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ionsShiina, Yoko*; Kinoshita, Ryo*; Funada, Shuhei*; Matsuda, Makoto; Imai, Makoto*; Kawatsura, Kiyoshi*; Sataka, Masao*; Sasa, Kimikazu*; Tomita, Shigeo*
Nuclear Instruments and Methods in Physics Research B, 460, p.30 - 33, 2019/12
Times Cited Count：2 Percentile：22.89(Instruments & Instrumentation)Yamamoto, Kazami; Shibata, Takeo*; Ogiwara, Norio; Kinsho, Michikazu
Vacuum, 81(6), p.788 - 792, 2007/02
Times Cited Count：13 Percentile：46.81(Materials Science, Multidisciplinary)The J-PARC 3GeV Rapid-Cycling Synchrotron (RCS) is required to provide 1MW pulsed protons to the spallation neutron target and the 50 GeV main ring. Since the acceleration period is set at a repetition rate of 25Hz, the eddy current effect due to such rapid repetition magnetic field is a big issue (i.e. the perturbation of the magnetic field and the heating owing to the ohmic loss) in the metal duct. Therefore, we choose the ceramics duct in the magnets in order to avoid the eddy current effect. But the total secondary electron emission yield (SEY) from the ceramics surface is larger than the metal one. In order to reduce these undesirable electron emitted from the chamber surface, Titanium Nitride (TiN) is coated on the inside surface of the chambers. We measured SEY from TiN coating surface with various conditions. We further investigated Diamond Like Carbon coating to search the possibility of another coating. The results of these measurements are shown.
Okumura, Susumu; Fukuda, Mitsuhiro; Ishibori, Ikuo; Arakawa, Kazuo
Review of Scientific Instruments, 73(1), p.51 - 55, 2002/01
Times Cited Count：1 Percentile：12.48(Instruments & Instrumentation)We have developed a time pickup system for monitoring the beam bursts from a cyclotron. The time pickup can measure the phase and the width of the beam bursts by detecting secondary electrons emitted from a foil or a wire target inserted into the beam with time resolutions around 200 ps FWHM (full width at half maximum) in spite of its simple structure. Using the foil and the wire targets appropriately, monitoring the bursts of variety of beams can be achieved. In addition, by adjusting the position of the target, enough detection rate of the beam burst is obtained with minimized interference with the beam. The present investigation shows that it is needed to adjust the collection voltage of the time pickup according to the purposes: the optimum collection voltages for high resolution measurement are in the range from -0.5 to -1.0 kV and those for high efficiency measurement are not less than -4.0 kV.
Kudo, Hiroshi*; Nakamura, Naoki*; Yamamoto, Shunya; Narumi, Kazumasa; Naramoto, Hiroshi
JAERI-Review 99-025, TIARA Annual Report 1998, p.185 - 187, 1999/10
no abstracts in English
Kudo, Hiroshi*; Sakamoto, Akihiko*; Yamamoto, Shunya; Aoki, Yasushi; Naramoto, Hiroshi; Inoue, Tomoyasu*; Sato, Msataka*; Yamamoto, Yasuhiro*; Umezawa, Kenji*; Seki, Seiji*
Japanese Journal of Applied Physics, Part 2, 35(11B), p.L1538 - L1541, 1996/11
no abstracts in English
Kudo, Hiroshi*; *; *; Takeshita, Hidefumi; Aoki, Yasushi; Yamamoto, Shunya; Naramoto, Hiroshi
Nuclear Instruments and Methods in Physics Research B, 90, p.533 - 536, 1994/00
no abstracts in English
Hiroki, S.; ; ; Murakami, Yoshio
Shinku, 30(1), p.14 - 21, 1987/01
no abstracts in English
Hiroki, S.; ; *; ; Murakami, Yoshio
JAERI-M 85-123, 23 Pages, 1985/08
no abstracts in English
ion impact effects on SiO, AlO
and MgO;
Journal of Nuclear Materials, 128-129, p.605 - 608, 1984/00
Times Cited Count：8 Percentile：65.31(Materials Science, Multidisciplinary)no abstracts in English
; Hotta, Hiroshi
Radiat.Res., 64(3), p.407 - 415, 1975/03
Times Cited Count：3no abstracts in English
Journal of the Physical Society of Japan, 37(5), P. 1469, 1974/05
no abstracts in English
