Self-compensated standing wave probe for characterization of radio-frequency plasmas

Ta Lun Sung, Shosaku Matsumura, Kungen Teii, Shinriki Teii

Research output: Contribution to journalArticlepeer-review


A simple self-compensated Langmuir probe using the character of a standing wave is developed for characterization of radio-frequency (RF) discharge plasmas. This probe is based on a concept that the interference of RF field is eliminated at the node of a standing wave which exists ideally at one-fourth of the RF wavelength (λ/4) away from the probe tip in the plasma. The fluctuation of plasma space potential is suppressed as confirmed by comparison with a non-compensated probe and a self-compensated probe using an inductor-capacitor (LC) resonant circuit. The plasma parameters obtained with the standing wave probe are in agreement with those with the LC resonant probe within discrepancy of 15% indicating high reliability of the results.

Original languageEnglish
Article number063507
JournalReview of Scientific Instruments
Issue number6
Publication statusPublished - Jun 2014

All Science Journal Classification (ASJC) codes

  • Instrumentation


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