Innovative measurement of Debye shielding in plasmas by Lyman-α radiation of a probing metastable hydrogen beam

Lejeune, A.; Chérigier-Kovacic, Laurence; Doveil, Fabrice

doi:10.1063/1.4865363

Cited by 1 publication

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“…At the resonance corresponding to an oscillating electric field with frequency ν ν = 0 , the above calculation gives an amplification factor of more than two orders of magnitude, which is independent of the value of the field. All these predictions were confirmed by our previous measurements for an electric field created between two biased parallel plates in vacuum [6,8,[12][13][14]17].…”

Section: Principle Of the Diagnosticsupporting

confidence: 80%

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Lamb-shift and electric field measurements in plasmas

Doveil¹,

Chérigier-Kovacic²,

Ström³

2016

Plasma Phys. Control. Fusion

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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-α 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.

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Section: Principle Of the Diagnosticsupporting

confidence: 80%

“…The experimental set-up has been described previously [6,8,13,17]. Figure 3 shows a picture of the experimental set-up and the main parts of the apparatus with the beam generation part, the measurement region and the detector.…”

Section: Description Of the Diagnosticmentioning

confidence: 99%