High Beta and High Density Operation in TPE-RX

Haruhisa KOGUCHI; Hajime SAKAKITA; Satoru KIYAMA; Kiyoyuki YAMBE; Tomohiko ASAI; Yoichi HIRANO; Fulvio AURIEMMA; David TERRANOVA; Paolo INNOCENTE

doi:10.1585/pfr.4.022

Regular Articles

High Beta and High Density Operation in TPE-RX

Haruhisa KOGUCHI, Hajime SAKAKITA, Satoru KIYAMA, Kiyoyuki YAMBE, Tomohiko ASAI, Yoichi HIRANO, Fulvio AURIEMMA, David TERRANOVA, Paolo INNOCENTE

Author information

Haruhisa KOGUCHI
Energy Technology Research Institute (ETRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
Hajime SAKAKITA
Energy Technology Research Institute (ETRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
Satoru KIYAMA
Energy Technology Research Institute (ETRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
Kiyoyuki YAMBE
Energy Technology Research Institute (ETRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
Tomohiko ASAI
College of Science and Technology, Nihon University, Tokyo 101-8308, Japan
Yoichi HIRANO
Energy Technology Research Institute (ETRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
Fulvio AURIEMMA
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, corso Stati Uniti 4, 35127 Padova, Italy
David TERRANOVA
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, corso Stati Uniti 4, 35127 Padova, Italy
Paolo INNOCENTE
Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, corso Stati Uniti 4, 35127 Padova, Italy

Keywords: reversed-field pinch (RFP), pulsed poloidal current drive (PPCD), high-beta plasma, pellet injection

JOURNAL FREE ACCESS

2009 Volume 4 Pages 022

DOI https://doi.org/10.1585/pfr.4.022

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Abstract

A high poloidal beta, β_p, was achieved using pulsed poloidal current drive (PPCD) in a toroidal pinch experiment-RX (TPE-RX). The plasma electron density and temperature increased, hence improving β_p from 5 to 30% during PPCD. β_p is almost equal to the total beta in the reversed-field pinch (RFP). D-alpha emission from recycling deuterium by the plasma-wall interaction decreased during the PPCD. An improved particle confinement time was indicated by a ten fold increase in the ratio of the total number of particles to the D-alpha emission. Single pellet injection into the good particle confinement plasma, achieved by the PPCD, produced high density plasma with high beta values. The plasma electron density rapidly increased to triple that of standard plasma, and high density was maintained till the end of the PPCD period. The electron temperature was lower than that of PPCD without ice pellet injection, but β_p remained almost the same because the plasma electron density was higher with pellet injection.

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