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A nine barrel pellet injector has been built and tested in Grenoble with 1.5 mm D(2) pellets in the range of 400 m/s to 1200 m/s by using one stage gas guns. The pellets are formed simultaneously in the barrels by an in situ condensation technique in the 1-6 mm3 range. The firing of the pellets provides a large degree of freedom as barrels can be grouped, and the delay between the individual guns can be chosen between a millisecond and ten seconds, or even more. This choice allows injection at any time of the TEXTOR plasma pulse. The barrels end in a system for the separation of the propellant gas from the pellets reducing the amount of gas to 1.0 E-3 to 1.0 E-4 of its initial value. The system built in Jülich consists of three sets of differentially pumped volumes combined with fast closing valves. In addition, this unit is equipped with diagnostics for the pellet mass and the pellet velocity. The barrel unit and the gas separation unit have been combined and commonly operated. The paper describes in detail the commissioning test results of the nine-shot pellet injector.

Additional information

Authors: DISDIER F, CEA, CEN Grenoble (FR);CLAUDET G, CEA, CEN Grenoble (FR);LAFFERRANDERIE J, CEA, CEN Grenoble (FR);VIARGUES F, CEA, CEN Grenoble (FR);FINKEN K H, Forschungszentrum Jülich GmbH (KFA) (DE);KOHLHAAS W, Forschungszentrum Jülich GmbH (KFA) (DE);MEIER H, Forschungszentrum Jülich GmbH (KFA) (DE);WEGENER H P, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: 17th Symposium on Fusion Technology, Rome (IT) : Proceedings, Vol. 1 (1993) pp. 467-471
Record Number: 199310999 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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