Conveners
3rd session
- Dezhi Chen (Huazhong University of Science and Technology)
Dr
Haruhisa Nakano
(National Institute for Fusion Science)
03/09/2018, 13:40
H– and D– sources for fusion, accelerators and other applications
Oral
Degradations of ion source performance were found in deuterium operation of negative ion source for Neutral Beam Injector (NBI) on Large Helical Device (LHD): lower ion beam current efficiency for discharge power, higher electron current ratio to ion beam current and more intense Cs atom emission (related with sputtering) in the same Cs tank temperature operation. We changed pressure inside...
Prof.
Motoi Wada
(Doshisha University)
03/09/2018, 14:10
Fundamental processes and modelling
Oral
Plasma surface interaction in a cesiated negative hydrogen (H$^-$) ion source determines the overall Cs consumption rate of the source. The Cs coverage on the plasma grid (PG) surface is reduced mainly by two mechanisms. The first mechanism is the removal of Cs from the PG by direct sputtering, or ion induced desorption. The second is the deposition of atoms that form a layer above the Cs...
Dr
Mamiko SASAO
(Doshisha University)
03/09/2018, 14:40
H– and D– sources for fusion, accelerators and other applications
Oral
Recently, it has been reported that a high production rate of negative hydrogen
ion (H-) was observed from a nano-porous C12A7 electride surface immersed in
hydrogen/deuterium low-pressure plasmas [1]. The H- ion energy spectrum seemed to indicate that the dominant process leading to H- ion formation was through kinetic desorption induced by low energy ions. Fundamental understanding of the...
