Collisionless pitch-angle scattering of runaway electrons

Liu, Jian; Wang, Yulei; Qin, Hong

doi:10.1088/0029-5515/56/6/064002

Cited by 22 publications

(54 citation statements)

References 51 publications

(98 reference statements)

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“…For example, at t = 3. agrees with the numerical results in Ref. [26] and offers a direct description of the origin of collisionless pitch-angle scattering.…”

Section: Runaway Dynamics In T C -Timescalesupporting

confidence: 90%

“…Because it has been proved that the gyro-center model breaks down for the dynamics of energetic runaway electrons [26], the motion of runaways in Besides the outward neoclassical drift orbit similar to the results from the gyrocenter code [25,30], it can also be observed that there exist ripple structures superimposed on each circle orbit. These fine ripple structures, which cannot be recovered by gyro-center models, correspond to the runaway motion in T c -timescale and become more obvious as time going.…”

Section: Runaway Dynamics In T C -Timescalementioning

confidence: 66%

“…The synchrotron radiation is included as the dominate channel of runaway energy dissipation. The collisional resistance is neglected because its effect is small enough compared with the collisionless pitch-angle scattering [26]. Consequently, we describe the runaway electrons by use of the following equations,…”

Section: Physical Model and Numerical Methodsmentioning

confidence: 99%

“…Especially, a recent full-orbit simulation on runaway electrons has shown that the assumption of gyro-center theory no longer holds in tokamak magnetic field if the runaway electrons are accelerated to several tens of MeVs [26].…”

Section: Introductionmentioning

confidence: 99%

“…To tackle the global accumulation of coherent errors for such long-term simulation, we follow the method in Ref. [26] and use a relativistic volume-preserving algorithm (VPA) [32]. As a geometric algorithm, the relativistic VPA possesses long-term numerical accuracy and stability [24,25,[31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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Multi-scale full-orbit analysis on phase-space behavior of runaway electrons in tokamak fields with synchrotron radiation

2016

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In this paper, the secular full-orbit simulations of runaway electrons with synchrotron radiation in tokamak fields are carried out using a relativistic volume-preserving algorithm. Detailed phasespace behaviors of runaway electrons are investigated in different dynamical timescales spanning 11 orders. In the small timescale, i.e., the characteristic timescale imposed by Lorentz force, the severely deformed helical trajectory of energetic runaway electron is witnessed. A qualitative analysis of the neoclassical scattering, a kind of collisionless pitch-angle scattering phenomena, is provided when considering the coupling between the rotation of momentum vector and the background magnetic field. In large timescale up to one second, it is found that the initial condition of runaway electrons in phase space globally influences the pitch-angle scattering, the momentum evolution, and the loss-gain ratio of runaway energy evidently. However, the initial value has little impact on the synchrotron energy limit. It is also discovered that the parameters of tokamak device, such as the toroidal magnetic field, the loop voltage, the safety factor profile, and the major radius, can modify the synchrotron energy limit as well as the strength of neoclassical scattering.The maximum runaway energy is also proved to be lower than the synchrotron limit when the magnetic field ripple is considered.

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“…For example, at t = 3. agrees with the numerical results in Ref. [26] and offers a direct description of the origin of collisionless pitch-angle scattering.…”

Section: Runaway Dynamics In T C -Timescalesupporting

confidence: 90%

Section: Runaway Dynamics In T C -Timescalementioning

confidence: 66%

Section: Physical Model and Numerical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-scale full-orbit analysis on phase-space behavior of runaway electrons in tokamak fields with synchrotron radiation

2016

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Symplectic integrators with adaptive time step applied to runaway electron dynamics

et al. 2019

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Summary of the fundamental plasma physics session in the first AAPPS-DPP conference

Hao

Diamond

2019

Rev. Mod. Plasma Phys.

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Understanding of fundamental plasma physics contributes to progress in plasma science in many fields, such as magnetic confinement fusion, solar/space physics and application of plasma techniques. Intersecting common fundamental problems stimulate cross-fertilization of different topical areas. This paper summarizes highlights of progress reported in the Fundamental Plasma Physics Session of the 1st conference of Association of Asia Pacific Physical Societies-Division of plasma physics (AAPPS-DPP). Progress in the following fields is reviewed: (i) basic plasma theory; (ii) self-organization; (iii) reconnection and particle acceleration; (iv) magneto-hydrodynamics (MHD) instabilities and energetic particle physics; (v) magnetic confinement physics fundamentals; and (vi) exploiting fundamentals for performance.

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Collisionless pitch-angle scattering of runaway electrons

Cited by 22 publications

References 51 publications

Multi-scale full-orbit analysis on phase-space behavior of runaway electrons in tokamak fields with synchrotron radiation

Multi-scale full-orbit analysis on phase-space behavior of runaway electrons in tokamak fields with synchrotron radiation

Symplectic integrators with adaptive time step applied to runaway electron dynamics

Summary of the fundamental plasma physics session in the first AAPPS-DPP conference

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