会议专题

ECRH ON ASDEX UPGRADE - SYSTEM EXTENSION,NEW MODES OF OPERATION, PLASMA PHYSICS RESULTS -

The ECRH system at ASDEX Upgrade is currently extended from 1.6 MW to 5 MW. The extension so far consists of 2-frequency units, which use single diamond-disk vacuum-windows to transmit power at the natural resonances of these disks (105 & 140 GHz). For the last unit of this extension two additional intermediate non-resonant frequencies are foreseen, requiring new window concepts. For the torus a polarisation-independent double-disk window has been developed. For the gyrotron a grooved diamond disk is actually favoured, for which the grooved surfaces act as anti-reflective coating. Since ASDEX Upgrade operates with completely W-covered plasma facing components, central ECRH is often applied to suppresses W-accumulation in the plasma center. In order to extend the operational range for central ECRH, X3- and O2-heating schemes were developed. Both are characterized by incomplete single-path absorption. For X3 heating, the X2 resonance at the pedestal on the high field side is used as a beam-dump, for the O2 scheme a specific reflector tile on the inner heat shield enforces a second path through the plasma center. The geometry for NTM control had to be modified to allow simultaneous central heating. In real-time the ECRH position can be determined either by ray-tracing based on real-time equilibria and density profiles or from ECE for modulated ECRH power. Fast real-time ECE also allows to determine the NTM position. Further major physics applications of the system are summarized.

Multi-frequency gyrotron Tokamak Tungsten Impurity control ECRH NTM stabilisation

J.STOBER M.REICH D.SCHMID-LORCH H.SCH(U)TZ J.SCHWEINZER W.TREUTTERER H.ZOHM A.MEIER TH.SCHERER J.FLAMM M.THUMM D.WAGNER H.H(O)HNLE W.KASPAREK U.STROTH A.V.CHIRKOV G.G.DENISOV A.LITVAK S.A.MALYGIN V.E.MYASNIKOV V.O.NICHIPORENKO L.G.POPOV L.GIANNONE E.A.SOLUYANOVA E.M.TAI F.LEUTERER M.MARASCHECK A.MLYNEK F.MONACO M.M(U)NICH E.POLI

Max-Planck Institut f(u)r Plasmaphysik, EURATOM-Association, Garching, Germany Karlsruhe Institute of Technology, EURATOM-Association, Karlsruhe, Germany Institut f(u)r Plasmaforschung, Universit(a)t Stuttgart, Stuttgart, Germany Institut of Applied Physics, Russian Academy of Science, Nizhny Novgorod, Russia GYCOM Ltd, Nizhny Novgorod, Russia

国际会议

The 16th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating(第十六届电子回旋放射和电子回旋共振加热会议(EC-16)

三亚

英文

28-41

2010-04-12(万方平台首次上网日期,不代表论文的发表时间)