Influences of plasma density perturbations on ion cyclotron resonance heating

Zhang, Jiahui; Zhang, W.; Zhang, Xinjun; Qin, Chengming; Yang, Yuqing; Shi, Lei

doi:10.1088/1741-4326/acb607

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…Although the heating effect of the fundamental frequency in hydrogen plasma is poor due to the zero wave polarization [12,17] at the resonance layer, the heating effect of H ions at the fundamental frequency has been obtained using the BON code. Figure 6 presents the SPA heating effect near the magnetic axis for H fundamental frequency on-axis heating, calculated using the BON code with .…”

Section: On-axis Heating Scheme For the Fundamental Frequencymentioning

confidence: 99%

“…Auxiliary heating power is crucial, especially for spherical tokamaks, which have limited internal space and which results in a small volt-seconds value for the central solenoid [7]. Ion cyclotron range of frequency (ICRF) heating is the only auxiliary heating method that directly heats ions [8][9][10][11][12][13], making it a critical component in achieving high ion temperatures. Single-pass absorption (SPA) analysis provides a convenient method to quickly understand heating effects, and provides the total absorption proportions, which are not available with a full-wave code [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of ion cyclotron wave heating in the EXL-50U spherical tokamak based on dispersion relations

MA 马,

XIE 谢,

LI 李

2024

Plasma Sci. Technol.

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This study investigates the single-pass absorption (SPA) of ion cyclotron range of frequency (ICRF) heating in hydrogen plasma of the EXL-50U spherical tokamak, which is an upgraded device of the EXL-50 with a central solenoid and a stronger magnetic field. The reliability of the kinetic dispersion equation is confirmed by the one-dimensional full-wave code, and the applicability of Porkolab’s simplified theoretical SPA model is discussed based on the kinetic dispersion equation. Simulations are conducted to investigate the heating effects of the fundamental and second harmonic frequencies. The results indicate that with the design parameters of the EXL-50U device, the SPA for second harmonic heating is 63%, while the SPA for fundamental heating is 13%. Additionally, the optimal injection frequencies are 23 MHz at 0.9 T and 31 MHz at 1.2 T. The wave vector of the antenna parallel to the magnetic field, with a value of k∥ = 7.5 m−1, falls within the optimal heating region. Simulations reveal that the ICRF heating system can play an important role in the ion heating of the EXL-50U.

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Section: On-axis Heating Scheme For the Fundamental Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of ion cyclotron wave heating in the EXL-50U spherical tokamak based on dispersion relations

MA 马,

XIE 谢,

LI 李

2024

Plasma Sci. Technol.

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“…Vallejos used the FEMIC to study how phase affects ion cyclotron heating in the ITER device [27], while Zhang further verified its effectiveness by simulating ion cyclotron heating in the EAST device [28,29]. To ensure the reliability of the simulation results in this paper, benchmarking is carried out between the FEMIC code integrated with the Fokker-Planck code (referred to herein as FEMIC-FP) and the TORIC-SSFPQL code for ICRH in ITER.…”

Section: Benchmarkmentioning

confidence: 99%

“…Instead, the effects of poloidal phasing on ICRH power absorption and coupling for ITER are studied using a novel code (FEMIC) based on the finite-element method that includes both core and edge models [27]. We applied the finiteelement method based on the approach of [27] to simulate ICRH on EAST [28,29].…”

Section: Introductionmentioning

confidence: 99%

A full wave solver integrated with a Fokker–Planck code for optimizing ion heating with ICRF waves for the ITER deuterium–tritium plasma

Yin,

Peng,

Zhang

et al. 2024

Nucl. Fusion

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Efficient ion heating is crucial for future fusion devices, and the only way to heat ions directly is ion cyclotron resonance heating (ICRH). Reported here is a full wave solver integrated with a Fokker–Planck code for optimizing ion heating with ion cyclotron range of frequency waves for the International Thermonuclear Experimental Reactor (ITER)deuterium-tritium plasma. Both the direct absorption of minority ions and the power transfer to bulk ions via collisions are considered, while also accounting for the edge effects on ion absorption near the core. The simulation results show that the appropriate scrape-off layer density profile and parallel wave number lead to enhanced edge coupling and broaden the absorption region with moderate absorption intensity of the minority ions, which is very important for ion heating. More power from the heated ions is transferred to bulk ions than to electrons through collisions in our simulation via optimization, and reducing the total RF power results in a significant increase of the absorbed fraction of bulk ions.

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“…The 2D full-wave simulation model for EAST is shown in figure 14. Previously, this model has been applied to study the influence of plasma density perturbations on ICRH [28]. The complex structures of the first wall and antenna straps are retained.…”

Section: Influence Of the Poloidal Antenna Phasing Differencementioning

confidence: 99%

An alternative method to mimic mode conversion for ion cyclotron resonance heating

Zhang,

Qin

et al. 2023

Nucl. Fusion

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Ion cyclotron range of frequency waves in hot plasmas exhibit spatial dispersion effects and the wave equation takes the integro-differential form. Under the local plasma model assumption, the wave equation can be simplified to the differential form and adapts to the numerical scheme of the finite element method (FEM). Even though direct absorption of fast waves by ions and electrons can be described well by the local plasma model, linear mode conversion associated with non-local effects is absent. To deal with this issue, an alternative method is put forward in this paper where quasi-electrostatic fluid waves based on the multi-fluid warm plasma model are employed to take the place of ion Bernstein waves in mode conversion. On this basis, an interative fluid-kinetics (INTFLUK) code based on the FEM is developed for full-wave simulation in hot plasmas. Derivation of the wave equations as well as benchmarking of the INTFLUK code against other wave simulation codes are carried out. In both one- and two-dimensional cases, the validity of the INTFLUK code was verified by comparison of the wave field distributions and power deposition. As a useful illustration of the INTFLUK code including the scrape-off layer and a realistic antenna, the influence of the poloidal antenna phasing difference on ion cyclotron resonance heating is analyzed. Finally, it should be noted that the method in this paper has the potential to be extended to the three-dimensional case, which will be considered in the near future.

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Influences of plasma density perturbations on ion cyclotron resonance heating

Cited by 5 publications

References 25 publications

Simulation of ion cyclotron wave heating in the EXL-50U spherical tokamak based on dispersion relations

Simulation of ion cyclotron wave heating in the EXL-50U spherical tokamak based on dispersion relations

A full wave solver integrated with a Fokker–Planck code for optimizing ion heating with ICRF waves for the ITER deuterium–tritium plasma

An alternative method to mimic mode conversion for ion cyclotron resonance heating

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