Second harmonic electron cyclotron current drive experiments on T-10

Alikaev, V. V.; Bagdasarov, A.A.; Borshegovskij, A. A.; Chistyakov, V. V.; Dremin, M. M.; Gorelov, Ya; Gorshkov, A. V.; Y, Esipchuk,; Evdokimov, D. B.; Kislov, A. Ya.; Kislov, D. A.; Krupin, V.A.; Kuznetsova, L. K.; Лысенко, С. Е.; Notkin, G.E.; Pavlov, Y.; Poznyak, V. I.; Razumova, K.A.; Roj, I.N.; Savrukhin, P. V.; Sannikov, V. V.; Sushkov, A. V.; Trukhin, V. M.; Vasin, N.L.; Vershkov, V.A.; Денисов, Г. Г.; Belousov, V. I.; Flyagin, V.A.; Forest, C.B.; Lohr, J.; Luce, T. C.; Harvey, R. W.; Grek, B.

doi:10.1088/0029-5515/35/4/i01

Cited by 24 publications

(19 citation statements)

References 11 publications

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“…In low beta plasmas, a strong decrease in ζ ec with increasing radius has been observed previously in co current drive discharges on DIII-D [35] and other devices as mentioned in Section 1 [11,14,27,28,29,33,34]. If the decrease in ζ ec with ρ is due to electron trapping, then the decrease should be less for high β e plasmas as well as for deposition locations near the inboard midplane.…”

Section: Radial Dependencementioning

confidence: 53%

“…On the T-10 tokamak, the experimental ECCD was in qualitative agreement with quasilinear Fokker-Planck calculations, but the interpretation was complicated by sawteeth, transport losses, and non-optimum launch polarization so quantitative agreement was not obtained [27,28,29]. The effect of the residual dc parallel electric field on ECCD predicted by Fokker-Planck calculations was confirmed in the COMPASS-D [30] and DIII-D [31,32] tokamaks.…”

Section: Introductionmentioning

confidence: 79%

“…This dc electric field effect also may have been responsible for the missing counter ECCD on the RTP tokamak [33,34]. In addition, many tokamak experiments have reported that the ECCD efficiency decreases as the power deposition location is moved away from the plasma center either by varying the magnetic field strength [27,28,29,33,34] or by changing the poloidal steering of the ECCD launcher [11,14,35]. On the W7-AS stellarator, the role of trapped electrons in reducing the ECCD efficiency was clearly demonstrated in several experiments that utilized W7-AS's flexibility to operate at different magnetic field configurations [25].…”

Section: Introductionmentioning

confidence: 99%

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Detailed measurements of the electron cyclotron current drive efficiency on DIII-D

et al. 2002

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Electron cyclotron current drive (ECCD) experiments on the DIII-D tokamak are solidifying the physics basis for localized, off-axis current drive, the goal being to validate a predictive model for ECCD. The ECCD profiles are determined from the magnetic field pitch angles measured by motional Stark effect (MSE) polarimetry. The measured ECCD switches from the co to the counter direction as the toroidal injection angle is varied with a profile width that is in accordance with ray tracing calculations. Tests of electron trapping in low beta plasmas show that the ECCD efficiency decreases rapidly as the deposition is moved off-axis and towards the outboard side of the plasma, but the detrimental effects of electron trapping on the current drive are greatly reduced in high beta plasmas. Overall, the measured ECCD is in good agreement with theoretical calculations using a quasilinear Fokker-Planck code over a wide range of injection angles and plasma parameters.

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Section: Radial Dependencementioning

confidence: 53%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Detailed measurements of the electron cyclotron current drive efficiency on DIII-D

et al. 2002

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“…To this end, it is necessary to inject microwave radiation at an angle differing from 90 • with respect to the direction of the toroidal magnetic field. The experiments on the study of the EC current generation were carried out in the T-10 tokamak using both the first and the second ECR harmonics [6,7]. The experimental layout is shown in Fig.…”

Section: Noninductive Current Generationmentioning

confidence: 99%

Using High-Power Gyrotrons in the T-10 Tokamak

Kislov

Лысенко

Notkin

2016

Radiophys Quantum El

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In this work, we briefly review the T-10 tokamak experiments on the interaction of microwaves with the plasma in the electron-cyclotron resonance frequency range. The basic results on the electron-cyclotron heating and the noninductive current generation in the plasma at both the first and second cyclotron harmonics are presented along with the typical values of the heating and current-generation efficiencies. The possibility of using the local contribution of the high-frequency power to control the sawtooth-oscillation instability and the amplitudes of the neoclassical tearing modes is demonstrated. Using the injection of the high-frequency waves for the working-gas preionization, allows one to optimize both the breakdown phase in the absence of a rotational electric field and the discharge-current increase stage.

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“…Experimentally, the efficiency of ECH driven current generation was determined [25]. Full stabilization of internal local plasma instability and an opportunity of a strong stabilizing influence on MHD behaviour developing on the periphery of the plasma were again shown and to a greater extent (figure 5).…”

mentioning

confidence: 95%

Tokamak foundation in USSR/Russia 1950–1990

Smirnov

2009

Nucl. Fusion

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In the USSR, nuclear fusion research began in 1950 with the work of I.E. Tamm, A.D. Sakharov and colleagues. They formulated the principles of magnetic confinement of high temperature plasmas, that would allow the development of a thermonuclear reactor. Following this, experimental research on plasma initiation and heating in toroidal systems began in 1951 at the Kurchatov Institute. From the very first devices with vessels made of glass, porcelain or metal with insulating inserts, work progressed to the operation of the first tokamak, T-1, in 1958. More machines followed and the first international collaboration in nuclear fusion, on the T-3 tokamak, established the tokamak as a promising option for magnetic confinement. Experiments continued and specialized machines were developed to test separately improvements to the tokamak concept needed for the production of energy. At the same time, research into plasma physics and tokamak theory was being undertaken which provides the basis for modern theoretical work. Since then, the tokamak concept has been refined by a world-wide effort and today we look forward to the successful operation of ITER.

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Second harmonic electron cyclotron current drive experiments on T-10

Cited by 24 publications

References 11 publications

Detailed measurements of the electron cyclotron current drive efficiency on DIII-D

Detailed measurements of the electron cyclotron current drive efficiency on DIII-D

Using High-Power Gyrotrons in the T-10 Tokamak

Tokamak foundation in USSR/Russia 1950–1990

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