Výsledky vyhledávání

High-speed emittance measurements for beams extracted from J-PARC RF ion source

Autor: K. Nanmo, M. Wada, H. Oguri, K. Shinto, K. Ikegami, K. Ohkoshi, T. Shibata

Publikováno v: SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020).

Oscillation of emittance and Twiss parameters in the negative ion (H−) beam from the J-PARC 2MHz RF ion source is measured by application of a double-slit emittance monitor located at the RFQ entrance. The emittance monitor is equipped with a newly

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f83cc955008ac2267707d32ea244a48
https://doi.org/10.1063/5.0057418

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Soundness evaluation of J-PARC RF ion source after 5-month continuous operation

Autor: T Shibata, K Ohkoshi, K Shinto, K Nanmo, K Ikegami, H Oguri

Publikováno v: Journal of Physics: Conference Series. 2244:012041

In the J-PARC user operation from Nov. 2020 – Apr. 2021, continuous operation of J-PARC Radio Frequency (RF) negative hydrogen ion (H-) source up to 3,651 hours (5 months) has been achieved. The ion source was operated with the output H- current of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::384b18a0076fbf61a74c09622f9660aa
https://doi.org/10.1088/1742-6596/2244/1/012041

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Akademický článek

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How to make extraction electrode current lower than beam and corresponding beam qualities in J-PARC cesiated RF-Driven Hˉ ion source 66 mA operation

Autor: K. Ikegami, H. Oguri, K. Ohkoshi, A. Takagi, K. Shinto, Akira Ueno

Publikováno v: AIP Conference Proceedings.

The beam brightness of the Japan Proton Accelerator Research Complex cesiated RF-driven H− ion source has been increased by using several unique measures, such as a low plasma electrode temperature operation, slight H2Os feeding in hydrogen plasma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::894a4df536dedb9323998383688aca62
https://doi.org/10.1063/1.5053300

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Akademický článek

Status of the Japan Proton Accelerator Research Complex H^{-} ion source

Autor: H. Oguri, A. Ueno, K. Ikegami, Y. Namekawa, K. Ohkoshi

Publikováno v: Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 1, p 010401 (2009)

A cesium-free H^{-} ion source driven by a LaB_{6} filament is being operated for the beam commissioning of the accelerators at Japan Proton Accelerator Research Complex (J-PARC). The beam commissioning started in November 2006. As of June 2008, ther

Externí odkaz: https://doaj.org/article/b60c84ac5e5e448fbfa40e9e32713efb

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Emittance improvements of cesiated RF-driven H− ion source to enable 60 mA operation of high-energy and high-intensity LINACs by plasma impurity controls

Autor: K. Ikegami, K. Ohkoshi, A. Takagi, Akira Ueno, H. Oguri

Publikováno v: AIP Conference Proceedings.

At the Japan Proton Accelerator Research Complex (J-PARC), the operation of a 400-MeV linear accelerator (LINAC) with an extraction H− ion beam intensity of 60 mA is under investigation. This intensity is 20 % higher than the 50 mA achieved by the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::620ccc0c3694b26584b9b4ef4a78f8d1
https://doi.org/10.1063/1.4995731

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High density plasma calculation of J-PARC RF negative ion source

Autor: H. Asano, K. Ikegami, K. Nanmo, A. Takagi, K. Ohkoshi, T. Shibata, K. Shinto, H. Oguri, F. Naito, Akira Ueno

Publikováno v: AIP Conference Proceedings.

Ignition and steady state phases of Radio Frequency (RF) plasma in J-PARC ion source has been investigated by numerical modeling. The model takes into account the transport of plasma particles (electrons, protons, hydrogen molecular ions and cesium i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5e576a41a94b6929e3afae16af8099ff
https://doi.org/10.1063/1.4995737

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Transverse RMS emittance evaluation based upon explicit and reasonable definitions of 100% and 95% beams

Autor: A. Takagi, K. Ikegami, Akira Ueno, K. Ohkoshi, H. Oguri

Publikováno v: AIP Conference Proceedings.

In order to compare brightnesses of beams produced by different ion sources, a transverse emittance evaluation procedure with consistency and small ambiguity for different background noises is required. The procedure to evaluate emittances of beams p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a1ebee7081407e06c052a99ad33487f
https://doi.org/10.1063/1.4995772

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Upgrade of the 3-MeV Linac for testing of Accelerator Components at J-PARC

Publikováno v: Journal of Physics: Conference Series. 1350:012077

We have upgraded a 3-MeV linac at J-PARC. The ion source is same as the J-PARC linac’s, and the old 30-mA RFQ is replaced by a spare 50-mA RFQ, therefore, the beam energy is 3 MeV and the nominal beam current is 50 mA. The main purpose of this syst

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e689f8d7e1d98cc8989071672cabcf1
https://doi.org/10.1088/1742-6596/1350/1/012077

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Status of the RF-driven H⁻ ion source for J-PARC linac

Autor: A. Takagi, Kiyoshi Ikegami, T. Shibata, Hidetomo Oguri, Akira Ueno, H. Asano, K. Ohkoshi

Publikováno v: The Review of scientific instruments. 87(2)

For the upgrade of the Japan Proton Accelerator Research Complex linac beam current, a cesiated RF-driven negative hydrogen ion source was installed during the 2014 summer shutdown period, with subsequent operations commencing on September 29, 2014.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc3ebb2a88f04bf414e7260a5d7c2d1c
https://pubmed.ncbi.nlm.nih.gov/26932020

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