# Physics of a magnetic filter for negative ion sources. II. E Multiplication-Sign B drift through the filter in a real geometry

## Abstract

The physics of a magnetic filter under conditions similar to those of the negative ion source for the ITER neutral beam injector is analyzed with the help of a two-dimensional particle-in-cell Monte Carlo Collisions model. A detailed analysis of the different terms of the electron momentum equations shows how diamagnetic and drift currents can be dominant in different regions of the filter. Electron transport through the filter is due to an E Multiplication-Sign B drift current on one side of the chamber induced by the presence of the chamber walls perpendicular to the electron diamagnetic current. The filter design of the ITER negative ion source, which does not allow a closed electron diamagnetic current, induces an asymmetry of the plasma that is analyzed with the particle model. It is shown that electron transport through the filter in this geometry is very different from the transport in an ideal, one-dimensional magnetic filter often considered in the literature and described in detail in the companion paper [Boeuf et al., Phys. Plasmas 19, 113509 (2012)].

- Authors:

- LAboratoire PLAsma et Conversion d'Energie (LAPLACE), Universite de Toulouse, Bt. 3R2, 118 Route de Narbonne, F-31062 Toulouse Cedex 9 (France)

- Publication Date:

- OSTI Identifier:
- 22068933

- Resource Type:
- Journal Article

- Journal Name:
- Physics of Plasmas

- Additional Journal Information:
- Journal Volume: 19; Journal Issue: 11; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 43 PARTICLE ACCELERATORS; ANIONS; BEAM INJECTION; CHARGED-PARTICLE TRANSPORT; ELECTRIC CURRENTS; ELECTRIC FIELDS; ELECTRONS; ITER TOKAMAK; MAGNETIC FILTERS; MONTE CARLO METHOD; ONE-DIMENSIONAL CALCULATIONS; PARTICLE MODELS; PLASMA; TWO-DIMENSIONAL CALCULATIONS

### Citation Formats

```
Boeuf, J. P., Claustre, J., Chaudhury, B., and Fubiani, G.
```*Physics of a magnetic filter for negative ion sources. II. E Multiplication-Sign B drift through the filter in a real geometry*. United States: N. p., 2012.
Web. doi:10.1063/1.4768804.

```
Boeuf, J. P., Claustre, J., Chaudhury, B., & Fubiani, G.
```*Physics of a magnetic filter for negative ion sources. II. E Multiplication-Sign B drift through the filter in a real geometry*. United States. doi:10.1063/1.4768804.

```
Boeuf, J. P., Claustre, J., Chaudhury, B., and Fubiani, G. Thu .
"Physics of a magnetic filter for negative ion sources. II. E Multiplication-Sign B drift through the filter in a real geometry". United States. doi:10.1063/1.4768804.
```

```
@article{osti_22068933,
```

title = {Physics of a magnetic filter for negative ion sources. II. E Multiplication-Sign B drift through the filter in a real geometry},

author = {Boeuf, J. P. and Claustre, J. and Chaudhury, B. and Fubiani, G.},

abstractNote = {The physics of a magnetic filter under conditions similar to those of the negative ion source for the ITER neutral beam injector is analyzed with the help of a two-dimensional particle-in-cell Monte Carlo Collisions model. A detailed analysis of the different terms of the electron momentum equations shows how diamagnetic and drift currents can be dominant in different regions of the filter. Electron transport through the filter is due to an E Multiplication-Sign B drift current on one side of the chamber induced by the presence of the chamber walls perpendicular to the electron diamagnetic current. The filter design of the ITER negative ion source, which does not allow a closed electron diamagnetic current, induces an asymmetry of the plasma that is analyzed with the particle model. It is shown that electron transport through the filter in this geometry is very different from the transport in an ideal, one-dimensional magnetic filter often considered in the literature and described in detail in the companion paper [Boeuf et al., Phys. Plasmas 19, 113509 (2012)].},

doi = {10.1063/1.4768804},

journal = {Physics of Plasmas},

issn = {1070-664X},

number = 11,

volume = 19,

place = {United States},

year = {2012},

month = {11}

}