Ichimura K, Fukumoto M, Islam M M, Islam M S, Shimizu K, Fukui K, Ohuchi M, Nojiri K, Terakado A, Yoshikawa M, Ezumi N, Sakamoto M, Nakashima Y
Plasma Research Center, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, Japan.
National Institutes for Quantum and Radiological Science and Technology, 801-1 Mukouyama, Naka, Ibaraki, Japan.
Rev Sci Instrum. 2016 Nov;87(11):11D424. doi: 10.1063/1.4960536.
In the divertor simulation experiments in the GAMMA 10/PDX tandem mirror, pressure of the neutral gas was investigated by using a fast ionization gauge. The gauge was absolutely calibrated for hydrogen gas by using a capacitance manometer. Change of the gauge sensitivity due to the magnetic field of GAMMA 10/PDX was also evaluated. The typical gas pressure measured in detached plasma experiments was 0.1-10 Pa. The degree of plasma detachment determined from the reduction of heat flux was enhanced as the gas pressure increases. Rapid increase of the gas pressure under the plasma flow was also observed.
