Research plan for divertor simulation making use of a large tandem mirror device

Nakashima, Y.; Ichimura, M.; Katanuma, I.; Yoshikawa, Masayuki; Kariya, T.; Minami, R.; Kiwamoto, Y.; Miyata, Yasumitsu; Satō, Hiroyuki; Yamaguchi, Yusuke; Yonenaga, R.; Takeda, H.; Imai, T.

doi:10.1016/j.fusengdes.2010.09.015

Cited by 38 publications

(26 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the tandem mirror device GAMMA 10/PDX in University of Tsukuba, divertor simulation experiments were conducted for analyzing physical mechanism of detachment plasma [1][2][3]. The divertor simulation experimental module (D-module), in which a V-shaped target is mounted, was installed in the west end-cell of GAMMA 10/PDX.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of heat flux from the plasma flow by using calorimeter in the GAMMA 10/PDX end-cell

Ohuchi¹,

Nakashima²,

Matsuura³

et al. 2016

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. In this paper, detailed results of the heat flux measurements are presented and the improvement of heat flux evaluation method is also discussed. We measured the heat flux in the case that additional heating with electron cyclotron resonance heating (ECRH).The heat flux reaches about 17 MW/m 2 in the case with ECRH power 380kW. It is found that solving one-dimensional inverse heat conduction problems provides a possibility of improving time response of the heat flux measurement under the condition of changing heat flux in 20Hz.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of heat flux from the plasma flow by using calorimeter in the GAMMA 10/PDX end-cell

Ohuchi¹,

Nakashima²,

Matsuura³

et al. 2016

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…This divertor plasma simulator is called E-Divertor and various experimental activities have been extensively performed since 2008 [3][4][5][6][7][8]. So far, in the E-divertor research, we have investigated characteristics of high heat and particle fluxes produced at the end-mirror exit and both the ion temperature of 100~400 eV and the particle flux of 10 22 particles/s•m 2 were achieved by using ICRF wave [6].…”

Section: Introductionmentioning

confidence: 99%

Overview of recent progress and future in GAMMA 10/PDX project

Nakashima

Imai

Sakamoto

et al. 2016

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. This paper presents an overview of the recent progress of GAMMA 10/PDX project. In the GAMMA 10/PDX project, development of fusion reactor relevant research related to magnetic mirror devices has been conducted. One of the main objectives is divertor simulation studies under the similar condition of actual fusion devices, which contributes to comprehensive development strategy towards the divertor plasma physics and plasma wall interaction (PWI) studies. The recent progress of this research is that an additional plasma heating (ICRF and ECH) significantly increased the ion flux up to 3.3×10 23 /m 2 s at the end-mirror exit, which proved an effectiveness of additional plasma heating for generating high ion flux from the mirror end. Superimposing a short pulse of ECH produces the maximum heat flux of 21 MW/m 2 by improving the west plug ECH antenna system, which exceeds the heat-load of ITER divertor plates. In detached plasma formation experiments using the divertor simulation experimental module (D-module), comparison of various radiator gases (Xe, Ar, Ne, N 2 ) injected into D-module showed that Xe was the most effective gas on electron cooling and reduction of heat and ion fluxes. In the development of high-power gyrotrons, a number of electron cyclotron heating experiments using high-power gyrotrons have been performed under strong collaboration and we made a remarkable contribution to LHD and QUEST. The first 28 GHz MW tube has attained 1.38 MW and new MW-level dual frequency gyrotron test is also in progress and 1.22 MW at 28GHz is achieved. Multi-channel/multi-pass Thomson scattering system has been developed and simultaneous measurement of radially 6 points with 10 Hz can be available. The multi-pass function of this system also improved the measurement accuracy and time resolution. Microwave interferometer system has been developed in the GAMMA 10/PDX end-cell, which contributes to detailed diagnostics for divertor simulation plasmas in D-module.

show abstract

“…In the large tandem mirror device GAMMA 10/PDX, divertor simulation experiments have been conducted using an end region with an open magnetic field configuration [2][3][4]. One of the advantages of GAMMA 10/PDX over other small divertor simulators is existence of confined core plasma with high ion and electron temperatures up to ∼10 keV and ∼100 eV, respectively [5].…”

Section: Introductionmentioning

confidence: 99%

Measurements of Electron Temperature and Density Distribution on a V-Shaped Target of a Divertor Simulation Experimental Module in GAMMA 10/PDX

Oki

Sakamoto

Nakashima

et al. 2015

Plasma and Fusion Research

View full text Add to dashboard Cite

Spatial distributions of electron temperature and density have been measured using Langmuir probes on a tungsten V-shaped target plate of a divertor simulation experimental module in GAMMA 10/PDX. In standard hot-ion plasmas, the electron temperature is about 30-50 eV, which is comparable to that in confined core plasmas. The electron density is on the order of 10 16 m −3 but increases about 3 times owing to additional ion cyclotron range of frequency heating. In a direction along the target plate toward the corner, the electron temperature seems to slightly decrease toward the corner. In another direction perpendicular to this direction, the electron temperature profile seems to be roughly flat. The profile of electron density compensated for the expansion of magnetic flux tubes is similar to the core plasma, but the compensated density decreases near the corner. As the open angle of the target decreases, the compensated density decreases although the electron temperature does not change much. These density decreases may be due to increase in flow velocity caused by electric and pressure forces in the pre-sheath.

show abstract

Research plan for divertor simulation making use of a large tandem mirror device

Cited by 38 publications

References 16 publications

Evaluation of heat flux from the plasma flow by using calorimeter in the GAMMA 10/PDX end-cell

Evaluation of heat flux from the plasma flow by using calorimeter in the GAMMA 10/PDX end-cell

Overview of recent progress and future in GAMMA 10/PDX project

Measurements of Electron Temperature and Density Distribution on a V-Shaped Target of a Divertor Simulation Experimental Module in GAMMA 10/PDX

Contact Info

Product

Resources

About