In recent years we have successfully designed, built and tested several reluctance motors
with YBCO bulk material incorporated into the rotor, working at 77 K. Our last
motor type SRE150 was tested up to 200 kW. The aim of our investigations is
the construction of motors with extremely high power density and dynamics.
In comparison to conventional motor types the advantage of HTS reluctance
motors with respect to size and dynamics could be demonstrated. Some fields of
possible future applications will be described. These motors show a significant
improvement in performance using high quality HTS bulk elements in the rotor. Until
now the motor parameters have been limited by the current density which could
be obtained in the bulk material at 77 K and by the geometric dimensions of
the segments available. Therefore we expect further improvements in the case of
these materials. Since the total motor including stator and rotor is working at
low temperature we have to optimize the windings and the magnetic circuit to
these operation conditions. A new design of a 200 kW motor in order to achieve
increased power density and the theoretical results of our calculations will be shown.
First ICRF experiments on ASDEX have been performed at 67 M z , corresponding to ZECH-heating of a hydrogen plasma at Bo = ?.2T. Despite divertor operation ICRH is accompanied by a significant increase of impurity production which can drastically be reduced by means of wall carbonisation. RF power up t o 2.3 MW is routinely coupled to the plasma for pulse lengths of up to 1 sec. The rf heating is found to depend strongly on plasma preheating. In conjination with neutral beam injection the ICRF heating efficiency is even higher than the one of SI. Confinement degrades with ICRH to values in between XI-L-type and OH confinement.
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