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Heat Flux Probe: Measures
heat transfer to a surface in a plasma flow
The heat flux probe is used to measure heat
transfer to an exposed surface in a plasma flow. The probe is grounded below plasma potential which allows
electron heat flux to be ignored. This
along with several other simplifications results in the total heat flux to be
comprised of the ion convective heat flux and the radiant heat flux. The
probe consists of a water-cooled housing containing two identical heat flux
transducers. One transducer is exposed directly to the plasma to provide
total heat flux. The second is
covered by a sapphire window, which shields the transducer from convective heat
flux while measuring only the radiant heat flux.
By subtracting these values, one can estimate the net ion convective
heating. The net convective heating
in combination with values of the first and third moments of the ion velocity
distribution (determined from other probe measurements) gives the ion density.
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King,
L. B., Gallimore, A. D., and Marrese, C. M., "Transport
Property Measurements in the Plume of an SPT-100 Hall Thruster,"
Journal
of Propulsion and Power, Vol. 14, No. 3, May-June 1998, 327- 335.
- King,
L. B., "Transport-property
and Mass Spectral Measurements in the Plasma Exhaust Plume of a Hall-effect
Space Propulsion System," Ph.D.
Dissertation, University of Michigan, 1998.
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