Photodetachment diagnostics of plasma with a high {ital n}{sub {minus}}/{ital n}{sub {ital e}} ratio
- Laboratoire de Physique des Milieux Ionises, Laboratoire du C.N.R.S., Ecole Polytechnique, 91128 Palaiseau Cedex (France)
The method of determination of the electron and H{sup {minus}} densities in the photodetachment experiment, particularly when performed in plasma with a high {ital n}{sub {minus}}/{ital n}{sub {ital e}} ratio, is discussed. Some essential peculiarities of this method arise from the creation of a potential well in plasma after photodetachment. The well captures the excess electrons, generated by the laser beam, and supports the quasineutrality in the plasma. The method is applied to the diagnostics of the extraction region of the negative ion source {open_quote}{open_quote}Camembert III.{close_quote}{close_quote} The dependencies of the negative ion and electron densities, and of the electron temperature upon the plasma electrode voltage, are obtained and discussed. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 284624
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 6 Vol. 67; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Photodetachment of H[sup [minus]] with excitation to H([ital N]=2)
The role of the perturbed plasma potential in the dynamic plasma response to photodetachment