On the interpretation of Langmuir probe data inside a spacecraft sheath

Details On the interpretation of Langmuir probe data inside a spacecraft sheath On the interpretation of Langmuir probe data inside a spacecraft sheath

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010rsci...81j5106o&link_type=abstract

Review of Scientific Instruments, Volume 81, Issue 10, pp. 105106-105106-8 (2010).

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Langmuir Probes, Plasma Sheaths, Electric And Magnetic Measurements, Plasma Sheaths

Scientific paper

If a Langmuir probe is located inside the sheath of a negatively charged spacecraft, there is a risk that the probe characteristic is modified compared to that of a free probe in the ambient plasma. We have studied this probe-in-spacecraft-sheath problem in the parameter range of a small Langmuir probe (with radius rLP<<λD) using a modified version of the orbit motion limited (OML) probe theory. We find that the ambient electron contribution Ie(ULP) to the probe characteristic is suitably analyzed in terms of three regions of applied probe potential ULP. In region I, where the probe is negatively charged (i.e., ULPU1, there is first a transition region II in applied potential, U1

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