OBSERVATION OF SIMULTANEOUS AXIAL AND TRANSVERSE CLASSICAL HEAT-TRANSPORT IN A MAGNETIZED PLASMA

The transport of heat deposited by a small low-voltage electron beam i n a strongly magnetized plasma is studied for a time interval in exces s of two thousand ion-gyro periods. Electron temperatures are observed to evolve along and across the magnetic field at the classically pred icted rates up to times approaching one thousand gyro periods. At late r times the onset of low-frequency fluctuations (below one-tenth the i on gyrofrequency) coincides with departures from classical behavior. [ S0031-9007(98)07471-7].