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Fusion Science and Technology
More from UWC 2020: Round 2
This year’s Utility Working Conference had a dynamic opening plenary and a packed roster of informative sessions. Following are recaps of some of the 2:00 p.m. (EDT) sessions that took place.
Don't miss Newswire's coverage of the opening plenary and the sessions at 12:00 pm.
K. Nojiri, M. Sakamoto, K. Oki, M. Yoshikawa, Y. Nakashima, M. Yoshikawa, A. Terakado, R. Nohara, M. Mizuguchi, T. Imai, M. Ichimura
Fusion Science and Technology | Volume 68 | Number 1 | July 2015 | Pages 120-124
Technical Paper | Open Magnetic Systems 2014 | dx.doi.org/10.13182/FST14-893
Articles are hosted by Taylor and Francis Online.
In GAMMA 10/PDX, the relationship between electron density and temperature of the divertor simulation plasma in the divertor simulation experimental module (D-module) and the density of the upstream plasma has been studied. As the amount of gas (H2 and Ar) injected into the D-module increases, the line-averaged electron density (ne_WP) of the west plug plasma (i.e., upstream plasma) increases due to gas flow from the D-module to the upstream. The electron temperature of the divertor simulation plasma monotonically decreases with increase in ne_WP. The electron density of the divertor simulation plasma becomes saturated against increase in ne_WP when the plasma is sustained only by the ion cyclotron heating. This may suggest a sign of the beginning of the density roll-over. Additional electron cyclotron heating to the upstream plasma increases the density of both the upstream plasma and the divertor simulation plasma, and the saturated density of the divertor simulation plasma recovers to a linear dependence on ne_WP, suggesting an enhanced ionization of neutral gases in the upstream and the D-module.