Recent ECRH results in ASDEX Upgrade

This paper provides an overview on recent experimental results obtained in ASDEX Upgrade using electron cyclotron heating and current drive. The following topics are covered: determination of the power deposition profile, modulated power deposition, studies of the electron heat transport via power balance and heat wave analysis and a comparison with turbulent transport theory, generation of an internal transport barrier for the electron heat flux, impact of electron cyclotron resonance heating (ECRH) on particle and impurity transport, and studies related to neoclassical tearing modes and to sawteeth.

[1]  R. Neu,et al.  Z dependence of the core impurity transport in ASDEX Upgrade H mode discharges , 1999 .

[2]  Rohde,et al.  The tungsten divertor experiment at ASDEX upgrade , 1996 .

[3]  J. Stober,et al.  Experimental evidence for gradient length-driven electron transport in tokamaks. , 2001, Physical review letters.

[4]  G. Gantenbein,et al.  The physics of neoclassical tearing modes and their stabilization by ECCD in ASDEX Upgrade , 2001 .

[5]  P. Buratti,et al.  Gradient length driven electron heat transport study in modulated electron cyclotron heating FTU tokamak , 2002 .

[6]  N. L. Cardozo,et al.  Perturbative transport studies in fusion plasmas , 1995 .

[7]  T. Osborne,et al.  Energy transport during off-axis neutral beam heating in the DIII-D tokamak , 1998 .

[8]  Petty,et al.  Inward energy transport in tokamak plasmas. , 1992, Physical review letters.

[9]  O. Sauter,et al.  Control of neoclassical tearing modes by sawtooth control. , 2002, Physical review letters.

[10]  G. V. Pereverzev,et al.  TORBEAM, a beam tracing code for electron-cyclotron waves in tokamak plasmas , 2001 .

[11]  D. Van Eester,et al.  Re-evaluation of ITER ion cyclotron operating scenarios , 2002 .

[12]  H. Zohm,et al.  Identification of plasma-edge-related operational regime boundaries and the effect of edge instability on confinement in ASDEX Upgrade , 1997 .

[13]  F. Imbeaux,et al.  Modelling of ECH Modulation Experiments in ASDEX Upgrade with an Empirical Critical Temperature Gradient Length Transport Model , 2001 .

[14]  W. Treutterer,et al.  Optimization of confinement, stability and power exhaust of the ELMy H-mode in ASDEX Upgrade , 2001 .

[15]  H. Zohm,et al.  Behaviour of density profiles of H-mode discharges in ASDEX Upgrade , 2002 .

[16]  R. Neu,et al.  New results from the tungsten programme at ASDEX Upgrade , 2003 .

[17]  P. Mantica,et al.  Determination of diffusive and nondiffusive transport in modulation experiments in plasmas , 1991 .

[18]  Wagner,et al.  Experimental study of the principles governing tokamak transport. , 1986, Physical review letters.

[19]  T. C. Luce,et al.  Inward transport of energy during off-axis heating on the DIII-D tokamak , 1994 .

[20]  J. Stober,et al.  Dependence of the density shape on the heat flux profile in ASDEX Upgrade high density H modes , 2001 .

[21]  Manfred Thumm,et al.  Frequency step-tunable (114–170 GHz) megawatt gyrotrons for plasma physics applications , 2001 .

[22]  Julien Fuchs,et al.  Impurity behaviour in the ASDEX Upgrade divertor tokamak with large area tungsten walls , 2002 .

[23]  K. Kajiwara,et al.  Complete stabilization of a tearing mode in steady state high-βp H-mode discharges by the first harmonic electron cyclotron heating/current drive on JT-60U , 2000 .

[24]  J. P. Christiansen,et al.  Performance Near Operational Boundaries , 1999 .

[25]  F. Leuterer,et al.  Experimental characterization of the electron heat transport in low-density ASDEX upgrade plasmas. , 2001, Physical review letters.

[26]  J. Weiland,et al.  Simulation of toroidal drift mode turbulence driven by temperature gradients and electron trapping , 1990 .

[27]  F. Ryter,et al.  Theory-based modelling of ASDEX Upgrade discharges with ECH modulation , 2002 .

[28]  F. Leuterer,et al.  Modulated ECRH power deposition in ASDEX Upgrade , 2003 .

[29]  F. Leuterer,et al.  Electron heat transport in ASDEX Upgrade: experiment and modelling , 2003 .

[30]  F. Hinton,et al.  Theory of plasma transport in toroidal confinement systems , 1976 .

[31]  W. Treutterer,et al.  Performance, heating and current drive scenarios of ASDEX Upgrade advanced tokamak discharges , 2001 .

[32]  Gunter,et al.  Complete suppression of neoclassical tearing modes with current drive at the electron-cyclotron-resonance frequency in ASDEX upgrade tokamak , 2000, Physical review letters.

[33]  Experimental studies of electron transport , 2001 .

[34]  M. Zarnstorff,et al.  Electron temperature profile behaviour in TFTR during neutral beam injection and multiple pellet fuelling , 1989 .

[35]  A. Ware,et al.  Pinch Effect for Trapped Particles in a Tokamak , 1970 .

[36]  Gunter,et al.  Simultaneous attainment of high electron and ion temperatures in discharges with internal transport barriers in ASDEX upgrade , 2000, Physical review letters.

[37]  W. Suttrop,et al.  ECRH power disposition studies in ASDEX Upgrade , 2002 .

[38]  T. Franke,et al.  Plans for a new ECRH system at ASDEX upgrade , 2003 .