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Lamb-shift and electric field measurements in plasmas

机译：等离子体中的羔羊换档和电场测量

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摘要

The electric field is a quantity of particular relevance in plasma physics. Indeed, its fluctuations are responsible for different macroscopic phenomena such as anomalous transport in fusion plasmas. Answering a long-standing challenge, we offer a new method to locally and non-intrusively measure weak electric fields and their fluctuations in plasmas, by means of a beam of hydrogen ions or atoms. We present measurements of the electric field in vacuum and in a plasma where Debye shielding is measured. For the first time, we have used the Lamb-shift resonance to measure oscillating electric fields around 1 GHz and observed the strong enhancement of the Lyman-alpha signal. The measurement is both direct and non-intrusive. This method provides sensitivity (mV cm(-1)) and temporal resolution (ns) that are three orders higher compared to current diagnostics. It thus allows measuring fluctuations of the electric field at scales not previously reached experimentally.
机译：电场是等离子体物理学中的特定相关性。 实际上，它的波动对不同的宏观现象（如异常运输）负责融合等离子体。 回答了一个长期挑战，我们通过氢离子或原子的束提供了局部和非侵入性的弱电场及其在等离子体中的波动。 我们在真空中呈现电场的测量和测量去脱模的等离子体。 首次使用Lamb型转变共振来测量振荡电场约为1 GHz，并观察到Lyman-alpha信号的强大增强。 测量既直接又非侵入。 该方法提供灵敏度（MV CM（-1））和时间分辨率（NS），与当前诊断相比，三个订单更高。 因此，它允许在先前未经实验达到的尺度处测量电场的波动。

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