8th International symposium on Negative Ions, Beams and Sources - NIBS'22

Session

Oral session 5

4 Oct 2022, 10:50

Auditorium (Orto Botanico)

3. Numerical study of RF power coupling in fusion-relevant single- and multi-driver H^- ion sources

Dominikus ZIELKE

04/10/2022, 10:50

12. Numerical simulations of sources or beams

Oral

ITER's large and powerful neutral beam injection system is based on a modular concept, where eight cylindrical ’drivers’ are attached to one common expansion and extraction region. In each driver, a plasma is sustained via inductive coupling with powers of up to 100 kW at a driving radio-frequency (RF) of 1 MHz to produce fusion-relevant hydrogen beams. These high powers impose great stress on...

7. SImplified fluid models of radiofrequency and plasma density for NIO1 and design

Marco CAVENAGO (INFN-LNL)

04/10/2022, 11:20

13. RF/inductively-coupled sources

Oral

Inductive coupling of radiofrequency power to plasma is a complicate process, since it depends from the density of plasma itself for two major reason: (1) ionization is a chain reaction process; (2) with no Faraday screen (as in many sources and until now NIO1), a capacitative coupling may mix with inductive coupling. Several empirical 2D model can be developed, depending on collisional...

52. Investigation of spatially resolved plasma parameter and potential distributions at the BATMAN Upgrade ion source

Stefan BRIEFI

04/10/2022, 11:50

13. RF/inductively-coupled sources

Oral

In H$^–$ ion sources for neutral beam heating applications, the creation of negative ions relies on the surface conversion of H atoms and positive ions at the plasma grid surface. The yield of this process is strongly influenced by the energy of the impacting particles. In general, a higher energy or velocity of H or H$^+_x$ results in a higher conversion rate. However, the velocity of the...

80. Construction of a Filament-RF driven hybrid negative ion source at NIFS

Katsuyoshi TSUMORI

04/10/2022, 12:20

13. RF/inductively-coupled sources

Oral

Reduction of beamlet divergence angle is one of the most important targets of negative ion sources driven with Radio-Frequency (RF) to decrease the damages on the accelerator grid and improve the beam injection efficiency. Minimum beamlet divergence of RF driven source is ~12 mrad and is much wider than the divergence accelerated from Filament-Arc (FA) drive sources; required beam divergences...