Experimental Results and Design of Mirror Antenna and MW Gyrotron for Control of High Intermittent Heat Flux in GAMMA 10 Tandem Mirror

Minami, R.; Imai, T.; Kariya, T.; Numakura, T.; Kato, Tatsuro; Uehara, Makoto; Goto, Ryohei; Tsumura, Kohei; Endo, Yukari; Ichimura, M.

doi:10.13182/fst14-869

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…However, for many years the use of this method in open magnetic configurations has been limited either to plasma heating in relatively compact laboratory installations 1 , or to MHD stabilization and generation of fast electron population in a low-density plasma [2][3][4][5] . The exception was the TMX-U experiment at Lawrence Livermore National Laboratory where electron temperatures up to 0.28 keV were obtained with ECR heating (ECRH), but these studies were terminated soon after that 6 .…”

Section: Introductionmentioning

confidence: 99%

Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror

et al. 2017

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New electron cyclotron emission (ECE) diagnostics has been installed to facilitate the successful experiment on electron cyclotron plasma heating (ECRH) experiment at the large open magnetic trap GDT in Budker Institute. The particularities of ECE in the vicinity of the ECRH frequency were studied experimentally for a broad range of discharge scenarios. Measured thermal emission has partly validated the existing physical conceptions about the microwave plasma heating in the machine. Besides expected emission of thermal electrons, a clearly resolved non-thermal ECE was observed what unambiguously confirmed the presence of suprathermal electrons driven by highpower microwave heating.

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Section: Introductionmentioning

confidence: 99%

Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror

et al. 2017

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“…Development of ECH system and MW-power gyrotrons for the divertor simulation studies has been performed as a tool of generation and control of high heat-flux plasma flow [17]. Study on ELM simulation is also one of important subjects of urgent in divertor and PWI research and it has been requested that the development of intermittent heat source corresponds to the heat level of GW/m 2 .…”

Section: Development Of Ech System Applied For Divertor Simulation Stmentioning

confidence: 99%

“…Thomson scattering (TS) diagnostic is a powerful method for measuring electron temperature and density plasmas and has been applied to low-density plasmas in the GAMMA 10/PDX edge region [16,17]. In order to improve the low signal to noise ratio, multi-pass TS has been proposed and continuous efforts for upgrading system have been continued.…”

Section: Introductionmentioning

confidence: 99%

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

Nakashima

Imai

Sakamoto

et al. 2016

AIP Conference Proceedings

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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.

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Experimental Results and Design of Mirror Antenna and MW Gyrotron for Control of High Intermittent Heat Flux in GAMMA 10 Tandem Mirror

Cited by 2 publications

References 9 publications

Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror

Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror

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

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