Simulation of electron cyclotron current drive and electron cyclotron resonant heating for the HL-2A tokamak

Wang, Zhongtian; Yong-Xing, Long; Dong, J. Q.; He, Z. Y.

doi:10.1088/1674-1056/22/9/095201

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…[18][19][20][21] Its main characteristics are easy to read, efficient, and highly modulized. So far, TORAY has been commonly benchmarked with other linear, quasi-linear, [22,23] Gaussian beam codes, and quasioptical codes. Here, thirty rays with a Gaussian distribution in the TORAY code were chosen to launch under different conditions, and the Lin-Liu model [24] was chosen to calculate the current drive efficiency.…”

Section: Toray Code and The Parameters Of Hl-2mmentioning

confidence: 99%

Numerical analysis of the optimized performance of the electron cyclotron wave system in a HL-2M tokamak

Gong

Dong

et al. 2016

Chinese Phys. B

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The capabilities of current drive, neoclassical tearing mode (NTM) stabilization, and sawtooth control are analyzed for the electron-cyclotron wave (ECW) system in a HL-2M tokamak. Better performance of the upper launcher is demonstrated in comparison with that of a dropped upper launcher, in terms of J EC /J bs for NTM stabilization and I ECCD /(∆ρ tor ) 2 for sawtooth control. 1-MW ECW power is enough for the 3/2 NTM stabilization, and 1.8-MW ECW power is required to suppress 2/1 NTM in a single null divertor equilibrium with 1.2-MA toroidal current with the upper launcher. Optimization simulation of electron-cyclotron current drive (ECCD) is carried out for three mirrors in an equatorial port, indicating that the middle mirror has a good performance compared with the top and bottom mirrors. The results for balanced co-and counter-ECCD in an equatorial port are also presented.

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Section: Toray Code and The Parameters Of Hl-2mmentioning

confidence: 99%

Numerical analysis of the optimized performance of the electron cyclotron wave system in a HL-2M tokamak

Gong

Dong

et al. 2016

Chinese Phys. B

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“…By taking a weak convection, i.e., 𝜕𝑎 1 /𝜕𝑥 = 𝛿𝑎 1 , where 𝛿 is a damping rate, and we can obtain 𝑎 1 (𝑥) from Eq. (18). Substituting 𝑎 1 (𝑥) into Eq.…”

mentioning

confidence: 99%

Absolute and Convective Instabilities of Two-Plasmon Decay in an Inhomogeneous Magnetized Plasma

Sun

Jiang

et al. 2015

Chinese Phys. Lett.

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Three-wave resonant parametric decay instability of extraordinary wave decay into two upper hybrid waves in an inhomogeneous plasma is studied theoretically. Analytical expressions of the local absolute growth rate, convective amplification factor and threshold intensity are obtained. The calculated results show that the effects of magnetic field and 𝑘𝑦 (𝑘𝑦 is the component of the wavenumber of upper hybrid wave perpendicular to pump wave 𝑘0) on the growth rate, amplification factor and threshold intensity are extremely dependent on their strength. The absolute growth rate and convective amplification factor increase with the plasma density while the threshold decreases. Moreover, the expression indicates that the inhomogeneity scale length of density and linear damping will reduce the convective amplification factor.

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Synergistic current drive of helicon wave and lower hybrid wave in HL-2M

Liu,

LI,

Liu

et al. 2023

Acta Phys. Sin.

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Non-inductive current drive plays a crucial role in tokamak, especially for its steady state operations. Recently, the helicon wave (HW) has been regarded as a promising tool for driving off-axis plasma current in reactor-grade machine. The lower-hybrid wave (LHW) is the most effective radio-frequency current drive method, however, it has the drawback, which is limited by the conditions of wave accessibility in the high parameter tokamak, making the wave power usually damped at the plasma edge. HW can spiral towards the plasma centre directly under a high electron density. To obtain a long pulse steady state operation of reactor tokamak, the complementarity of HW and LHW in the aspect of driven current distribution in the high parameter tokamak is considered. The synergy current drive of the HW and the LHW is studied numerically in the steady-state scenario of HL-2M. According to the fast wave dispersion relation of plasma, the HW parameters, including its wave frequency and launched parallel refractive index, are obtained firstly. Results of GENRAY code simulation show that a single pass wave power absorption of the HW can be obtained generally through the electron Landau damping and transit time magnetic pumping effects. On the other hand, the LHW parameters are adopted from the equipped system on the machine. Results of single pass wave absorption are also obtained in the case of LHW. And then, the synergy effects of HW and LHW are studied numerically based on the GENRAY/CQL3D models. The cooperation of these two waves results in a broad plasma current distribution along the radial direction (<inline-formula><tex-math id="M2">\begin{document}$\rho = $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20231077_M2.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="24-20231077_M2.png"/></alternatives></inline-formula>0.2－0.9) in the machine. Taking the electron distribution functions of these waves into account, it is clear that the electrons are accelerated by the HW in the parallel magnetic field direction, resulting in more electrons entering the region of LHW resonance area. As the consequence, a net plasma current appears. Furthermore, a fine-grained parametric scan is performed by changing the launched parallel refractive index of HW, and the results indicate that positive synergy effects can be generally observed once the related wave current drive profiles are overlapped. Finally, the synergy factor is shown to be proportional to this overlap and reaches its maximum value of 1.18 in HL-2M.

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Simulation of electron cyclotron current drive and electron cyclotron resonant heating for the HL-2A tokamak

Cited by 3 publications

References 9 publications

Numerical analysis of the optimized performance of the electron cyclotron wave system in a HL-2M tokamak

Numerical analysis of the optimized performance of the electron cyclotron wave system in a HL-2M tokamak

Absolute and Convective Instabilities of Two-Plasmon Decay in an Inhomogeneous Magnetized Plasma

Synergistic current drive of helicon wave and lower hybrid wave in HL-2M

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