ABSOLUTE ELECTRON DENSITY MEASUREMENTS IN TURBULENT HYPERSONIC SPHERE WAKES WITH LANGMUIR PROBES

Authors
  1. Heckman, D.
  2. Sevigny, L.
  3. Emond, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
MONITOR AGENCY
Advanced Research Projects Agency, Arlington VA (US)
Abstract
Measurements were carried out in the ballistic range facilities at DREV of the absolute electron density levels in the wakes of 2.7 inch diameter spheres flown at 14,500 feet/second in air atmospheres at 10 torr. The experimental technique involved the use of Langmuir probes, following the theoretical demonstration of feasibility of such an experiment by G.W. Sutton. Considerable attention was paid to details of the experiment, such as probe cleanliness, minimum flow disturbance and the minimization of reflected shocks. Electron density level estimates obtained with the Langmuir probes were in good agreement with electron density estimates derived from simultaneous measurements with a microwave interferometer. The behavior of the plasma potential in the wake was also determined; the plasma potential apparently attempted to maintain itself close to the potential of the most highly biased probes, but the reason for the behavior has not been established. TRUNCATED
Report Number
690/73 —
Date of publication
15 Oct 1973
Number of Pages
57
DSTKIM No
74-01836
CANDIS No
21945
Format(s):
Hardcopy;Originator's fiche received by DSIS

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