂 今朝雄*; 杉村 高志*; 内藤 富士雄*

no journal, , 

J-PARC加速器はリニアック、3GeV-RCSおよび主リングで構成される。リニアックは、初段のイオン源で生成した負水素イオンを複数の高周波加速空洞を連携して加速し、RCSに入射している。高周波加速空洞は上流から高周波四重極空洞(RFQ), ドリフトチューブリニアック(DTL), 分離型DTL, 環結合空洞型結合(ACS)空洞からなる。リニアックでは2006年11月にビーム調整運転を開始し、2009年には実験施設へのビーム供給を開始した。2013年にはビームエネルギー増強のためACS加速空洞をインストールし、定格のビームエネルギーである400MeVに到達した。2014年には初段部(イオン源とRFQおよびビームチョッピングシステム)を一新し、ピーク電流50mAでの運転が可能になった。現在は中性子とミュオン実験に向けて0.27ms、ハドロン実験施設には0.1msのビームパルス幅で、ピーク電流50mAのビームをRCSに供給している。本ワークショップでは、高周波加速空洞の運転に関する進歩と動作安定性、および性能維持のためのメンテナンスについて報告する。

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