Tungsten injector for scrape-off layer impurity transport experiments in the Tore Supra tokamak

M Kočan; J P Gunn; T Lunt; O Meyer; J-Y Pascal

doi:10.1063/1.4812341

Tungsten injector for scrape-off layer impurity transport experiments in the Tore Supra tokamak

Rev Sci Instrum. 2013 Jul;84(7):073501. doi: 10.1063/1.4812341.

Authors

M Kočan¹, J P Gunn, T Lunt, O Meyer, J-Y Pascal

Affiliation

¹ Max-Planck-Institut für Plasmaphysik, EURATOM Association Boltzmannstr. 2, D-85748 Garching, Germany.

PMID: 23902057
DOI: 10.1063/1.4812341

Abstract

This paper describes the design and operation of a new tungsten (W) injection system for impurity transport experiments in the Tore Supra tokamak. The system is mounted on a reciprocating manipulator and injects a controlled amount of gaseous tungsten hexacarbonyl, W(CO)6 at arbitrary depth in the scrape-off layer, using an inertially activated valve. Injected W(CO)6 is dissociated in the plasma, forming a radially localized plume of W atoms. The injector does not require an external gas feed and can perform a large number of injections from an on-board reservoir of W(CO)6. Some examples of W injections in Tore Supra are included, demonstrating successful operation and discussing some technical issues of the injector prototype.