Electron Temperature and Density Distributions in a Divertor Simulation Experimental Module with Gas Injection in GAMMA 10/PDX

In tandem mirror GAMMA 10/PDX, H 2 gas has been injected to a divertor simulation experimental module (D-module) for radiation cooling and detachment study. Electron temperature (T e ) and density (n e ) distributions have been measured by Langmuir probes in the D-module. With increase of H 2 gas am...

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Published inFusion science and technology Vol. 68; no. 1; pp. 81 - 86
Main Authors Oki, K., Sakamoto, M., Nakashima, Y., Yoshikawa, M., Nohara, R., Nojiri, K., Terakado, A., Mizuguchi, M., Ichimura, K., Takeda, H., Iwamoto, M., Hosoda, Y., Shimizu, K., Kohagura, J., Imai, T., Ichimura, M.
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.07.2015
Subjects
Corners
Density
Detachment
Electron temperature
Gas injection
Magnetic fields
Modules
Simulation
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Summary:In tandem mirror GAMMA 10/PDX, H 2 gas has been injected to a divertor simulation experimental module (D-module) for radiation cooling and detachment study. Electron temperature (T e ) and density (n e ) distributions have been measured by Langmuir probes in the D-module. With increase of H 2 gas amount, T e has decreased especially at the V-shaped target plate from 30-40 eV to 3-5 eV. Moreover, n e and ion saturation current I is have increased at the inlet but decreased at the target and had a steeper distribution toward the corner. These results suggest detachment. The movement of the ionization front to the upstream side with increase of the gas is suggested from the change in the plasma parameters profiles along the magnetic field line.
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ISSN:1536-1055
1943-7641
DOI:10.13182/FST14-896