2014/01/27 by D Wünderlich, D. Wünderlich, S Mochalskyy +6
Engineering · Physics and Astronomy · #Magnetic confinement fusion research #Particle Accelerators and Free-Electron Lasers #Particle accelerators and beam dynamics
paper · doi:10.1088/0963-0252/23/1/015008
openalex publication_date 2014/01/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The neutral beam injection system for ITER is based on a large (A source = 1.9 × 0.9 m 2 ) negative hydrogen or deuterium ion source.In this source negative ions are produced in a low-pressure (p fill ≈ 0.3 Pa) plasma by conversion of atoms and protons on a caesiated molybdenum surface with low work function.Then the negative ions are transported through the plasma to the extraction system where extraction of these ions and also co-extraction of electrons take place.This paper describes the status of the modeling activities connected with the negative ion test facilities of IPP Garching.It is illustrated that these modelling activities constitute a strong support of the experimental activities connected with the development of the negative ion source for ITER NBI.Several numerical codes developed in the past years -in close collaboration with the experiment -and their results are introduced.Focus is laid on the production, transport and extraction of negative hydrogen ions and on the inevitable co-extraction of electrons.1.9 m 0.59 m 1.0 m Figure 1.Size scaling from the IPP prototype source to the ion source of the ELISE test facility to the full negative ion source for ITER NBI.