10th International symposium on Negative Ions, Beams and Sources - NIBS'26

Session

S1: Chairperson - Vincenzo Laporta, ISTP-CNR

Sep 22, 2026, 8:10 AM

Conference Room (Prestige Lakeside Resort Nelson)

49. Advanced Negative Ion Source concept for Neutral Beam Injectors

Gwenael Fubiani (LAPLACE, Universite de Toulouse, CNRS)

9/22/26, 8:10 AM

Invited

The negative ion source currently being developed for the ITER neutral beam injector (NBI) suffers from two fundamental design shortcomings: (i) a plasma asymmetry along the direction parallel to the plasma grid, and (ii) an excessively elevated plasma potential that may degrade beam divergence within the accelerator. To overcome these issues, we propose a novel source architecture designated...

79. Simulation and Experimental Study on the Ejected Electrons from Negative Ion sources on the CRAFT NNBI test facility

yuwen yang (Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences)

9/22/26, 8:35 AM

Contributed Oral

In the accelerator of negative ion source, electrons are easily generated via stripping loss of negative ions, background gas ionization, and secondary electron emission from electrodes. Under the effect of electric and magnetic fields, these electrons acquire high energy and exhibit a large divergence angle. Once ejected from the ion source, the energetic electrons can directly strike on the...

72. Conceptual design of a negative-ion-based neutral beam module for an FRC reactor prototype.

Prof. Alexandr Ivanov (TAE Technologies)

9/22/26, 8:55 AM

Invited

In a future fusion reactor prototype under development at TAE Technologies, Inc., negative-ion-based neutral beams with a total power of 20 MW are used to sustain the p-B reaction in the plasma. The neutral beam system will comprise four injector modules, each capable of producing a 5 MW, 1 MeV steady-state neutral beam. The conceptual design of the injector module features a spatially...

40. Alternative Solution to Address the Challenge of Negative Ion Sources for Fusion

Lenaic Couedel (CNRS/Aix-Marseille Université)

9/22/26, 9:20 AM

Invited

The project addresses a critical challenge in fusion energy: replacing caesium (Cs) in negative-ion (NI) sources for Neutral Beam Injectors (NBIs), which are essential for heating and driving plasma current in tokamaks like ITER. While Cs is effective, it poses maintenance and safety issues due to its reactivity and accumulation, which would be problematic in nuclear environments. This work...