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(EXP3/08) Origin of Rapid Impurity Penetration to Plasma Center During Disruption in Tokamak T-11M

S. V. Mirnov¹⁾, A. M. Belov¹⁾, D. Yu. Prokhorov²⁾, A. G. Alekseyev¹⁾, I. N. Makashin^1)
 
1)TRINITI, Troitsk, Moscow reg. 142190 RUSSIA
²⁾ Institute of Nuclear Fusion, RSC ``Kurchatov Institute'', Moscow, 123182 RUSSIA

Abstract.  The results of impurity penetration studies at T-11M tokamak just before and during the disruption are presented. Two scenarios of the process are considered: (i) initiated by the major disruption, the latter being the main source of impurity, and (ii) minor disruption or Locked Mode (LM) provide preliminary impurity penetration into the periphery followed by deep internal disruption. Well-known ``vacuum bubble'' capture model is proposed for the explanation of rapid impurity penetration.

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