Simulations of the radial electric field induced by neutral beam injection in a tokamak

Xu, Xingyuan; Xu, Yongjian; Zhang, Xiaodong; Hu, Youjun

doi:10.1088/1741-4326/ac054d

Cited by 7 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To investigate the impact of such increased toroidal rotation on turbulence, modeling by including different factors (impurity or toroidal rotation) is performed. In the modeling, the radial electric field induced by NBI [46] and the increased toroidal rotation being 10 kV m −1 and 15 km s −1 , separately. Gradients of toroidal rotation are not included.…”

Section: Effect Of Toroidal Rotation On Turbulencementioning

confidence: 99%

Mechanism of enhanced ion temperature by impurity seeding in EAST H-mode plasma

Yang,

Gong,

Qian

et al. 2023

Nucl. Fusion

View full text Add to dashboard Cite

Ion temperature (Ti) profiles are commonly observed to increase in peaking, leading to higher central Ti, after impurity seeding in EAST H-mode plasma. Argon can be more efficient to raise Ti than neon. Toroidal rotation can also be enhanced in scenarios with NBI heating. More significant increased toroidal rotation is brought by seeding argon than seeding neon. Turbulence is experimentally observed to be suppressed. Extensive modelling by quasilinear gyrokinetic code QuaLiKiz is performed to explain above observations. It is found that the enhanced Ti can be always explained by the turbulence stabilization. But the mechanism of turbulence stabilization is related to heating methods and the seeding impurity species. In the pure RF (ECRH+LHW) heating scenarios, where only TEM exists, argon can stabilize TEM more significantly than neon due to its higher charge and heavier mass. In the scenarios with increasing NBI power, ion heat flux can be dominated by ITG, thus the enhanced Ti is mainly attributed to ITG stabilization. In these cases, except argon’s ability to more efficiently stabilize TEM, more evident increased toroidal rotation brought by argon seeding can be also beneficial to stabilize turbulences.

show abstract

Section: Effect Of Toroidal Rotation On Turbulencementioning

confidence: 99%

Mechanism of enhanced ion temperature by impurity seeding in EAST H-mode plasma

Yang,

Gong,

Qian

et al. 2023

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…The fast particle behaviour is independent of the initial time in our simulations, therefore, it is not necessary to launch new test particles to replace the thermal particles (Xu et al. 2020, 2021). In this simulation time, NBI fast ion losses can reach a steady state when the Coulomb collision is present.…”

Section: Simulation Set-upmentioning

confidence: 99%

Guiding-centre orbit-following simulations of charge exchange loss of NBI ions with the finite Larmor radius effect

Xu,

Wang,

et al. 2023

J. Plasma Phys.

Self Cite

View full text Add to dashboard Cite

Guiding-centre orbit-following simulations of the charge exchange (CX) loss of neutral beam injection (NBI) ions are presented. The finite Larmor radius (FLR) effect in the fast ion–neutral collision can be included in guiding-centre orbit-following simulations by using the gyroaverage method. It is proved that the neutralization probability of fast ions computed by using the gyroaverage method in the guiding-centre orbit simulation is roughly the same as that computed in the full-orbit simulation when the time step in the guiding-centre simulation is the order of the gyroperiod. The CX losses of NBI fast ions for two NBIs in the EAST tokamak have been simulated by the guiding-centre orbit-following code GYCAVA, and the FLR effect in the fast ion–neutral collision on CX losses has been numerically studied. The CX effect of the fast ion–neutral collision can significantly enhance NBI ion losses on EAST. The FLR effect in the fast ion–neutral collision can enhance the CX loss. Vertical asymmetry of localized heat loads induced by CX losses is found, which is related to the FLR effect of fast ions and the strong radial gradient of the neutral density near the plasma edge. Heat loads induced by CX losses are localized in the regions near the poloidal angle $\theta =-60^\circ$ , because the likelihood of exchanging charge is the largest at gyrophase $\xi ={\rm \pi}$ , and this leads to fast downwards moving neutrals. Fast ion loss fractions induced by CX increase with the neutral density increasing.

show abstract

“…The simulation results show that NBI ions can produce a significant radial electric field in the core region. The dependence of the radial electric field on the injection direction and the beam energy has been investigated [30].…”

Section: Energetic Particle Physicsmentioning

confidence: 99%

Summary of the 10th Conference on Magnetically Confined Fusion Theory and Simulation (CMCFTS)

Wang

Qiu

Wang

et al. 2023

Plasma Sci. Technol.

View full text Add to dashboard Cite

This paper gives a summary of the organization and the presentations delivered at the 10th Conference on Magnetically Confined Fusion Theory and Simulation (CMCFTS) held in Zhuhai, China, from 28th to 31st October 2022. The conference focused on the latest progress in the research of the magnetic confined fusion plasma theory and simulations, as well as the large-scale numerical simulation techniques developed in recent years. This conference is held both online and offline, with about 110 domestic participants from 18 institutes participating in the live conference, and the statistical data from the live broadcast platform indicated that the online conference attracted over 20000 views per day. A summary of the conference is given, and the history of the CMCFTS is presented. A brief introduction to the poster section is also included in this paper.

show abstract

Simulations of the radial electric field induced by neutral beam injection in a tokamak

Cited by 7 publications

References 37 publications

Mechanism of enhanced ion temperature by impurity seeding in EAST H-mode plasma

Mechanism of enhanced ion temperature by impurity seeding in EAST H-mode plasma

Guiding-centre orbit-following simulations of charge exchange loss of NBI ions with the finite Larmor radius effect

Summary of the 10th Conference on Magnetically Confined Fusion Theory and Simulation (CMCFTS)

Contact Info

Product

Resources

About