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(EXP5/29) Transition Dynamics and Confinement Scaling in COMPASS-D H-mode Plasmas

S. J. Fielding¹⁾, P. G. Carolan¹⁾, J. W. Connor¹⁾, N. J. Conway¹⁾, A. R. Field¹⁾, P. Helander¹⁾, Yu. Igitkhanov²⁾, B. Lloyd¹⁾, H. Meyer¹⁾, A. W. Morris¹⁾, O. Pogutse¹⁾, M. Valovic¹⁾, H. R. Wilson¹⁾, COMPASS-D Team¹⁾, COMPASS-ECRH Team^1)
 
1) EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, UK
²⁾ ITER Joint Central Team, Joint Work-Site, D-85748 Garching, Germany

Abstract.  This paper describes experimental analysis of different phases of ECRH H-mode discharges on COMPASS-D, from L-H transition trigger to steady state. Comprehensive high-resolution measurements of the transport barrier region have enabled significant progress to be made in assessing H-mode trigger mechanisms, as well as clarifying the evolution of the local electric field and its shear. Stationary ELMy H-modes are achieved at high $\rho^{*}_{}$ with good confinement, and dimensionless scaling over a range of $\nu^{*}_{}$ is presented.

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