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beam with Nd:YAG laser in J-PARCTomisawa, Tetsuo; Akikawa, Hisashi; Sato, Susumu; Ueno, Akira; Kondo, Yasuhiro; Oigawa, Hiroyuki; Sasa, Toshinobu; Hasegawa, Kazuo; Lee, S.*; Igarashi, Zenei*; et al.
Proceedings of 7th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators (DIPAC 2005), p.275 - 277, 2005/00
The photo neutralization method with Nd:YAG laser for negative hydrogen ions has been expected as an available candidate for the transverse beam profile measurement. The fraction of photo detached electron can also be used for charge exchange procedure to extract very low power proton beam for Transmutation Experimental Facility in J-PARC. The laser system has advantages of maintenance and radiation hardness in high intensity proton accelerators. In order to establish the low power beam extraction system and beam profile monitor, the photo neutralization efficiency must be surveyed in practical beam line with high intensity H beam. In this paper, an experimental set-up and preliminary results of photo neutralization method for intense H beam in J-PARC MEBT1 are described.
Terada, Hiroaki; Ueda, Hiromasa*; Wang, Z.*
Proceedings of 7th International Joint Seminar on the Regional Deposition Processes in the Atmosphere, p.115 - 122, 2001/11
The neutralization of acid rain by yellow-sand in East Asia was investigated numerically by an Air Quality Prediction Modeling System (AQPMS). AQPMS consists of advection, diffusion, dry and wet deposition, gas-phase chemistry and the liquid-phase chemistry. Different from the previous ones for Sahara and Australian deserts, a new deflation module of the yellow-sand was designed here, and this module was linked to the AQPMS. Firstly, for model validation, predicted various values were compared with measured values at atmospheric monitoring stations, and a reasonable agreement was obtained for April 1995. Secondly, a sensitivity experiment about chemical effects of yellow-sand was made and the result of it exhibited a strong neutralization of the precipitation by the yellow-sand. The monthly mean pH values in the northern China showed a remarkable increase of 0.6-1.8 by neutralization effect of the yellow-sand, while the increases in the southern China were less than 0.1. Even in Korea and Japan the yellow-sand caused the increase of the pH value of rain by 0.1-0.2.
Kashiwagi, Mieko; Okumura, Yoshikazu; Hanada, Masaya; Morishita, Takatoshi; Watanabe, Kazuhiro; Orita, Yoshitaka*; Horiike, Hiroshi*; Ido, Shuji*
JAERI-Tech 2001-046, 19 Pages, 2001/06
JAERI-Tech-2001-046.pdf:1.79MB
no abstracts in English
