Recent Results of Divertor Simulation Experiments Using D-Module in the GAMMA 10/PDX Tandem Mirror

Nakashima, Y.; Sakamoto, M.; Takeda, H.; Ichimura, Kazuya; Hosoda, Yasuhiro; Iwamoto, M.; Shimizu, Kazuya; Hosoi, K.; Oki, K.; Yoshikawa, Masayuki; Hirata, M.; Ikezoe, Ryuya; Imai, T.; Kariya, T.; Katanuma, I.; Kohagura, J.; Minami, R.; Numakura, T.; Wang, Xiaolong; Ichimura, M.

doi:10.13182/fst14-882

Cited by 24 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GAMMA 10/PDX is the largest tandem mirror device of the total length is 27 m. The volume of the vacuum vessel is 150 m 3 . At the central-cell, core plasmas (T i⊥ ∼4 keV, T e ∼100 eV and n e ∼10 18 m −3 ) are mainly generated by using ICRF (RF1 & 2) and gas puffing.…”

Section: Experimental Devicementioning

confidence: 99%

“…The plasma heating system neutral beam injection (NBI), electron cyclotron resonance heating (ECH) and ion cyclotron range of frequency (ICRF) have been installed in GAMMA 10/PDX [3,4]. The end loss flux which escapes from the centralcell, has been focused because of applicability and extensibility for studies that require high-performance plasma flux such as plasma-divertor interaction simulation experiments.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments

Yokodo

Nakashima

Hatayama

et al. 2018

Plasma and Fusion Research

View full text Add to dashboard Cite

Detailed results of spectral measurements in the gas injection performed in GAMMA 10/PDX divertor simulation experiments are presented. From the comparison of the emission intensity at the end-cell and plug/barriercell, impurity behavior along the magnetic field line is discussed in GAMMA 10/PDX. The emission intensity of Ar II is decreased due to the increase in the background plasma density and the end loss particle flux, which consequently suppresses the Ar particle transport towards the upstream region. The ECH in the plug-cell (EP-ECH) was applied to investigate the influence of the heating on the emission of injected impurities. Ar II intensity slightly increased EP-ECH. On the other hand, Kr II and Xe II decreased at the plug/barrier-cell.

show abstract

Section: Experimental Devicementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments

Yokodo

Nakashima

Hatayama

et al. 2018

Plasma and Fusion Research

View full text Add to dashboard Cite

show abstract

“…Detailed description of GAMMA 10/PDX has been provided elsewhere [1][2][3][4][5][6][7][8][9][10][11][12]. The magnetic field strength at the midplane of the central cell is 0.405 T, and the mirror ratio of the central cell is 5.…”

Section: Methodsmentioning

confidence: 99%

“…In the tandem mirror GAMMA 10/PDX, ion cyclotron range of frequency (ICRF) waves have been used for plasma production, heating, and sustaining magnetohydrodynamic stability [1,2]. A maximum ion temperature of 10 keV and a temperature anisotropy (defined as the temperature ratio between directions perpendicular, T ⊥ , and parallel, T // , to the magnetic field line) of more than 10 have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Electron Heating by Electron Landau Damping of Alfvén Ion Cyclotron Waves Using Thomson Scattering System in the Tandem Mirror GAMMA 10/PDX

Yoshikawa

Ikezoe

Ohta

et al. 2016

Plasma and Fusion Research

View full text Add to dashboard Cite

show abstract

“…We contribute to achieving the steady-state operation of detached plasma in ITER/Demo reactors by obtaining knowledge for the generation and stable control of detached plasma and investigating the mechanism of radiation cooling and impurity transport due to the radiator gas injection. Recently by the massive injection of hydrogen and noble gases, we have succeeded in achieving detached plasma formation in E-divertor region [10,11].…”

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

Recent Results of Divertor Simulation Experiments Using D-Module in the GAMMA 10/PDX Tandem Mirror

Cited by 24 publications

References 19 publications

Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments

Impact of the Upstream Plasma Parameters on the Spectroscopic Measurement in the GAMMA 10/PDX Divertor Simulation Experiments

Direct Observation of Electron Heating by Electron Landau Damping of Alfvén Ion Cyclotron Waves Using Thomson Scattering System in the Tandem Mirror GAMMA 10/PDX

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

Contact Info

Product

Resources

About