Negative Ion Source Technology

Hopman, H. J.; Heeren, R. M. A.

doi:10.1007/978-1-4615-3400-6_13

Cited by 4 publications

(1 citation statement)

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“…The development of high-current H-minus (or D-minus) sources is of considerable interest for future tokamaks [1] because it opens the possibility to realize high-current neutral beams of higher energy for plasma heating than with proton beams because the beam neutralization can be more efficient with high-energy negative ions than with high-energy protons. The magnetic multipole ion source is considered an interesting candidate whereby the production of negative ions takes place in the plasma volume [2]. This ion source is being investigated with the aim of optimizing the negative ion yield [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison of atomic and molecular densities and temperatures of deuterium and hydrogen plasmas in a magnetic multipole source

Wagner

Dikmen

Döbele

1998

Plasma Sources Sci. Technol.

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Resonance absorption of narrow-bandwidth coherent vacuum UV radiation is applied to hydrogen and deuterium plasmas in a magnetic multipole source to determine populations of rovibronic levels of the electronic molecular ground state as well as atomic densities and temperatures. Variations of atomic densities are investigated as a function of discharge parameters in two different regions of the plasma source: the central region and close to the wall.A strong dependence of the atomic density on pressure and discharge current is observed as well as a considerable difference between the values in the central and the edge regions. The differences in atomic densities between discharges in hydrogen and deuterium are small. The populations of rovibronic levels of H 2 and D 2 -determined only in the central region-do not exhibit significant differences for the levels investigated (v = 2 to 5 for H 2 and v = 3 to 6 for D 2 )-the distributions are close to Boltzmann. Molecular translation temperatures-close to room temperature-are in good agreement with the rotational temperatures determined from the population of the first four rotational states of the v = 2 state of hydrogen and the first six rotational states of the v = 3 state of deuterium. The fraction of cold atoms present in the discharges exhibits a similar temperature.

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Section: Introductionmentioning

confidence: 99%