A new technique for wall conditioning that will be especially useful for future larger
superconducting tokamaks, such as ITER, has been successfully developed and encouraging results
have been obtained. Solid carborane powder, which is non-toxic and non-explosive, was used.
Pulsed RF plasma was produced by a non-Faraday shielding RF antenna with RF power of 10 kW. The ion
temperature was about 2 keV with a toroidal magnetic field of 1.8 T and a pressure of 3 × 10-1 Pa.
Energetic ions broke up the carborane molecules, and the resulting boron ions struck and were deposited on
the first wall. In comparison with glow discharge cleaning boronization, the B/C coating film shows
higher adhesion, more uniformity and longer lifetime during plasma discharges. The plasma performance
was improved after ICRF boronization.
The Ergodic Magnetic Layer Experiment on ohmically heated Text demonstrates that a small resonant helical field (m/n = 7/2 or 7/3) with fractional amplitude b̃r/BT of about 10−3 creates a stable ergodic magnetic layer and substantially modifies the boundary heat flow. Field line tracings accurately map the observed perturbed limiter heat load patterns. The level of the intrinsic impurities is reduced, consistent with a lower edge electron temperature, as measured by the electron cyclotron emission detector.
Experimental Advanced Superconducting Tokamak (EAST) is the first fully superconducting tokamak. The first commissioning started on Feb. lSt of 2006 and finished on March 30th of 2006 at the Institute of Plasma Physics, Chinese Academy of Sciences. It consists of leakage testing at both room temperature and low temperature, pumping down, cooling down all coils, current leads, bus bar and the thermal shielding, exciting all the coils, measuring magnetic configuration and warming up the magnets. The electromagnetic, thermal hydraulic and mechanical performance of EAST Toroidal Field (TF) and Poloidal Field (PF) magnets have also been tested. A l l sub-systems, including pumping system, cryogenic system, PF& TF power supply systems, magnet instrumentation system, quench detection and protection system, water cooling system, data acquisition system, main control system, plasma control system (PCS), interlock and safety system have been successfully tested.
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