We report on the direct relationship between output power and the current carrying
capability of a squirrel-cage HTS induction/synchronous motor based on experiment. The
secondary windings are fabricated by use of so-called DI-BSCCO tapes, and the
conventional (normal conducting) stator, three-phase and four-pole, is utilized. The tests
are carried out in liquid nitrogen for two kinds of HTS windings, in which the
number of HTS rotor bars is varied. It is directly shown that the output power
is proportional to the rotor bars’ critical current at 77 K. In other words, the
torque can be enlarged by increasing the critical current of the HTS rotor bars.
We investigate both theoretically and experimentally the momentum distribution of multiply charged ions ionized by an intense multicycle laser field with a maximum intensity of ϳ͑50-70͒ PW/ cm 2 . Ions with different charge states are produced during a single laser shot due to a spatial variation of the laser intensity within the beam focus. The measurements show approximately a simple linear relation between the width of the momentum distributions and the ionization potential of the ions. Such a power law scaling appears to be universal for various rare gas atoms used ͑He, Ne, Ar͒. We analyze this ionization dynamics using a quasiclassical tunneling theory for a single active electron model assuming that the interaction between electrons is negligible in such a strong field limit. We show that for the relatively long pulses used in the present work ͑ϳ200 fs or ϳ80 cycles͒ the effect of the laser envelope plays an important role in the ionization process.
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