The Textor Nine Shot Pellet Injector

Disdier, F.; Claudet, G.; Lafferranderie, J.; Viargues, F.; Finken, K. H.; Kohlhaas, W.; Meier, H.; Wegener, Hans Peter

doi:10.1016/b978-0-444-89995-8.50086-2

Cited by 1 publication

(2 citation statements)

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“…TEXTOR-94 is equipped with a gas gun type nine shot pellet injector which provides pellets with a diameter of 1.5 mm and a length between 1 and 4 mm [19,20]. The particle content in each pellet can be adjusted between 5 × 10 18 and 1 × 10 20 , corresponding to up to 200% of the total number of electrons in the plasma before injection.…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…2, pellet injection results in a strong increase in the total number of electrons. After the initial increase to 3.7 × 10 20 , the number of electrons decreases to about 3.4 × 10 20 with a time constant of 22 ms. Then the number of electrons starts to increase again and after 300 ms a new equilibrium state is reached where the total number of electrons stays constant at about 3.5×10 20 . An initial decrease in particle content is also observed when a pellet is injected into an L mode discharge; however the slow increase (150 ms) of the density after the initial decay is a special feature of RI mode discharge conditions and has not yet been observed in any other discharge type.…”

Section: Pellet Fuelling In Radiative Improved Dischargesmentioning

confidence: 99%

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Pellet fuelling into radiative improved confinement discharges in TEXTOR-94

et al. 2000

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Normally pellet injection in strongly heated discharges leads at most to a relatively short improvement of the energy and particle confinement times. In contrast to this finding, the radiative improved (RI) mode plasma of TEXTOR-94 is a very well suited target for pellet injection: the interaction of a pellet with the high density plasma together with the radiatively cooled edge leads in the best cases to an improved energy confinement time which lasts to the end of the heating phase. The pellet injection causes at first a density increase; this phase is followed by a quick partial particle loss and later an increase to a quasi-stationary value. Because of the linear density dependence of RI mode confinement this leads to an additional increase in energy confinement time.

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Section: Experimental Conditionsmentioning

confidence: 99%

Section: Pellet Fuelling In Radiative Improved Dischargesmentioning

confidence: 99%