Hydrogen negative ion beam extraction with Cs

10 Sep 2020, 08:00
2h
Poster H– and D– sources for fusion, accelerators and other applications P3

Speaker

Min Park (National Fusion Research Institute (NFRI))

Description

A negative ion beam source of 200 keV / 0.5 A has been under development at National Fusion Research Institute (NFRI). Recently, a Cs dispenser was equipped to feed the Cs to enhance the source performance. To see the Cs seeding effect, preliminary short-pulse beam extraction experiments were carried out with 50 keV accelerator prior to the installation of 200 keV accelerator. It was confirmed that the performance of Cs dispenser was maintained for more than 2 hours and the beam currents were increased by about 2 times. The co-extracted electron currents were drastically decreased. It is necessary to find optimum operational conditions such as the current waveform of Cs dispenser to control the Cs feeding rate and particularly the plasma grid (PG) temperature which is the main factor for the deposition rate or the thickness of Cs on the PG surface.

Primary author

Min Park (National Fusion Research Institute (NFRI))

Co-authors

Byungkeun Na (National Fusion Research Institute) Dr Tae-Seong Kim (Korea Atomic Energy Research Institute) Dr Seung Ho Jeong (Korea Atomic Energy Research Institute) Dr Jong-Gu Kwak (National Fusion Research Institute)

Presentation Materials