Plasma Spectral Measurements in the D-Module of the GAMMA 10/PDX End-Cell

Abstract

In this paper, results of spectral measurement in the end-cell of the GAMMA 10/PDX are described. A spectral measurement system consisting of two spectrometers was developed in order to measure the detailed radiation behavior in D-module. Firstly, angular dependence of the V-shaped target plate on the spatial distribution of the Hα radiance was investigated. It is found that the spectral distribution in Hα intensity along the axial direction is affected by the angle of the target plate. Next, in the experiment with H 2 and Ar gas injection, primary 17 line spectra of Ar I were identified and the radiation loss from Ar neutrals was also evaluated from intensity of spectra. A correlation between the power of radiation loss and the electron temperature in D-module are recognized. The correlation between radiation power and electron temperature is also discussed from the view point of radiation cooling.

Characteristics of SMBI fueling with laval nozzle in GAMMA 10 based on experimental and simulation results

“…Figure 2(b) shows the relationship between FWHM and plenum pressure of SMBI with Laval nozzle. The FWHM value with Laval nozzle is lower than that for the both cases with straight nozzle and without nozzle [5,6]. Besides, in all plenum pressure, the FWHM value is lower than the plasma diameter.…”

“…An SMBI experiment in GAMMA 10 has been performed by three conditions; without any nozzle, straight nozzle and Laval nozzle. The first experimental results of SMBI by both straight nozzle and without any nozzle showed that SMBI achieved higher density plasmas at the core region than the conventional gas puffing [5,6]. In addition, the penetration depth is high in the case of straight nozzle than without nozzle [6].…”

Sensitivity Check of Background Plasma Parameter during SMBI in the GAMMA 10 Central-Cell by 3-D Monte-Carlo Simulations

“…In magnetically confined plasmas, the proper control of gas fueling is very important issue. The supersonic molecular beam injection (SMBI) is an effective fueling method developed by L. Yao, et al [1] which can inject neutral particle deeper into the core plasma compared to conventional gas puffing [2,3]. SMBI system is very simple and economically feasible to develop.…”

“…eling method to produce high density plasmas [2,3]. Investigation of neutral particle behavior during SMBI is an important task for understanding the plasma-neutral interaction.…”

Study of the impurity transport by injecting the gas to D-module in GAMMA 10/PDX

“…The reduction of the heat load to the divertor plate by promoting the radiation cooling is an important subject to form the detached plasma [1][2][3].…”