Journal articles
Lamb-shift and electric field measurements in plasmas
Abstract : 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.
Cited literature [15 references]
https://hal-amu.archives-ouvertes.fr/hal-01466155
Contributor : Laurence Chérigier-Kovacic Connect in order to contact the contributor
Submitted on : Thursday, February 16, 2017 - 9:11:33 AM
Last modification on : Tuesday, February 8, 2022 - 8:56:01 AM
Long-term archiving on: : Wednesday, May 17, 2017 - 12:23:03 PM
Contributor : Laurence Chérigier-Kovacic Connect in order to contact the contributor
Submitted on : Thursday, February 16, 2017 - 9:11:33 AM
Last modification on : Tuesday, February 8, 2022 - 8:56:01 AM
Long-term archiving on: : Wednesday, May 17, 2017 - 12:23:03 PM
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Doveil_2017_Plasma_Phys._Contr...
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