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.
Selected Relevant Publications
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.