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Examination of argon metastable atom velocity distribution function close to a conducting wall

Abstract : Experimental study of the ion current to a cylindrical Langmuir probe taking into account a finite ion temperature J. Appl. Phys. 111, 063303 (2012) On the generation and disruption of a picosecond runaway electron beam during the breakdown of an atmospheric-pressure gas gap Appl. Phys. Lett. 100, 134102 (2012) First-order finite-Larmor-radius fluid modeling of tearing and relaxation in a plasma pinch Phys. Plasmas 19, 055905 (2012) Additional information on Phys. Plasmas The spatial evolution of the 1s 5 metastable argon atom velocity distribution function is recorded in the sheath and pre-sheath regions of a metallic wall using laser induced fluorescence (LIF) spectroscopy. Metastable argon atom temperature and fluid velocity are computed from measured data. Owing to the loss of metastable argon atom after a collision with the surface, the atom temperature seemingly decreases and the velocity increases when approaching the wall. These artifacts are carefully examined and explained in terms of changes in the metastable argon atom distribution function. In addition, the atom nonelastic reflection coefficient is computed from the ratio of outward to inward atom flux to the surface. This study indicates less than 1% of metastable atoms survive a collision with the metallic wall
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N. Claire, S. Mazouffre, C. Rebont, F. Doveil. Examination of argon metastable atom velocity distribution function close to a conducting wall. Physics of Plasmas, American Institute of Physics, 2012, 19 (3), pp.32108 - 32108. ⟨10.1063/1.3692729⟩. ⟨hal-01787091⟩



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