Control and Effect of Long Pulse Discharge in ATF

H. Yamada; A. Komori; S. Morimoto; O. Motojima; A. Sagara; M. Sato; M. Murakami; T. C. Jernigan; T. S. Bigelow; R. J Colchin; A.C. England; C. C. Klepper; J.F. Lyon; J. E. Simpkins; J. B Wilgen

doi:dx.doi.org/10.13182/FST95-A11947075

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Home / Publications / Journals / Fusion Science and Technology / Volume 27 / Number 3T

Control and Effect of Long Pulse Discharge in ATF

H. Yamada, A. Komori, S. Morimoto, O. Motojima, A. Sagara, M. Sato, M. Murakami, T. C. Jernigan, T. S. Bigelow, R. J Colchin, A.C. England, C. C. Klepper, J.F. Lyon, J. E. Simpkins, J. B Wilgen

Fusion Science and Technology / Volume 27 / Number 3T / April 1995 / Pages 227-230

Helical Systems / dx.doi.org/10.13182/FST95-A11947075

Published:February 8, 2018

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A 4667-second long discharge has been obtained in the ATF torsatron. The total amount of the energy input was 330MJ. The set-up procedures, the control of plasma parameters, and the effect on the wall conditioning for the long pulse discharge are reported in this paper. Fast density feedback control is not useful for a long-pulse operation; control of the neutral pressure on a slower time scale is necessary. Long-pulse discharges are quite effective for wall conditioning. Valuable experiences have been accumulated in the future experiments planned for LHD.