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首页> 外文期刊>Plasma physics and controlled fusion >Particle acceleration during merging-compression plasma start-up in the Mega Amp Spherical Tokamak
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Particle acceleration during merging-compression plasma start-up in the Mega Amp Spherical Tokamak

机译：在Mega AMP球形TOKAMAK中的合并压缩等离子体启动期间的粒子加速度

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Magnetic reconnection occurred during merging-compression plasma start-up in the Mega Amp Spherical Tokamak (MAST), resulting in the prompt acceleration of substantial numbers of ions and electrons to highly suprathermal energies. Accelerated field-aligned ions (deuterons and protons) were detected using a neutral particle analyser at energies up to about 20 keV during merging in early MAST pulses, while nonthermal electrons have been detected indirectly in more recent pulses through microwave bursts. However no increase in soft x-ray emission was observed until later in the merging phase, by which time strong electron heating had been detected through Thomson scattering measurements. A test-particle code CUEBIT is used to model ion acceleration in the presence of an inductive toroidal electric field with a prescribed spatial profile and temporal evolution based on Hall-MHD simulations of the merging process. The simulations yield particle distributions with properties similar to those observed experimentally, including strong field alignment of the fast ions and the acceleration of protons to higher energies than deuterons. Particle-in-cell modelling of a plasma containing a dilute field-aligned suprathermal electron component suggests that at least some of the microwave bursts can be attributed to the anomalous Doppler instability driven by anisotropic fast electrons, which do not produce measurable enhancements in soft x-ray emission either because they are insufficiently energetic or because the nonthermal bremsstrahlung emissivity during this phase of the pulse is below the detection threshold. There is no evidence of runaway electron acceleration during merging, possibly due to the presence of three-dimensional field perturbations.
机译：在Mega AMP球形Tokamak（MAST）中的合并压缩等离子体启动期间发生磁性重新连接，从而提示加速大量离子和电子以高度上涨的能量。在在早期桅杆脉冲合并期间使用中性粒子分析仪检测加速现场排列的离子（氘代和质子），同时通过微波突发在更新的脉冲中间接检测到非热电子电子。然而，在合并阶段之后，观察到软X射线发射的增加，通过汤森散射测量检测到时间强的电子加热。测试粒子代码Cuebit用于在电感环形电场存在下模拟离子加速，基于合并过程的Hall-MHD模拟的规定的空间轮廓和时间演变。模拟与实验观察的性质相似的性质产生粒子分布，包括快速离子的强场对准以及质子的加速度比氘核更高的能量。含有稀磁场对准的上班电子元件的等离子体的粒子细胞建模表明，至少一些微波突发可以归因于由各向异性快速电子驱动的异常多普勒不稳定性，这在软X中不会产生可测量的增强 - 射线消融是因为它们是充足的精力充分或因为在该脉冲的该阶段期间的非热Bremsstrahlung发射率低于检测阈值。在合并期间没有逃逸电子加速的证据，可能是由于存在三维场扰动的存在。

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