Conveners
5th Session: Tuesday AM2
- Beatrix Schunke (ITER Organization)
Particle-in-cell (PIC) codes are used since the early 1960s for calculating self-consistently the motion of charged particles in plasmas, taking into account external electric and magnetic fields as well as the fields created by the particles itself. One main feature of PIC codes is that they resolve the Debye length, i.e. they can calculate the transition between the quasi-neutral plasma and...
High-voltage negative-ion based injector is under development at Budker Institute of Nuclear Physics. Its essential feature is beam transport from the multiaperture source to a single-aperture accelerating tube through a low energy beam transport line (LEBT). This scheme permits to purify the beam from the co-streaming fluxes of fast hydrogen atoms, gas molecules, cesium vapor. As a result,...
We report on the characteristics of the beam-generated plasma in the multibeamlet case of a large hydrogen negative ion (H$^-$) beam at NIFS. The plasma potential, and the energy of secondary particles in the drift region of an ion beam, offer an insight into the mechanisms that allow beam transport in low pressure gasses.
The first measurements reported here were made by means of a...
Deuterium beam operation on neutral beam injectors (NBI) have been carried out successfully in the Large Helical Device (LHD) in 2017. We had operated three hydrogen negative-ion and two positive-ion based NBI’s since 1998 and 2005, respectively. In 2017, the injection beam power has reached 31 MW used five beam lines, which gave us a new operation region for high ion temperature plasma....
