Impact of E × B drift on tungsten impurity transport and analysis of its instantaneous response: a particle Monte Carlo simulation

Yunong Wu; Chaofeng Sang; Yilin Wang; Chen Zhang; Qingrui Zhou; Yongjun He; Dezhen Wang

doi:10.1088/1741-4326/ae1c4f

November 6, 2025Nuclear FusionOpen Access

Impact of E × B drift on tungsten impurity transport and analysis of its instantaneous response: a particle Monte Carlo simulation

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Key Points

To investigate how E × B drift and its instantaneous response govern tungsten impurity transport, redeposition, and core contamination in tokamak fusion devices.
Upgraded the particle Monte Carlo impurity transport code IMPEDGE to incorporate E × B drift dynamics.
Simulated tungsten impurity behavior in a single-null magnetic configuration on the EAST tokamak across varying drift directions and neon seeding rates.
Formulated a simplified theoretical model comparing poloidal drift deposition distance against ionization mean free path to analyze drift-induced redeposition.
Demonstrated that E × B drift exhibits an instantaneous response faster than collisional relaxation, fundamentally shifting tungsten stagnation points and divertor target dynamics.
Observed that increasing neon injection under forward toroidal magnetic fields expands the reversed drift zone, directly increasing core tungsten impurity concentration.
Determined that impurities return to the divertor target when the poloidal drift deposition distance exceeds the ionization mean free path, an effect amplified by high electron temperature and drift velocity.

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Implication

Particle Monte Carlo simulation reveals how E × B drift governs tungsten impurity transport in EAST tokamak plasmas, indicating that instantaneous drift response dictates core accumulation.

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Cite This Study

Wu et al. (2025) studied this question.

synapsesocial.com/papers/6a99385e4129c1a0f674aa04 https://doi.org/10.1088/1741-4326/ae1c4f

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Impact of E × B drift on tungsten impurity transport and analysis of its instantaneous response: a particle Monte Carlo simulation

Key Points

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Cite This Study

Impact of E × B drift on tungsten impurity transport and analysis of its instantaneous response: a particle Monte Carlo simulation

Key Points

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Implication

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Cite This Study

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