Recovery of a weakly magnetized negative-ion plasma after photodetachment

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PhysRevE.55.956· OSTI ID:470823

Ivanov, A A; Sionov, A B; El Balghiti-Sube, F; Bacal, M ^[1]

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1. Laboratoire de Physique des Milieux Ionises, Laboratoire du CNRS, Ecole Polytechnique, 91128 Palaiseau (France)

The experimental investigation of the negative-ion recovery after photodetachment was effected using the two-laser-beam technique in the neighborhood of the extraction opening of a negative-ion source, a weakly magnetized plasma region limited by a positively biased plasma electrode. It was found that the application of a positive bias to the plasma electrode reduces the recovery time. This quicker recovery was attributed to the presence in the plasma of a directed negative-ion flow, crossing the laser channel, whose velocity increases as the positive bias of the plasma electrode is increased. The choice of a self-similar variable allows the negative-ion flow velocity to be determined from the shift of the experimental recovery curves, and the negative-ion temperature from the initial phase of the recovery. As expected, increasing the plasma electrode positive bias does not change the negative-ion temperature. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 470823
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 1 Vol. 55; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANIONS
BEAM CURRENTS
BEAM EXTRACTION
BOLTZMANN-VLASOV EQUATION
CHARGED-PARTICLE TRANSPORT
ELECTRON DETACHMENT
ION SOURCES
ION TEMPERATURE
LASER RADIATION
MAGNETIC FIELDS
PLASMA DENSITY
PLASMA DIAGNOSTICS