Automatic fast fitting of single Langmuir probe characteristics on RFX

M. Bagatin, D. Desideri, E. Marlines, G. Manduchi, G. Serianni, V. Antoni

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An array of single Langmuir probes is routinely used in the RFX reversed field pinch for time-resolved measurements of edge electron density and temperature. In order to allow an automatic analysis of the large number of current - voltage characteristics, three different methods have been developed, which consider restricted subsets of data with voltage lower than an upper cutoff value. The first one determines this limiting voltage by a neural network based technique, combined with criteria for the rejection of too noisy characteristics. In the second one a standard fitting routine is applied repeatedly to the data while varying the upper cutoff voltage. The third one consists of a numerical technique, where the best fit is obtained by minimizing a properly defined cost function. An error index is also calculated, which allows the reliability of the results to be easily estimated. The best results have been achieved using the last two methods. © 1997 American Institute of Physics.
Original languageEnglish
Pages (from-to)365 - 368
Number of pages4
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 1997
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Bagatin, M., Desideri, D., Marlines, E., Manduchi, G., Serianni, G., & Antoni, V. (1997). Automatic fast fitting of single Langmuir probe characteristics on RFX. Review of Scientific Instruments, 68(1), 365 - 368.