H− and D− temperature in volume sources

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  • R. Leroy
    Laboratoire de Physique des Milieux Ionisés, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau, France
  • M. Bacal
    Laboratoire de Physique des Milieux Ionisés, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau, France
  • P. Berlemont
    Laboratoire de Physique des Milieux Ionisés, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau, France
  • C. Courteille
    Laboratoire de Physique des Milieux Ionisés, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau, France
  • R. A. Stern
    Laboratoire de Physique des Milieux Ionisés, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau, France

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<jats:p>A new technique using laser induced photodetachment has been developed for measuring the negative ion temperature in H− and D− sources. Using this technique, we have investigated the dependence of the negative ion temperature on source parameters such as pressure, discharge current, and electron temperature. Simultaneous measurements of negative ion density, temperature, and extracted current lead to the conclusion that the extracted negative ion current is, at most, equal to the thermal flux.</jats:p>

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