First electron temperature and density measurements of D-module plasma in GAMMA 10/PDX using Thomson scattering and microwave interferometer systems

A divertor simulation experimental module (D-module) in the tandem mirror GAMMA 10/PDX was used for the study of plasma detachment. In previous studies, it was difficult to measure far-upstream plasma parameters in the D-module, and only electrostatic probes on the target plate were used to perform electron temperature and density measurements. To study the detached plasma structure, a Thomson scattering (TS) system and a microwave interferometer system have been installed to measure the inside plasma parameters of the D-module, and a movable electrostatic probe has been placed at the inlet of the D-module to measure the inlet plasma density and temperature. The TS system in the central cell observed the electron temperature and density of the core plasma simultaneously. These measurements revealed the entire density and temperature structure from the core plasma to the divertor plate. The line average electron density measured by the microwave interferometer showed a rollover behavior during detachment. The results indicated that the ionization region was located around the center of the D-module, and it appears to move upstream along the axis.

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Study of detached plasma profile in the divertor simulation experimental module of tandem mirror GAMMA 10/PDX

Yoshikawa

Kohagura

Ezumi

et al. 2021

AIP Advances

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Behavior of detached simulation plasma by suddenly changed particle flux in GAMMA 10/PDX

Yoshikawa,

Kohagura,

Ezumi

et al. 2024

AIP Advances

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Plasma detachment is one of the most significant factors affecting nuclear fusion reactors. GAMMA 10/PDX has a divertor simulation experimental module (D-module) for detached plasma studies in the end region. To investigate the effect of suddenly changing the higher-density particle flux into the detached plasma condition, similar to edge-localized mode simulations, we performed supersonic molecular beam injection (SMBI) and electron cyclotron heating (ECH) experiments to produce a higher-density and higher-temperature core plasma and introduced it to the divertor simulation plasma in the D-module. With the application of ECH, the detached plasma moved to the attached condition. Moreover, with the injection of SMBI into the ECH-injected plasma, the attached plasma moved to a detached condition. This study revealed the effect of sudden changes in the particle flux on detached simulation plasma for the first time.

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First electron temperature and density measurements of D-module plasma in GAMMA 10/PDX using Thomson scattering and microwave interferometer systems

Cited by 2 publications

References 13 publications

Study of detached plasma profile in the divertor simulation experimental module of tandem mirror GAMMA 10/PDX

Study of detached plasma profile in the divertor simulation experimental module of tandem mirror GAMMA 10/PDX

Behavior of detached simulation plasma by suddenly changed particle flux in GAMMA 10/PDX

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