title: Extracted H(-) ion current enhancement due to caesium seeding at different plasma grid bias.
abstract: This paper discusses the possibility that there is an enhancement of volume production due to gettering of atomic hydrogen by the caesium deposited on the walls, which reduces the negative ion destruction by associative and non-associative detachment. Such an enhancement would take place for all plasma grid bias voltages. Furthermore at plasma grid bias voltages higher than the plasma potential there is flow of the negative ions from the bulk plasma.
authors.affiliation: UPMC, LPP, Ecole Polytechnique, Université Paris-Sud 11, UMR CNRS 7648, Palaiseau, France.
authors.forename: Marthe
authors.initials: M
authors.lastname: Bacal
authors.affiliation: EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom.
authors.forename: Roy
authors.initials: R
authors.lastname: McAdams
authors.affiliation: EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Surrey