Measurements of the Plasma Parameters in the D-Module of GAMMA 10/PDX during Impurity Gas Kr Injection

Abstract

This paper investigates the impact of Krypton (Kr) seeding on plasma parameters in the D-module of GAMMA 10/PDX experimentally based on the calorimeter, Langmuir probe and high-speed camera measurements. The heat flux distribution along the V-shaped target plate reduces with the increasing Kr injection. The time behavior of ion flux shows that it decreases with the increase of Kr seeding. The electron temperature (T e ) reduces significantly due to Kr seeding into the D-module. The electron density shows a so-called roll-over phenomenon during Kr seeding. The heat and ion fluxes reduce with the increasing Kr seeding into the D-module. Two-dimensional images captured by the high-speed camera also show that the emission intensity significantly reduces inside the V-shaped target at the higher Kr injection. These outcomes represent the impact of Kr seeding for generating the detached plasma.

Study of end-cell plasma parameters of GAMMA 10/PDX by the LINDA code

“…The open magnetic plasma confinement device GAMMA 10/PDX is the world's largest tandem mirror device. The device has been designed with a central-cell, anchor-cells, plug/barrier-cells and end-cells to study the mirror confinement plasma physics [10][11][12][13][14]. The central-cell of the device is considered to be the main plasma heating and confinement cell.…”

“…The features of GAMMA 10/PDX for the divertor simulation studies are: (1) high parallel ion temperature (∼100-400 eV), (2) high electron temperature (∼30 eV), (3) simple geometry to install plasma diagnostics tools, and (4) robust plasma heating systems. In GAMMA 10/PDX, a divertor simulation experimental module (Dmodule) has been installed in the west end-cell to study the divertor plasma physics [10][11][12][13][14]. Two tungsten targets are designed in V-shape inside the module.…”

“…molecular activated recombination (MAR)). The divertor research has been extensively performed by using the D-module of GAMMA 10/PDX for understanding divertor plasma physics [10][11][12][13][14]. More detailed description of the experimental setup is discussed in the [10][11][12][13][14].…”

“…The divertor research has been extensively performed by using the D-module of GAMMA 10/PDX for understanding divertor plasma physics [10][11][12][13][14]. More detailed description of the experimental setup is discussed in the [10][11][12][13][14]. In this paper, the effect of H and Ar puffing on the energy loss processes is numerically investigated by the LINDA code.…”

Study of the Transient Behavior of Detached Plasma during Xe Gas Injection into the D-Module of GAMMA 10/PDX

“…The plasma heating tools such as Neutral Beam Injection (NBI), Ion Cyclotron Range of Frequency (ICRF), and Electron Cyclotron Heating (ECH) have been installed on the GAMMA 10/PDX to heat the plasma. By using the end-loss plasma, the divertor simulation research is performed at the west end-cell of the device [6][7][8][9][10]. A numerical simulation study is also performed by using the LINDA code [11][12][13][14][15][16].…”