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Kuramochi, Masaya*; Yamamoto, Kazami; Kinsho, Michikazu
JAERI-Tech 2003-055, 148 Pages, 2003/07
JAERI-Tech-2003-055.pdf:24.48MB
The injection beam dump of the 3 GeV rapid cycling synchrotron (3 GeV-RCS) is to be installed to absorb the H
and H
beams that can not be changed into H
beam with a graphite foil. We estimate the maximum temperature and thermal stress of the injection beam dump. As a result, the temperature at the center region made of iron reached up to 370 K after several operation cycles (one cycle is three-week operation including one-week interval) under the 1kW-beam injection. Then, the temperature at the boundary between the iron region of the beam dump and the concrete wall of the tunnel was rather low temperature of about 320 K. And the maximum Mises stresses of 96 MPa and about 0.2 MPa were generated in the iron region and the concrete wall respectively. These values were much lower than the allowable temperature and stresses.
; ; ; Matsuda, Shinzaburo; ;
JAERI-M 82-131, 28 Pages, 1982/09
no abstracts in English
; ; ; Matsuda, Shinzaburo;
JAERI-M 9599, 22 Pages, 1981/08
no abstracts in English
Yatsuka, Eiichi; Hatae, Takaki; Takeyama, Shigeharu; Bassan, M.*; Vayakis, G.*; Walsh, M.*; Itami, Kiyoshi
no journal, ,
In ITER, 10
pulses of 5-J laser will be injected during its operation for 20 years. It was concerned that the surface damage was induced due to high incident laser energy density if conventional beam dump would be used. JAEA has proposed and modified the detailed shape of a new type beam dump in which the laser energy is reflected numerous times and absorbed gradually due to low absorptance of the S-polarized light. The new type beam dump withstands 10 pulses injection while conventional beam dump withstands 10
pulses (100 seconds) injection. In order to verify this design for drastically extending the beam dump life time, laser resistance test for molybdenum that is the beam dump material was carried out. As expected in design, beam energy absorption density is dominant factor for laser induced damage. Moreover, it was confirmed that interlaminating the bent sheets and shims and their diffuse bonding enable to manufacture complicated shape of the beam dump as designed.