Abstract
The dynamic response to a particle flux in a divertor simulation plasma has been studied using electron cyclotron heating (ECH) in GAMMA 10/PDX. Hydrogen gas was supplied to the divertor simulation experimental module (D-module), and ECH was applied to the main plasma. The electron temperature (Te) decreased, and a rollover of electron density (ne) was observed upon an additional supply of hydrogen gas with and without ECH,which indicates that the plasma was detached. Moreover, the intensity of Hα (IHα) increased even though ne decreased with an increasing gas supply, indicating that the plasma detached due to molecular activated recombination (MAR). In the case of additional gas supply, ne increased, but Te was not affected by ECH. The ionization front moved to the upstream side, and the particle flux flowing into the D-module increased with ECH. The ratio of IHα to the intensity of Hβ (IHβ) near the corner of the V-shaped target increased with ECH, indicating that the MAR was enhanced near the corner. The intensity of the Fulcher-α Q1-branch increased near the corner of the V-shaped target with ECH, indicating that the density of hydrogen molecules was reduced by hydrogen recycling.
