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Journal Articles

Beam based alignment of synchrotron under coupled quadrupole magnet environment

Hayashi, Naoki; Hatakeyama, Shuichiro; Harada, Hiroyuki; Hotchi, Hideaki; Takano, Jumpei*; Tejima, Masaki*; Toyama, Takeshi*

Proceedings of 46th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams (HB 2010) (Internet), p.57 - 61, 2010/09

The Beam Based Alignment (BBA) of the BPM is inevitable for precise and absolute beam position measurements. Even though careful fabrication and installation of the BPM detector, it has to be calibrated by using the beam. Usually, it requires that the individual quadrupole magnet is able to be controlled. However, it is not always that case. In addition, scanning over the all BPM is time consuming procedure. The BBA method under coupled QM environment would help to reduce time for calibration. It presents general formula and experiences at J-PARC RCS and parts of results are compared with the ordinal method at J-PARC MR.

Journal Articles

Beam injection tuning of the J-PARC main ring

Wei, G.; Koseki, Tadashi*; Igarashi, Susumu*; Tomizawa, Masahito*; Takano, Jumpei*; Ishii, Koji*; Shirakata, Masashi*; Fan, K.*; Hatakeyama, Shuichiro; Uota, Masahiko*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.3915 - 3917, 2010/05

Journal Articles

Performance of the main ring BPM during the beam commissioning at J-PARC

Toyama, Takeshi*; Arakawa, Dai*; Hiramatsu, Shigenori*; Igarashi, Susumu*; Lee, S.*; Matsumoto, Hiroshi*; Odagiri, Junichi*; Tejima, Masaki*; Tobiyama, Makoto*; Hashimoto, Yoshinori*; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.981 - 983, 2010/05

Experiences of operating BPM's during beam commissioning at the J-PARC MR are reported. The subjects are: (1) bug report, statistics and especially the effect of a beam duct step, (2) position resolution estimation ($$<$$30 micrometers with 1 sec averaging), (3) beam based alignment.

Journal Articles

Beam fast extraction tuning of the J-PARC main ring

Wei, G.; Koseki, Tadashi*; Tomizawa, Masahito*; Igarashi, Susumu*; Ishii, Koji*; Ando, Ainosuke; Takano, Jumpei*; Uota, Masahiko*; Fan, K.*; Hatakeyama, Shuichiro; et al.

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.3918 - 3920, 2010/05

Journal Articles

Direct plasma injection scheme with beam extraction in a radio frequency quadrupole linac cavity

Kashiwagi, Hirotsugu; Okamura, Masahiro*; Tamura, Jun*; Takano, Jumpei*

Review of Scientific Instruments, 79(2), p.02C716_1 - 02C716_4, 2008/02

no abstracts in English

Journal Articles

Measurement of RF properties for beam extraction in an RFQ linac

Kashiwagi, Hirotsugu; Okamura, Masahiro*; Tamura, Jun*; Takano, Jumpei*

Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.739 - 741, 2007/00

no abstracts in English

Journal Articles

Acceleration of high current fully stripped carbon ion beam by direct injection scheme

Kashiwagi, Hirotsugu; Fukuda, Mitsuhiro; Okamura, Masahiro*; Jameson, R. A.*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Sakakibara, Kazuhiko*; Takano, Jumpei*; Yamamoto, Kazuo*; Iwata, Yoshiyuki*; et al.

Review of Scientific Instruments, 77(3), p.03B305_1 - 03B305_4, 2006/03

 Times Cited Count:12 Percentile:54.47(Instruments & Instrumentation)

Acceleration of a 17mA 100keV/u C$$^{6+}$$ ion beam has been successfully achieved with an RFQ linac by means of "Direct injection scheme". The Direct injection scheme is a new scheme for injecting an ion beam from a laser ion source to the RFQ linac without a low energy beam transport line to avoid a beam loss due to the space charge effect. The high current C$$^{6+}$$ beam is required for single turn injection to a synchrotron to reduce the size of synchrotron magnets. The high current C$$^{6+}$$ beam produced by an ion source with a Nd-YAG laser was injected to the RFQ linac by the Direct injection scheme. It has been proved experimentally that the fully-stripped carbon ion beam with a current more than 10mA can be accelerated by the RFQ linac.

Journal Articles

High current carbon beam production with direct plasma injection scheme

Okamura, Masahiro*; Kashiwagi, Hirotsugu; Sakakibara, Kazuhiko*; Takano, Jumpei*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Jameson, R. A.*; Yamamoto, Kazuo*

Review of Scientific Instruments, 77(3), p.03B303_1 - 03B303_3, 2006/03

 Times Cited Count:10 Percentile:49.28(Instruments & Instrumentation)

We have been studying a new heavy-ion production technique called "direct plasma injection scheme", DPIS, since 2000. A new radio frequency quadrupole "RFQ" designed especially for the DPIS was commissioned in 2004 and very intense carbon beam was successfully obtained, reaching more than 60 mA accelerated current from the RFQ. Most of the contents of the accelerated beam was carbon 4+ as verified by beam analysis.

Journal Articles

Acceleration of high current and highly charged carbon beam using direct injection scheme

Kashiwagi, Hirotsugu; Okamura, Masahiro*; Jameson, R. A.*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Sakakibara, Kazuhiko*; Takano, Jumpei*; Yamamoto, Kazuo*; Iwata, Yoshiyuki*; Fujimoto, Tetsuya*

Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.182 - 184, 2005/07

The carbon beam from a Nd-YAG laser ion source was accelerated successfully by an RFQ linac using Direct injection scheme. The "Direct injection scheme" is the way to inject an ion beam to the RFQ linac without a low energy beam transport line to avoid space charge effect due to a high intensity beam from the laser ion source. About 30mA of a carbon beam was detected by a faraday cup just behind the RFQ linac.

Oral presentation

Physics design and commissioning experience of J-PARC main ring injection and extraction

Wei, G.; Koseki, Tadashi; Igarashi, Susumu*; Takano, Jumpei*; Tomizawa, Masahito*

no journal, , 

Oral presentation

Development of human resources for research and development to support nuclear energy utilization

Kugo, Teruhiko; Hamada, Jumpei; Mineo, Hideaki; Okubo, Nariaki; Takano, Masahide; Matsumura, Tatsuro; Watanabe, Masayuki; Iwamoto, Osamu; Morita, Yasuji; Maekawa, Fujio

no journal, , 

The status of development of human resources in JAEA for research and development to support nuclear energy utilization is reported.

Oral presentation

Fundamental research on fission product chemistry, 1; Evaluation of oxidation and vaporization behavior of Boron compound formed in molten control rod blade

Imoto, Jumpei; Di Lemma, F. G.*; Miwa, Shuhei; Takano, Masahide; Osaka, Masahiko

no journal, , 

In order to investigate the Boron (B) release behavior from a Fe-B compounds formed in the melt of BWR control blade under a severe accident, a thermal analysis on a synthesized Fe-B sample was performed to evaluate the oxidation and vaporization behavior. It was found that the oxidation rate of the Fe-B compound was several magnitude of order lower than that of B$$_{4}$$C. This result support the previous report that the vaporization of B through the main release path of the oxidation product B$$_{2}$$O$$_{3}$$ is suppressed by the formation of Fe-B-O compounds in the case of Fe-B compounds.

Oral presentation

FP chemistry in a high temperature region of LWR under a severe accident, 3; Evaluation of chemical reaction during boron release from molten control blade

Imoto, Jumpei; Miwa, Shuhei; Takano, Masahide; Osaka, Masahiko

no journal, , 

In order to improve the boron release model from the molten BWR control blade under LWR severe accident, chemical reaction during the boron release was investigated experimentally. Thermal analysis of the Fe-B compound formed in molten control blade was carried out and the reaction products were analyzed. Fe-B-O compound was detected as reaction product at oxidation of the Fe$$_{2}$$B compound in 1200-1400K using X-ray diffraction. It was found that B release from Fe$$_{2}$$B occurred via oxidation formation of B$$_{2}$$O$$_{3}$$ and stable Fe-B-O compound.

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