Design of injection and extraction at an 8-GeV booster ring and the J-PARC Main Ring for Multi-MW output beam power

Harada, Hiroyuki; Hotchi, Hideaki; Igarashi, Susumu*; Sato, Yoichi*; Koseki, Tadashi

JPS Conference Proceedings (Internet), 8, p.012012_1 - 012012_6, 2015/09

https://doi.org/10.7566/JPSCP.8.012012

The 240-kW output beam power in the J-PARC 50-GeV Main Ring (MR) has been achieved for the 30-GeV user operation with the cycle time of 2.48 sec and the injected beam intensity with the output beam power of 380-kW equivalent from 3-GeV Rapid Cycling Synchrotron (RCS). The target of output beam power in MR is 750-kW by faster cycling and the injected beam intensity of 600-kW equivalent beam from the RCS. The MR are developing the new type power supplies of the MR main magnets and the high-impedance core of the MR RF cavities. The RCS will aim the designed output beam power of 1-MW from the beam commissioning on October 2014 after the peak current upgrade of Linac from 30 to 50-mA. For higher beam power of MR, we have explored the accelerator options. As one of options, 8-GeV Booster Ring (BR) is also designed for increasing the injection energy of the MR. The increasement of injection energy leads to the reducing a space charge force and the increasing the acceptance clearance from the physical aperture of the MR. In this paper, the realistic injection and extraction system of the BR and the new injection system of the MR for Multi-MW output beam power are also described.

Tensile properties of austenitic stainless steels irradiated at SINQ target 3

Saito, Shigeru; Kikuchi, Kenji; Usami, Koji; Ishikawa, Akiyoshi; Nishino, Yasuharu; Kawai, Masayoshi*; Dai, Y.*

Journal of Nuclear Materials, 343(1-3), p.253 - 261, 2005/08

https://doi.org/10.1016/j.jnucmat.2005.02.010

A beam window of a spallation target will be subjected to proton/neutron irradiation, pressure wave and thermal stresses accompanied by high-energy proton beam injection. To obtain the irradiation data, the SINQ target irradiation program (STIP) was initiated in 1996 at Paul Scherrer Institute (PSI) and has been progressing. JAERI takes part in STIP and shares the PIE work. In this study, the results of tensile tests on austenitic stainless steels, JPCA and 316F SS, will be reported. The results indicate that the irradiation causes considerable hardening and degradation of ductility. The YS increases in this study are slightly large in comparison with those irradiated at fission reactor. Strain-to-necking (STN) values show sufficient large ductility of the irradiated JPCA-SA and 316F-SA. The trends of the STN decrease in this study are slightly abrupt in comparison with those irradiated at fission reactor. All specimens, including irradiated at embrittlement temperature for austenitic steels, fractured in ductile manner.

Bend-fatigue properties of 590 MeV proton irradiated JPCA and 316F SS

Saito, Shigeru; Kikuchi, Kenji; Usami, Koji; Ishikawa, Akiyoshi; Nishino, Yasuharu; Kawai, Masayoshi*; Dai, Y.*

Journal of Nuclear Materials, 329-333(Part1), p.1093 - 1097, 2004/08

https://doi.org/10.1016/j.jnucmat.2004.04.152

In several institutes, research and development for an accelerator-driven spallation neutron source have been progressed. A beam window of a target will be subjected to proton/neutron irradiation, pressure wave and thermal stresses accompanied by high-energy proton beam injection. To obtain the irradiation data, the SINQ target irradiation program (STIP) at Paul Scherrer Institute (PSI) has been progressing. JAERI takes part in STIP and shares the PIE work. The STIP specimens are very small so that we developed a new fatigue-testing machine with ceramic piezoelectric actuator. The results showed that the numbers of cycles to failure (Nf) on the irradiated specimens were less than that of unirradiated specimens. Dpa dependence of Nf was not clearly seen in the irradiation conditions. On the other hand, fracture surface varied with irradiation conditions. Specimens irradiated at low temperature fractured in ductile manner. However, interglanular fractured surface was observed for 316F SS irradiated up to 12.5 dpa at 360C.

Study of ripple loss of fast ions with ferritic insertion on JFT-2M

Kawashima, Hisato; Tsuzuki, Kazuhiro; Isei, Nobuaki; Sato, Masayasu; Shinohara, Koji; Kimura, Haruyuki

Europhysics Conference Abstracts (CD-ROM), 25A, p.1337 - 1340, 2001/00

no abstracts in English

Development of negative-ion based NBI system for JT-60

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Honda, Atsushi; H.Liquen*; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Mogaki, Kazuhiko; et al.

Journal of Nuclear Science and Technology, 35(11), p.739 - 749, 1998/11

https://doi.org/10.3327/jnst.35.739

no abstracts in English

Injector Test (2) of PNC High Power Electron Linac

Wang, Y.

PNC TN9410 98-017, 21 Pages, 1998/02

PNC-TN9410-98-017.pdf:0.73MB

"Injector Test (1) of PNC High Power Electron Linac" was mentioned in last year report. 100mA beam with pulse length 20s repetition rate 1Hz and 50mA beam with pulse 1ms 0.5 Hz had been accelerated to 3.0 Mev successfully. The chopper and prebuncher system had not been used in that test. Now this report put emphases on the chopper and prebuncher systems tests. A good energy spectrum had been achieved using the chopper and prebuncher systems. And 100mA beam current with pulse length 3ms and repetition rate 0.1Hz was accelerated to 3.0 MeV.

High voltage power supply of negative-ion based NBI for JT-60U

Oga, Tokumichi; Omori, Kenichiro; Watanabe, Kazuhiro; Oshima, Katsumi*; Ito, Takao; Kawai, Mikito; Usui, Katsutomi; Kuriyama, Masaaki

Proceedings of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 2, p.1091 - 1094, 1998/00

no abstracts in English

Nuclear and thermal calculations on a hybrid system combining a proton accelerator and a fission reactor core; Study of energy conversion system

;

PNC TN9410 97-029, 39 Pages, 1997/03

PNC-TN9410-97-029.pdf:2.58MB

At present, a high power CW(Continuous Wave) electron linac accelerator is under development in PNC as a part of transmutation study by accelerators. Last year we performed nuclear and thermal calculation on a hybrid reactor system combining the electron linac and a subcritical core with TRU fuel as one of applied uses. It is well known that the hybrid reactor system can also use a proton accelerator instead of the electron one. The nuclear and thermal calculation was performed on the system using the proton accelerator in this year. Comparison of the extinguished quantity of TRU fuel was performed between calculation results of both systems. In the proton linac hybrid system, a proton beam accelerated from the linac is injected into a target located in the center of the subcritical core to produce neutrons by spallation reactions. The neutrons enter the surrounding subcritical core to extinguish the TRU. The result of calculation showed that the extinguished quantity of TRU was about 10 kg where the proton beam power of 100 MW injected into the subcritical core system of keff = 0.95 over 1 year. The extinguished quantity of TRU was about 100 times as large as that in the case studied last year on the electron linac hybrid system.

Helium transport and exhaust on ELMy H-mode and L-mode in JT-60U

Sakasai, Akira; Kubo, Hirotaka; Hosogane, Nobuyuki; Shimada, Michiya

3rd Int. Workshop on Helium Transport and Exhaust, 0, 28 Pages, 1996/00

no abstracts in English

Fast-ion radial diffusivity evaluated from vertical neutral particle measurements following short pulse beam injection into a TFTR ohmic plasma

Kusama, Yoshinori; W.W.Heidbrink*; Barnes, C. W.*; M.Beer*; G.W.Hammett*; D.C.McCune*; S.S.Medley*; S.D.Scott*; M.C.Zarnstorff*

PPPL-2813, 17 Pages, 1992/01

no abstracts in English

Heating of a plasma by neutral beam injection

Matsuda, Shinzaburo

Nihon Genshiryoku Gakkai-Shi, 16(9), p.459 - 466, 1974/09

https://doi.org/10.3327/jaesj.16.459

no abstracts in English