Characteristics of Magnetized Coaxial Plasma Gun for Simulation Experiment of Thermal Transient Events in ITER

Author

Kikuchi, Yusuke ; Nakanishi, Ryota ; Nakatsuka, Motoaki ; Fukumoto, Naoyuki ; Nagata, Masayoshi

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of Hyogo, Himeji, Japan

Volume

38

Issue

3

fYear

2010

fDate

3/1/2010 12:00:00 AM

Firstpage

232

Lastpage

236

Abstract

A compact-sized magnetized coaxial plasma gun (MCPG) with a single discharge stage is developed in order to simulate transient heat loads such as type I edge-localized modes (ELMs) in ITER. The MCPG produces hydrogen plasmas with an electron density of 1- 4 ?? 10²¹ m^-3, an ion energy of 15 eV and a pulsewidth of 0.5 ms. It is found that the absorbed energy density measured by a calorimeter reaches 0.9 MJ/m² which is comparable with a transient heat load of type I ELMs expected in ITER. Erosion of tungsten due to the plasma irradiation produced by the MCPG is confirmed only at the edge parts of the specimen in this experiment.

Keywords

Tokamak devices; calorimetry; discharges (electric); hydrogen; plasma density; plasma diagnostics; plasma instability; plasma simulation; H; ITER; absorbed energy density; calorimeter; edge-localized modes; electron density; electron volt energy 15 eV; hydrogen plasmas; ion energy; magnetized coaxial plasma gun; plasma irradiation; single discharge stage; thermal transient events; transient heat loads; tungsten erosion; Divertor; ITER; magnetized coaxial plasma gun (MCPG); transient heat load; tungsten;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2009.2034378

Filename

5340524