First results of an auxiliary electron cyclotron resonance heating experiment in the GDT magnetic mirror

Bagryansky, P. A.; Kovalenko, Yu. V.; Savkin, V. Ya.; Solomakhin, A. L.; Yakovlev, D. V.

doi:10.1088/0029-5515/54/8/082001

Cited by 26 publications

(25 citation statements)

References 16 publications

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“…The peaked temperature profile suggests that the microwave power is deposited inside the central region with characteristic radius ∼ 5 cm leaving the peripheral plasma intact. This is in contradiction both to the initial theorecical work [11] and the low-power experiment [12] in 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 …”

Section: Resultsmentioning

confidence: 73%

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Threefold Increase of the Bulk Electron Temperature of Plasma Discharges in a Magnetic Mirror Device

et al. 2015

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We demonstrate plasma discharges with extremely high temperature of bulk electrons at the large axially symmetric magnetic mirror device GDT (Budker Institute, Novosibirsk). According to Thomson scattering measurements, the on-axis electron temperature averaged over several sequential shots is 660 ± 50 eV with peak values exceeding 900 eV in few shots. This corresponds to at least threefold increase as compared to previous experiments both at the GDT and at other comparable machines, thus demonstrating the maximum quasi-stationary (∼ 1 ms) electron temperature achieved in open traps. The breakthrough is made possible with application of sophisticated electron cyclotron resonance heating in addition to standard heating by neutral beams. The reported increase of the electron temperature along with previous experiments, which demonstrated highdensity plasma confinement with β ≈ 60%, provide a firm basis for extrapolating to fusion relevant applications of open magnetic systems.

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Section: Resultsmentioning

confidence: 73%

“…Experiments in such conditions resulted in the on-axis electron temperature of 400 − 450 eV [12]. In this letter we report the experiment in which we adopt another strategy.…”

Section: The Gas Dynamic Trapmentioning

confidence: 99%

Threefold Increase of the Bulk Electron Temperature of Plasma Discharges in a Magnetic Mirror Device

et al. 2015

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“…Along their way to the first harmonic EC resonance, the waves experience strong refraction, which is determined by the particular magnetic field distribution and plasma density profile. Oblique propagation of microwave beam in a highly refractive plasma leads to remarkably reach and rather unusual for a linear device ECRH physics that has been studied recently in [23][24][25][26].…”

Section: The Gas Dynamic Trap Devicementioning

confidence: 99%

Electron cyclotron plasma startup in the GDT experiment

et al. 2016

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The paper reports on a new plasma startup scenario in the Gas Dynamic Trap (GDT) magnetic mirror device. The primary 5 MW neutral beam injection (NBI) plasma heating system fires into a sufficiently dense plasma target ("seed plasma"), which is commonly supplied by an arc plasma generator. In the reported experiments, a different approach to seed plasma generation is explored. One of the channels of the electron cyclotron resonance (ECR) heating system is used to ionize the neutral gas and build up the density of plasma to a level suitable for NBI capture. After a short transition (about 1 ms) the discharge becomes essentially similar to a standard one initiated by the plasma gun. The paper presents the discharge scenario and experimental data on the seed plasma evolution during ECR heating, along with the dependencies on incident microwave power, magnetic configuration and pressure of a neutral gas. The characteristics of consequent high-power NBI discharge are studied and differences to the conventional scenario are discussed. A theoretical model describing the ECR breakdown and the seed plasma accumulation in a large scale mirror trap is developed on the basis of the GDT experiment.

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“…Recently, efficient ECRH of a relatively dense plasma has been demonstrated in the large-scale axially symmetric mirror device GDT (gas-dynamic trap) in the Budker Institute of Nuclear Physics [7][8][9][10][11] . In these experiments, a combined plasma heating by neutral deuterium beams (total power up to 5 MW) and microwave radiation (700 kW) results in the record for open traps bulk electron temperatures up to 1 keV at density about 10 13 cm -3 , thus demonstrating plasma parameters comparable to those in toroidal systems 10 .…”

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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First results of an auxiliary electron cyclotron resonance heating experiment in the GDT magnetic mirror

Cited by 26 publications

References 16 publications

Threefold Increase of the Bulk Electron Temperature of Plasma Discharges in a Magnetic Mirror Device

Threefold Increase of the Bulk Electron Temperature of Plasma Discharges in a Magnetic Mirror Device

Electron cyclotron plasma startup in the GDT experiment

Electron cyclotron emission at the fundamental harmonic in GDT magnetic mirror

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