Backscattering of gyrotron radiation and short-wavelength turbulence during electron cyclotron resonance plasma heating in the L-2M stellarator

Batanov, G. M.; Borzosekov, V. D.; Коврижных, Л. М.; Колик, Л. В.; Konchekov, E. M.; Malakhov, D. V.; Petrov, A. E.; Sarksyan, K. A.; Скворцова, Н. Н.; Степахин, В. Д.; Kharchev, N. K.

doi:10.1134/s1063780x13060019

Cited by 34 publications

(21 citation statements)

References 11 publications

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“…the non-linear Bragg backscattering (Gusakov et al 2009) or the wave trapping Gusakov et al 2011). The possibility to have non-linear effects is an experimental evidence in the Stellerators through the measurements of Bragg backscattering (Batanov et al 2013).…”

Section: Beam Broadening Simulation From Numerical Scheme To Resultsmentioning

confidence: 99%

“…The possibility to have nonlinear effects is experimental evidence in the stellarators through measurements of Bragg backscattering (Batanov et al. 2013).…”

Section: Role Of Density Fluctuations On Wave Heatingmentioning

confidence: 99%

“…in backscattering (Batanov et al. 2013). That is to say, for the turbulence code to be relevant, it should include such possibilities, by choosing a spatial grid able to precisely describe these phenomena, which could be incompatible with the numerical constraints.…”

Section: Conclusion and New Developmentsmentioning

confidence: 99%

“…For instance, spatial steps that are too wide are used in turbulence codes to describe properly the small spatial scales involved in the scattering processes really present in an experiment, e.g. in back scattering (Batanov et al 2013). That is to say, for the turbulence code to be relevant, it should include such possibilities, by choosing a spatial grid able to precisely describe these phenomena, which could be incompatible with the numerical constraints.…”

Section: Conclusion and New Developmentsmentioning

confidence: 99%

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Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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(Received ?; revised ?; accepted ?. -To be entered by editorial office)Firstly, a brief overview will be given on different models that are able to describe the behaviour of wave propagation as a function of specific frequency ranges. Each range corresponds to different heating systems, namely, 20-100 MHz for the Ion Cyclotron Resonant Heating (ICRH), 2-20 GHz for Lower Hybrid Heating or Current Drive (LHCD), and 100-250 GHz for Electron Cyclotron Resonant Heating (ERCH) or Current Drive (ECCD) systems. Every systems' specifications will be explained in detail, including the typical set of equations and the assumptions needed to describe the properties of these heating or current drive systems, as well as their specific domains of validity. In these descriptions, special attention will be paid to the boundary conditions. A review about specific physical problems associated with the wave heating systems will also be provided. Such review will detail the role of simulation in answering questions coming from experiments on magnetized plasma devices devoted to Fusion. A few examples which will be covered are the impact of edge turbulence on wave propagation and its consequences on the heating system performances, effects of the fast particles, ponderomotive effects, among others. A study that is more focused on Radio Frequency (RF) sheath effects will also be discussed. It shows that such simulations require very sophisticated tools to gain a partial understanding of the observations undertaken in dedicated experiments. To conclude this review, an overview will be given about the requirements and progress necessary to obtain relevant predictive simulation tools able to describe the wave heating systems used in fusion devices.

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Section: Beam Broadening Simulation From Numerical Scheme To Resultsmentioning

confidence: 99%

“…The possibility to have nonlinear effects is experimental evidence in the stellarators through measurements of Bragg backscattering (Batanov et al. 2013).…”

Section: Role Of Density Fluctuations On Wave Heatingmentioning

confidence: 99%

Section: Conclusion and New Developmentsmentioning

confidence: 99%

Section: Conclusion and New Developmentsmentioning

confidence: 99%

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Simulation as a tool to improve wave heating in fusion plasmas

et al. 2015

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“…In our experiments on ECR heating of plasma in the L-2M stellarator (see, e.g., [3]), we have revealed microwave reflection from the region of the resonance at the second harmonic of the electron gyrofrequency (ω 0 ≈ 2ω ce , where ω 0 is the angular frequency of heating radiation and ω ce is the electron gyrofrequency) by analyzing backscattered gyrotron radiation [4,5].…”

Section: Introductionmentioning

confidence: 99%

Microwave Reflection from the Region of Electron Cyclotron Resonance Heating in the L-2M Stellarator

Batanov

Borzosekov

Kharchev

et al. 2014

Plasma and Fusion Research

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In experiments on electron cyclotron resonance (ECR) heating of plasma at the second harmonic of the electron gyrofrequency in the L-2M stellarator, the effect of partial reflection of high-power gyrotron radiation from the ECR heating region located in the center of the plasma column have been revealed. The reflection coefficient is found to be on the order of 10 −3 . The coefficient of reflection of an extraordinary wave from the second-harmonic ECR region is calculated in the one-dimensional full-wave model. The calculated and measured values of the reflection coefficient are found to coincide in the order of magnitude.

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Parametric decay instability of an obliquely propagating ordinary wave in the electron cyclotron frequency range

Gusakov

Popov

2017

Physics of Plasmas

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The possibility of the low-power-threshold parametric decay of an obliquely propagating ordinary wave to an upper hybrid wave and a low-hybrid wave is analysed under conditions of nonmonotonic plasma density profile in a magnetic trap. The instability threshold and growth rate are derived explicitly. The analytical results are illustrated under the conditions typical of the ordinary mode fundamental electron cyclotron resonance heating harmonic experiments at the FTU tokamak.

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Backscattering of gyrotron radiation and short-wavelength turbulence during electron cyclotron resonance plasma heating in the L-2M stellarator

Cited by 34 publications

References 11 publications

Simulation as a tool to improve wave heating in fusion plasmas

Simulation as a tool to improve wave heating in fusion plasmas

Microwave Reflection from the Region of Electron Cyclotron Resonance Heating in the L-2M Stellarator

Parametric decay instability of an obliquely propagating ordinary wave in the electron cyclotron frequency range

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