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Title: Electric field induced Lyman-α emission of a hydrogen beam for electric field measurements

Electric field induced Lyman-α emission is a new way of measuring weak electric fields in vacuum and in a plasma. It is based on the emission of Lyman-α radiation (121.6 nm) by a low-energy metastable H atom beam due to Stark-quenching of the 2s level induced by the field. In this paper, we describe the technique in detail. Test measurements have been performed in vacuum between two plates polarized at a controlled voltage. The intensity of emitted radiation, proportional to the square of the field modulus, has been recorded by a lock-in technique, which gives an excellent signal to noise ratio. These measurements provide an in situ calibration that can be used to obtain the absolute value of the electric field. A diagnostic of this type can help to address a long standing challenge in plasma physics, namely, the problem of measuring electric fields without disturbing the equilibrium of the system that is being studied.
Authors:
;  [1] ;  [2] ;  [3]
  1. Aix-Marseille Université, CNRS, PIIM UMR 7345, FR-13397 Marseille Cedex 20 (France)
  2. Department of Fusion Plasma Physics, Royal Institute of Technology (KTH), Teknikringen 31, 100 44 Stockholm (Sweden)
  3. CAMECA SAS - 29 Quai des Grésillons, 92622 Gennevilliers Cedex (France)
Publication Date:
OSTI Identifier:
22483243
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; CALIBRATION; ELECTRIC FIELDS; ELECTRIC POTENTIAL; EMISSION; HYDROGEN; PLASMA; SIGNAL-TO-NOISE RATIO