Abstract
Where the plasma potential is fluctuating significantly, Single Langmuir probe method is not relevant to determine the plasma characteristics. This weakness was overcome by the development of the floating double probe. A distortion of the probe characteristics due to varying potential is eliminated, while the whole probe system is floating. This supports probe operation also in discharges with strongly varying potential. Double Langmuir probes provide valuable information on the behavior of space plasmas including ionospheres and the interstellar medium. This research paper focuses on the study of Spherical Double Langmuir Probe I-V characteristics in Maxwellian interstellar plasma. To generate the exact plasma conditions of the experimental testing environments computational procedures is adopted. The investigations address the development of a technique to model Maxwellian plasma. Three different ionospheric plasma temperatures are theoretically taken and its effects on floating potential are studied in this research. The variation of floating potential and ion saturation current due to temperature is clearly depicted. A noticeable trail in the I-V curves is the bump that occurs right after the floating potential. This feature in the transition region affects ability to determine the electron temperature, ion saturation current and plasma potential. Symmetric characteristic when both tips are of equal geometry is an important advantage of the double probe. Generally, all surfaces adjacent to the plasma become contaminated with deposits, so also does any probe. Here I have also deliver some sense of how one might proceed to use these results in the analysis of experimental I-V curves acquired in space.
Highlights
Irvin Langmuir was the first who measured the voltampere characteristics by inserting a single conducting wire into plasma and using it, he determined the electron temperature and plasma density (Laframboise, 1973)
Unless the probe area is sufficient small, it may draw large electronic current by disturbing the discharge conditions when operated close to the space potential which shows that the single probe method is not suitable for decaying plasmas accompanied by the perturbation of the discharge plasmas
In order to overcome these difficulties introduced by the SLP method, the double and triple Langmuir probe methods are settled, which have negligible influence on the discharges and yield an accurate data for the measurement of plasma parameters in all types of discharge plasmas (Peterson and Talbot, 1970)
Summary
Irvin Langmuir was the first who measured the voltampere characteristics by inserting a single conducting wire into plasma and using it, he determined the electron temperature and plasma density (Laframboise, 1973). This equations shows that the relationship between electron current and electron saturation current with plasma temperatures and applied voltage (Demchenko et al, 1974).
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More From: American Journal of Engineering and Applied Sciences
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