Heavy Ion Beam Probing - The Diagnostics For Internal Measurements Of The Plasma Electric Potential And Turbulence In Toroidal Plasma Devices

Melnikov, A. V.

doi:10.22323/1.240.0170

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…To find analytical expressions for I 0 and I 2 , it is useful to note that δ = b 2 − 4c is always positive for an eigenfrequency calculated for the monotonic profile of the temperature. For δ > 0, equation (26) gives the following analytical formula:…”

Section: Analytical Solution For Ggammentioning

confidence: 99%

“…The global eigenmodes do not experience the continuum damping due to phase mixing (contrary to the local modes of the continuous spectrum) and are expected to be easily excited and observed under real conditions. Moreover, the independence of the frequency of a GAM on plasma radius found in some recent experiments in the tokamaks equipped with diagnostic tools making available electric potential measurements at different plasma radii-see, e.g., [25][26][27]-serves as a direct evidence of the global structure of GAMs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Global geodesic acoustic mode in a tokamak with positive magnetic shear and a monotonic temperature profile

Ilgisonis

Khalzov

Lakhin

et al. 2014

Plasma Phys. Control. Fusion

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The analytical solution for global geodesic acoustic modes (GGAMs) in a tokamak with a positive magnetic shear profile and a monotonic temperature profile is found in the framework of magnetohydrodynamic theory. The axisymmetric eigenvalue problem for perturbed pressure and electrostatic potential is formulated as a recurrent set of equations for poloidal Fourier harmonics. The integral condition for the existence of GGAMs is obtained. It is shown that the traditional paradigm of having a off-axis maximum of the local geodesic acoustic frequency is not necessary for the existence of GGAMs; a representative example is designed.

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Section: Analytical Solution For Ggammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Global geodesic acoustic mode in a tokamak with positive magnetic shear and a monotonic temperature profile

Ilgisonis

Khalzov

Lakhin

et al. 2014

Plasma Phys. Control. Fusion

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show abstract

“…A number of experiments were performed during JE2 and later during the period of CRPs. The results were presented in a number of the IAEA TM on Research Using Small Fusion Devices (RUSFD), IAEA-FEC conferences [62][63][64][65][66][67], EPS Conferences on Plasma Physics [9][10][11][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82], and other conferences like ICPP [83], and published in the main IAEA journal Nuclear Fusion [14,[84][85][86][87] and other refereed journals [88][89][90][91][92]. These results were recognized by the mainstream plasma researchers and included in the multi-machines review papers [93][94][95].…”

Section: Specific Outputs Of Jes and Their Role In The Mainstream Fus...mentioning

confidence: 99%

“…The capability of the HIBP diagnostic to study plasma potential and turbulence in toroidal plasmas, demonstrated during JE2, was widely recognized. The conceptual designs and projects of the HIBP application were performed for the CRP community like TCABR [111], and also for other machines like WEGA [112,113] and the larger machines like TCV [114] MAST [115] and W7-X [116,117]. On the WEGA stellarator, the HIBP was build and the initial results were obtained [113] before the shut-down of the WEGA project.…”

Section: Specific Outputs Of Jes and Their Role In The Mainstream Fus...mentioning

confidence: 99%

Contribution of joint experiments on small tokamaks in the framework of IAEA coordinated research projects to mainstream fusion research

Gryaznevich

Ştöckel

Oost

et al. 2020

Plasma Sci. Technol.

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Joint experiments (JEs) on small tokamaks have been regularly performed between 2005 and 2015 under the framework of the International Atomic Energy Agency (IAEA) coordinated research projects (CRPs). This paper describes the background and the rationale for these experiments, how they were organized and executed, main areas of research covered during these experiments, main results, contributions to mainstream fusion research, and discusses lessons learned and outcomes from these activities. We underline several of the most important scientific outputs and also specific outputs in the education of young scientists and scientists from developing countries and their importance.

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“…A new set of Heavy ion beam probe diagnostic HIBP-2 was recently installed in TJ-II [75] ¼ of the torus apart from the routinely operated HIBP-1. Both HIBPs are operating in the similar cross-section of TJ-II vacuum chamber (see figure 3).…”

Section: Dual Hibpmentioning

confidence: 99%

Heavy ion beam probing—diagnostics to study potential and turbulence in toroidal plasmas

et al. 2017

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Heavy ion beam probing (HIBP) is a unique diagnostics to study the core plasma potential and turbulence. Advanced HIBPs operate in the T-10 tokamak and TJ-II flexible heliac with fine focused (<1 cm) and intense (100 µA) beams. They provide measurements in the wide density interval n e = (0.3-5) × 10 19 m −3 , in a wide range of Ohmic and electron cyclotron resonance heated (ECRH) discharges with various currents at T-10, and in the wide range of magnetic configurations with ECR and neutral beam injection (NBI) heating at TJ-II. Time evolution of the radial profiles and/or local values of plasma parameters from high field side (HFS) to low field side (LFS), −1 < ρ < 1, is observed in TJ-II by 125 keV Cs + ions in a single shot, while LFS (+0.2 < ρ < 1) is observed in T-10 by 300 keV Tl + ions. Multi-slit energy analyzers provide simultaneously data on the plasma potential ϕ (by the beam extra energy), plasma density n e (by the beam current), poloidal magnetic field B pol (by the beam toroidal shift), poloidal electric filed E pol that allows one to derive the electrostatic turbulent particle flux Γ E×B . The cross-phase of density oscillations produces the phase velocity of their poloidal propagation or rotation; also it gives the poloidal mode number. Dual HIBP, consisting of two identical HIBPs located ¼ torus apart provide the long-range correlations of core plasma parameters. Low-noise high-gain electronics allows us to study broadband turbulence and quasi-coherent modes like geodesic acoustic modes and Alfvén eigenmodes.

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Heavy Ion Beam Probing - The Diagnostics For Internal Measurements Of The Plasma Electric Potential And Turbulence In Toroidal Plasma Devices

Cited by 3 publications

References 11 publications

Global geodesic acoustic mode in a tokamak with positive magnetic shear and a monotonic temperature profile

Global geodesic acoustic mode in a tokamak with positive magnetic shear and a monotonic temperature profile

Contribution of joint experiments on small tokamaks in the framework of IAEA coordinated research projects to mainstream fusion research

Heavy ion beam probing—diagnostics to study potential and turbulence in toroidal plasmas

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