Ordinary-mode fundamental electron cyclotron resonance absorption and emission in the Princeton Large Torus Page: 4 of 15
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of Fidone, Granata, Ramponi, and Meyer' as well as the full-wave
absorption calculations of Antonsen and Manheimer.^ We then
present the experimental evidence which demonstrates that in PLT
discharges, with a sufficiently low runaway population, the
ordinary mode emission near f , when viewed from the outside of
the torus, is essentially at the blackbody level. This emission
from the cyclotron layer [f ~ f (R) where R is the major radius
of the emitting layer], resets either from an optieallv thick
emitting layer (blackbody) or the combination of an optically thin
layer with sufficient wave reflection from the vessel (multipass
Figure 1 is a schematic block diagram of the experimental
arrangement. The incident 4 mm microwave pov.'er, P , is supplied
by a klystron transmitter at a fixed frequency of 71 GHz. The
orientations of both the transmitter and the receiver horns are
such that their electric vectors, E, are parallel to B and their
axes are perpendicular to 3. The microwave power transmitted
through the PLT plasma is collected by the receiver horn and is
mixed with a fixed amount of reference signal from a local
oscillator. The resultant radio-frequency (r.f.) output is
amplified (by an amplifier of bandwidth Af * 90 MHz) and is then
detected with an rf detector. The signal from the output of the
detector, displayed on an oscilloscope is proportional to the
transmitted power, P^,. The local oscillator is swept repetitively
from 70 to 72 GHz in 10 msec. With this sweeping technique any
small frequency drifts of the transmitter relative to the local
oscillator do not affect the absorption measurements and the
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Efthimion, P.C.; Arunasalam, V. & Hosea, J.C. Ordinary-mode fundamental electron cyclotron resonance absorption and emission in the Princeton Large Torus, report, November 1, 1979; New Jersey. (digital.library.unt.edu/ark:/67531/metadc1097251/m1/4/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.