The radial flux of 10 keV neutrals from the Asdex-Upgrade tokamak has been interpreted as a diagnostic of the radial electric field E-r near the plasma edge (Herrmann W and Asdex-Upgrade Team 1995 Phys. Rev. Lett. 75 4401), with the conclusion that E-r changes gradually at a transition from the L-mode confinement regime to the H-mode regime. In contrast to the Asdex-Upgrade results, a similar installation on the DIII-D tokamak finds no measurable signal in H-mode plasmas with deep E-r wells. Measurable signals only occur in plasmas with relatively large pitch-angle scattering rates at the plasma edge (or with anomalous beam-ion confinement). Large scattering rates require a large electron temperature and are invariably accompanied by deep ripple wells. The results suggest an alternative explanation for the gradual evolution of the neutral-particle signal from Asdex-Upgrade: as the H-mode pedestal develops, more beam ions are pitch-angle scattered into the phase space measured by the detector. [References: 38]
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机译：来自Asdex-Upgrade托卡马克的10 keV中性点的径向通量已被解释为对等离子体边缘附近的径向电场Er的诊断（Herrmann W和Asdex-Upgrade Team 1995 Phys。Rev. Lett。75 4401），其中结论是，Er在从L型限制态向H型态转变的过程中逐渐变化。与Asdex-Upgrade结果相反，在DIII-D托卡马克上进行的类似安装在具有深E-r阱的H型等离子体中找不到可测量的信号。可测量的信号仅出现在等离子边缘处具有相对大的俯仰角散射率的等离子中（或具有异常的束离子限制）。较大的散射速率需要较高的电子温度，并且必然伴有深的波纹阱。结果为Asdex-Upgrade中性粒子信号的逐渐演变提出了另一种解释：随着H型基座的发展，更多的束离子被俯仰角散射到探测器检测到的相空间中。 [参考：38]
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