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Abstract

The centrifuge hydrogen pellet injection system at ASDEX Upgrade has been extended for inboard launching. Successful and efficient inboard pellet refuelling was realized up to pellet velocities of about 400 ms{-1}. In order to achieve maximum available pellet particle rates of the system still at the low centrifuge revolution needed in this velocity range, the injector has been modified. Thus, operational conditions have been developed yielding the potential to inject pellets at rather low speed but high repetition rate. Since pellets injected from the inboard are obviously not hampered by the low velocity but show better performance that fast pellets injected from the outside, this scheme seems to allow for an efficient and flexible particle refuelling of hot plasmas. The system is now capable of launching pellet series at rates up to 60 Hz at a speed of 240 ms{-1}. With the biggest available pellet size, this enables a pellet particle flux of 2.6E22 s{-1}.

Additional information

Authors: LANG P T, Max-Planck-Insitut für Plasmaphysik, Garching bei München (DE);CIERPKA P, Max-Planck-Insitut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 69 (1998) No. 7, pp. 2806-2807
Record Number: 199811109 / Last updated on: 1998-09-28
Category: PUBLICATION
Original language: en
Available languages: en