Conveners
4th Session: Tuesday AM1
- Ursel Fantz (MAx-Planck-Institut fuer Plasmaphysik)
Fundamental data are indispensable to set up a numerical simulation model to predict the amount of current extracted from an ion source. Surface recombination process plays a decisive role for determining the proton ratio in hydrogen plasma ion species, and the data on recombination coefficients have been accumulated for elements used for ion source wall materials [1]. The surface conditions...
Tiny amounts of caesium (Cs) injection into negative ion sources enhances the density of hydrogen/deuterium negative ions (H$^-$/ D$^-$ ions) drastically. Sequential processes through the production to extraction of negative ion is essential to understand the negative-ion dynamics from physics point of view and to improve the performance of negative ion source from engineering point of view. ...
The development and upgrade of ion sources for accelerators depends more and more on the optimization of the microwave-to-plasma coupling. Proton sources require to optimize the electron energy distribution function (EEDF) in the range of a few tens of eV. Multicharged ions sources require the optimization of EEDF in the keV scale depending on the needed charge state. The energy tail of EEDF...
Low temperature hydrogen plasmas of positive (H$^{+}$, H$^{2+}$, D$^{+}$) and negative (H$^{-}$, D$^{-}$) ion sources are strong sources of vacuum ultraviolet (VUV) radiation. Theoretical calculations based on fundamental conservation laws and reaction cross sections show that at least $10$ % of the applied plasma heating power is dissipated via photon emission. The theoretical result is...
A versatile platform for basic researches LEAF or Low Energy Accelerator Facility has been launched at IMP. In order to meet the beam intensity requirements of highly charged heavy ions, a 45 GHz superconducting ECR ion source FECR (a Fourth generation ECR ion source) is under intense R&D at IMP. Therefore, we introduced a 45 GHz gyrotron system which is capable of providing output power up to...
