A model for negative ion extraction and comparison of negative ion optics calculations to experimental results
Negative ion extraction is described by a model which includes electron diffusion across transverse magnetic fields in the sheath. This model allows a 2-dimensional approximation of the problem. It is used to introduce electron space charge effects in a 2-D particle trajectory code, designed for negative ion optics calculations. Another physical effect, the stripping of negative ions on neutral gas atoms, has also been included in the model; it is found to play an important role in negative ion optics. The comparison with three sets of experimental data from very different negative ion accelerators confirms that the model is capable of accurate predictions.
Bibliographic Reference: Report: EUR-CEA-FC1411 EN (1990)
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199011832 / Last updated on: 1994-12-02
Original language: en
Available languages: en