Comment on "Upper limit to Landau damping in helicon discharges".
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منابع مشابه
Upper Limit to Landau Damping in Helicon Discharges
The uncommonly high rf absorption efficiency of helicon discharges has been thought to be caused by Landau damping of helicon waves and the concomitant acceleration of primary electrons. By constructing an energy analyzer that accounts for rf fluctuations in plasma potential, it is shown that Landau-accelerated electrons are too sparse to explain the ionization efficiency. Instead, rf absorptio...
متن کاملEvidence for Trivelpiece-Gould modes in a helicon discharge.
The high ionization efficiency of helicon discharges has been attributed to Landau damping and mode coupling to Trivelpiece-Gould (TG) modes. Though theory predicts the importance of TG modes, they have rarely been seen. Here they were detected directly by measuring their radiofrequency current with a J-dot probe, thus supporting the contention that TG modes play a role in these enigmatic plasm...
متن کاملRF absorption and ion heating in helicon sources.
Experimental data are presented that are consistent with the hypothesis that anomalous rf absorption in helicon sources is due to electron scattering arising from parametrically driven ion-acoustic waves downstream from the antenna. Also presented are ion temperature measurements demonstrating anisotropic heating (T( perpendicular)>T(parallel)) at the edge of the discharge. The most likely expl...
متن کاملTime-resolved measurements of the electron energy distribution function in a helicon plasma
Abstract An energy analyser with the capability of making time-resolved measurements of the instantaneous electron current in a radiofrequency (RF) plasma has been designed and constructed. This current is then reconstructed into the instantaneous I–V characteristic at various phases of the RF cycle. Results are shown for a helicon wave discharge under various conditions. From the first derivat...
متن کاملشبیه سازی ذره‌ای میرایی غیر خطی لانداؤ در پلاسمای برخوردی و غیر برخوردی
In this article, non-linear Landau damping and generation of BGK mode in non-magnetized plasma are studied by using particle simulation. As plasma environment consists of electrons and ions, it is simulated by particle method and it is supposed that ions are considered as a motionless background. On the other hand, electron’s dynamic is obtained from solving Newton’s equation and the electron...
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ورودعنوان ژورنال:
- Physical review letters
دوره 86 26 Pt 1 شماره
صفحات -
تاریخ انتشار 2001