@misc{oai:repo.qst.go.jp:00066179,
 author = {坂本, 瑞樹 and 寺門, 明紘 and 野尻, 訓平 and 江角, 直道 and 大木, 健輔 and 中嶋, 洋輔 and 市村, 和也 and 福本, 正勝 and 吉川, 正志 and 小波蔵, 純子 and 今井, 剛 and 市村, 真 and 坂本 瑞樹 and 中嶋 洋輔 and 福本 正勝},
 month = {Aug},
 note = {In GAMMA 10/PDX, studies on the boundary plasma and plasma surface interaction have been done using the end region making best use of the tandem mirror device. The features of GAMMA 10/PDX for the boundary plasma and PSI studies are the following: (1) high ion temperature of the plasma exposed to the D-module (i.e. a few hundreds eV), (2) high magnetic field (0.15 ~ 1.5 T), (3) large plasma size (0.1 ~ 0.3 m), (4) low background pressure in the vacuum vessel and (5) high controllability of the plasma exposure since plasma heating systems of ECH, ICH and NBI are equipped. Noted that ion energy of the plasma is distributed, meaning that condition of PSI is equivalent to that of the torus plasma from a viewpoint of hydrogen recycling.
\nThe divertor simulation experimental module (D-module) has been installed in the west end region. The D-module consists of a rectangular box (0.5 m square and 0.7 m in length) with an inlet aperture at the front panel and a V-shaped target inside the box. Tungsten target plates with the thickness of 0.2 mm are attached on the V-shaped base made of Cu. The target size is 0.3 m in width and 0.35 m in length. The open-angle of the V-shaped base can remotely be changed from 15 degrees to 80 degrees. The sheath electric heaters are attached on the backside of the Cu base to control the target temperature  up to 573 K. Besides, additional hydrogen gas can be supplied into the D-module.
\nThe V-shaped tungsten target in the D-module is exposed to the end loss plasma. The effect of additional hydrogen gas supply into the D-module on the recycling is investigated. The density roll-over due to the additional gas supply has clearly been observed, indicating that the plasma near the target is detached. The dependence of the H alpha and H beta line intensities on the neutral pressure suggests that molecular activated recombination (MAR) occurred near the corner of the V-shaped target. When the target temperature was increased upto 573 K shot by shot in another experiment, it is found that the intensities of balmer lines inside the V-shaped target and the electron density increased with increase in the target temperature, indicating that the recycling was enhanced due to increase in the target temperature., 11th International Conference on Open Magnetic Systems for Plasma Confinement},
 title = {Hydrogen recycling study utilizing end region in the GAMMA 10/PDX tandem mirror},
 year = {2016}
}