Numerical investigation of a minority heating scenario in three-ion components plasma on EAST

Yin, Liang; Yang, Cheng; Zhang, Xinjun; Zheng, Pingwei; Liu, J.; Li, Guoqiang; Wang, Yifeng; Li, Yingying; Lyu, Bo; Zang, Qing; Zheng, Zhen; Men, Zongzheng; Song, Chengyi; Huang, Qianhong; Chen, You; Gong, Xiao

doi:10.1063/5.0015226

Cited by 4 publications

(4 citation statements)

References 45 publications

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“…In our calculations, the initial location of fast ions is chosen to be located near the magnetic axis, but symmetrical in toroidal direction, as shown in figure 1(b). This is consistent with the results of figure 4 in [19], where it is shown that the resonance layer of the H ions is located near the magnetic axis. In the resonance layer, the fast ions are uniformly loaded in the configuration space.…”

Section: Simulation Parameterssupporting

confidence: 93%

“…Here a simplification of the same effective perpendicular temperature in the whole resonance layer is adopted. The maximum ion temperature of fast ions traced in our calculation is set as 119 keV, which is chosen according to [19]. The prompt loss time is about 200 ms for the parameters used in our simulations.…”

Section: Simulation Parametersmentioning

confidence: 99%

“…For the second characteristic, Dendy proposed a distribution function form for the ICRH fast ions in [15] in 1995 on the basis of Stix's model [14] and Mori's numerical modeling [16], and in recent years, a bi-Maxwellian distribution function form has also been used for ICRH fast ions [17,18]. Based on these characteristics, the loss of fast ions produced by minority ICRH is studied by a guiding center orbit following code, which is written to use the location of the resonance layer calculated by the full-wave code TORIC in [19] and the bi-Maxwellian distribution function form in [17] as inputs. The prompt loss and loss distribution of fast ions reported here could be a useful reference point for future experimental and theoretical investigations of ICRH fast ion physics in EAST.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on the loss of fast ions produced by minority ion cyclotron resonance heating in EAST

Zhang

Xiang

2021

Plasma Sci. Technol.

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The classical prompt loss of fast ions produced by minority ion cyclotron resonance heating (ICRH) is studied by a guiding center orbit following code in the Experimental Advanced Superconducting Tokamak (EAST). It is found that the loss of fast ions produced by ICRH mainly appears in both ends of the resonance layer, while the loss of fast ions in the middle resonance layer is very small. The dominant fast loss comes from trapped ions, rather than from passing ions. Controlling the location of resonance layer at the plasma core may be more beneficial to the EAST tokamak ICRH. In addition, the loss distribution of fast ions is studied. The results show that the fast ions are mainly lost near the midplane in the poloidal direction, but almost uniformly in the toroidal direction. Moreover, we investigate the dependence of fast ion loss on the ICRH power. The simulation results show that the loss fraction of fast ions in both ends of the resonance region increases with the ion cyclotron range of frequencies (ICRF) power, but barely affects the loss of fast ions in the middle region.

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Section: Simulation Parameterssupporting

confidence: 93%

Section: Simulation Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study on the loss of fast ions produced by minority ion cyclotron resonance heating in EAST

Zhang

Xiang

2021

Plasma Sci. Technol.

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“…To reach the ignition temperature, the auxiliary heating, such as high-energy NBI heating or resonant heating using RF waves, must supplement the intrinsic ohmic heating [1]. Ioncyclotron resonant heating (ICRH) has a variety of heating schemes [1][2][3], and it has the advantage of localized deposition of energy and the ability to heat the core plasma [4,5]. Different from the RF wave heating, NBI heating is independent on any resonance or coupling conditions [6], and its heating physical mechanism is clear and has a high plasma heating efficiency, and it can preferentially heat the electrons or ions in the background plasma as needed [7].…”

Section: Introductionmentioning

confidence: 99%

3D simulation of orbit loss and heat load on limiters of ICRF-NBI synergy induced fast ions on EAST

Zheng

Zhang

et al. 2023

Nucl. Fusion

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Fast ions synergy induced by ion-cyclotron range of frequency (ICRF) and neutral beam injection (NBI) are of interest not only because of their advantage of heating the plasma and drive currents, but also because of their disadvantage of damaging plasma surface components and driving MHD instabilities. In this paper, we calculate the fast ion loss and the deposition distribution of the lost particles on the limiters in EAST under the synergistic effect of the ripple field and collisions with the full-orbit-following simulation program ISSDE for the first time. The previous models to study the NBI fast ion loss by the action of ICRF are relatively simple and consider fewer influencing factors. Most studies on fast ion loss have used toroidal uniform boundaries. In this work, we consider the distribution of ICRF-NBI synergy induced fast ions with different minority H concentrations. After setting the limiter boundary, we consider the prompt fast ion loss caused by the equilibrium field and the fast ion loss caused by the ripple field and collision. Under the action of minority-ion ICRH, the NBI fast ion distribution function has spread in the high-energy part, especially for the minority H concentration of 1\%, and the fast ions show each anisotropic distribution near the resonance band on the poloidal dimension. The synergistic loss caused by the ripple field and collision will first be greater than the loss caused by either factor, and then reach a final loss fraction of 3.8\%. The heat load power density of the lost fast ions on different limiters is not uniform, as well as on each limiter, which is related to the distance from the limiter to the plasma, the relative position between the limiters and the parallel direction of most fast ions. Once the study of ICRF-NBI synergy induced fast ion loss caused by the action of ripple and collision has been done, we can do optimization in a targeted manner. Such as adding ferromagnetic inserts to reduce the ripple loss and optimizing the limiters’ position to reduce or control the generation of impurities.

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Numerical study of minority ion heating scenarios in a spherical tokamak plasma

Chen,

Yin,

Peng

et al. 2024

Physics of Plasmas

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In this study, D(H) minority ion cyclotron resonance heating (ICRH) scenarios in Nan Chang spherical tokamak (NCST) were simulated using the full-wave code TORIC. NCST is a low-aspect-ratio (R/a = 1.67) spherical tokamak, with its core plasma parameters characterized by a magnetic field intensity of 0.36 T and a density of 1018 m−3. Our simulation results demonstrate that the ion cyclotron wave can penetrate the core plasma of the NCST more effectively with a lower toroidal mode number, indicating that resonant ions can absorb the wave energy efficiently. Furthermore, it is found that as the minority ion H concentration is increased, a noticeable decline in the left-handed electric field adjacent to the ion cyclotron resonance layer is observed. Optimal heating efficiency is attained when maintaining a minority ion H concentration within the range 5%–10%. The minority ion velocity distribution was simulated to estimate the tail temperature of minority-ICRH, which is expected to exceed 10 keV. The difference in the power efficiency with different plasma compositions [Ar(H) and D(H)] was also simulated. When the H-ion cyclotron resonance layer is located at the core plasma, the power-absorption fraction of H in Ar(H) plasma surpasses that of D and H combined in D(H) plasma under identical conditions. These simulations provide a crucial foundation and theoretical reference not only for NCST but also for other spherical tokamaks conducting ICRH experiments.

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Numerical investigation of a minority heating scenario in three-ion components plasma on EAST

Cited by 4 publications

References 45 publications

Numerical study on the loss of fast ions produced by minority ion cyclotron resonance heating in EAST

Numerical study on the loss of fast ions produced by minority ion cyclotron resonance heating in EAST

3D simulation of orbit loss and heat load on limiters of ICRF-NBI synergy induced fast ions on EAST

Numerical study of minority ion heating scenarios in a spherical tokamak plasma

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