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(EXP1/03) Plasma Formation and First OH Experiments in GLOBUS-M Tokamak

V. K. Gusev1), S. V. Aleksandrov1), T. A. Burtseva2), I. N. Chugunov1), A. V. Dech1), G. A. Gavrilov1), V. E. Golant1), Yu. A. Kostsov2), S. V. Krikunov1), E. A. Kuznetsov4), R. G. Levin1), V. B. Minaev1), A. Mineev2), O. A. Minyaev3), E. E. Mukhin1), A. N. Novokhatskii1), Yu. V. Petrov1), K. A. Podushnikova1), E. Rumyantsev2), N. V. Sakharov1), V. V. Semenov1), V. M. Sharapov5), G. Yu. Sotnikova1), V. S. Uzlov1), V. Vasiliev2), M. I. Vildjunas1), V. A. Yagnov4)
 
1) A.F. Ioffe Physico-Technical Institute, Russian Academy of Science, St. Petersburg, Russia
2) D.V. Efremov Institute of Electrophysical Apparatus, St. Petersburg, Russia
3) Ioffe Fusion Technology, Ltd., St. Petersburg, Russia
4) TRINITI, Troitsk, Moscow Region, Russia
5) Institute of Physical Chemistry, Moscow, Russia

Abstract.  The paper reports results of experimental campaigns on plasma ohmic heating, performed during 1999-2000 on the spherical tokamak Globus-M. Later experimental results with tokamak fed by thyristor rectifiers are presented in detail. The toroidal magnetic field and plasma pulse duration in these experiments were significantly increased. The method of stray magnetic field compensation is described. The technology of vacuum vessel conditioning, including boronization of the vessel performed at the end of the experiments, is briefly discussed. Also discussed is the influence of ECR preioniziation on the breakdown conditions. Experimental data on plasma column formation and current ramp-up in different regimes of operation with the magnetic flux of the central solenoid (CS) limited to $ \sim$ 100 mVs are presented. Ramp-up of the plasma current of 0.25 MA for the time interval $ \sim$ 0.03 s with about 0.02 s flat-top at the toroidal field (TF) strength of 0.35 T allows the conclusion that power supplies, control system and wall conditioning work well. The same conclusion can be drawn from observation of plasma density behavior the density is completely controlled with external gas puff and the influence of the wall is negligible after boronization. The magnetic flux consumption efficiency is discussed. The results of magnetic equilibrium simulations are presented and compared with experiment.

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IAEA 2001