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(EXP2/04) Improved Confinement, High-$\beta$ Regimes and Edge Behaviour on the COMPASS-D Tokamak with High Power ECRH and LHCD

   
A. W. Morris , S. J. Fielding , M. Valovic , P. G. Carolan , J. W. Connor , A. R. Field , B. Lloyd , C. Warrick , H. R. Wilson , the COMPASS-D Team  and the RF Team 
 
EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, UK

Abstract
COMPASS-D , due to its small size (R=0.56m, a=0.18m) and long pulse length (relative to field diffusion times), provides valuable data when establishing the underlying physics and scalings for H-mode  thresholds, confinement, and ELM behaviour for devices of the scale of ITER . It is found that the H-mode threshold has a very different parametric behaviour than that observed on larger devices, and new edge data provides a possible explanation. An adaptable 60GHz ECRH system has allowed high power ECRH (1.8MW installed power) to be used over a wide range of plasma parameters from low collisionality  high $\beta$ to high density H-modes. This system injects neither particles nor momentum, and is thus representative of the situation on ITER. A 1.3GHz 400kW LHCD system has provided additional flexibility for long pulse operation  and optimisation of high $\beta$ discharges (e.g. to avoid disruptions).

         

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