HB2014 - List of Authors (Hashimoto, Y.)

Paper

Title

Page

Two-Dimensional and Wide Dynamic Range Profile Monitor Using OTR / Fluorescence Screens for Diagnosing Beam Halo of Intense Proton Beams

187

Y. Hashimoto, M. Tejima, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
A. Akino, Y. Omori, S. Otsu, H. Sakai
Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
T.M. Mitsuhashi
KEK, Ibaraki, Japan

An instrument which can diagnose a two-dimensional beam profile of the beam core together with the beam halo in wide dynamic range has been developed in the J-PARC. The instrument consists of OTR (Ti foil of 10 μm) screen, fluorescence (Cr doped alumina) screen, an Offner type imaging system, and a camera with image intensifier. The beam core is observed with OTR and the beam halo is observed with fluorescence screen, respectively. A combination of observations of beam core and halo with these two different screens that have different sensitivities allowed us an observation in wide-dynamic range. The four fluorescence screens are set in vertical and horizontal arrangement. Both the OTR and fluorescence are focused by an Offner type optics having a very wide incident pupil makes these images. This instrument is set in the beam transport line between the rapid cycling synchrotron and the main ring. A two dimensional profile of the beam core and the halo were successfully observed in six order of magnitude at projected plane using intense 3 GeV proton beams of 1.5 x 10¹³ protons. This monitor has a big advantage for the diagnostic of beam core and halo shapes in real space.
[1] Y. Hashimoto, et al., A Development of High Sensitive Beam Profile Monitor Using Multi-Screen, Proc. IBIC2013, 338-341.

Slides TUO2AB04 [3.172 MB]

WEO2AB03

Beam Instrumentation at the 1 MW Proton Beam of J-PARC RCS

278

K. Yamamoto, H. Harada, S. Hatakeyama, N. Hayashi, H. Hotchi, K. Okabe, P.K. Saha, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
Y. Hashimoto, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Rapid Cycling Synchrotron(RCS) of Japan Proton Accelerator Complex(J-PARC) is providing more than 300 kW of proton beam to Material and Life science Facility(MLF) and Main Ring(MR). Last summer shutdown, a new ion source was installed to increase output power to 1 MW. In order to achieve reliable operation of 1 MW, we need to reduce beam loss as well. Beam quality of such higher output power is also important for users. We present beam monitor systems for these purposes.

Slides WEO2AB03 [3.242 MB]

Paper	Title	Page
TUO2AB04	Two-Dimensional and Wide Dynamic Range Profile Monitor Using OTR / Fluorescence Screens for Diagnosing Beam Halo of Intense Proton Beams	187
	Y. Hashimoto, M. Tejima, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan A. Akino, Y. Omori, S. Otsu, H. Sakai Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan T.M. Mitsuhashi KEK, Ibaraki, Japan
	An instrument which can diagnose a two-dimensional beam profile of the beam core together with the beam halo in wide dynamic range has been developed in the J-PARC. The instrument consists of OTR (Ti foil of 10 μm) screen, fluorescence (Cr doped alumina) screen, an Offner type imaging system, and a camera with image intensifier. The beam core is observed with OTR and the beam halo is observed with fluorescence screen, respectively. A combination of observations of beam core and halo with these two different screens that have different sensitivities allowed us an observation in wide-dynamic range. The four fluorescence screens are set in vertical and horizontal arrangement. Both the OTR and fluorescence are focused by an Offner type optics having a very wide incident pupil makes these images. This instrument is set in the beam transport line between the rapid cycling synchrotron and the main ring. A two dimensional profile of the beam core and the halo were successfully observed in six order of magnitude at projected plane using intense 3 GeV proton beams of 1.5 x 10¹³ protons. This monitor has a big advantage for the diagnostic of beam core and halo shapes in real space. [1] Y. Hashimoto, et al., A Development of High Sensitive Beam Profile Monitor Using Multi-Screen, Proc. IBIC2013, 338-341.
	Slides TUO2AB04 [3.172 MB]

WEO2AB03	Beam Instrumentation at the 1 MW Proton Beam of J-PARC RCS	278
	K. Yamamoto, H. Harada, S. Hatakeyama, N. Hayashi, H. Hotchi, K. Okabe, P.K. Saha, M. Yoshimoto JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Hashimoto, T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Rapid Cycling Synchrotron(RCS) of Japan Proton Accelerator Complex(J-PARC) is providing more than 300 kW of proton beam to Material and Life science Facility(MLF) and Main Ring(MR). Last summer shutdown, a new ion source was installed to increase output power to 1 MW. In order to achieve reliable operation of 1 MW, we need to reduce beam loss as well. Beam quality of such higher output power is also important for users. We present beam monitor systems for these purposes.
	Slides WEO2AB03 [3.242 MB]