A microwave plasma density measuring system with microsecond response time

Stanley G. Burns, James B. Beyer

Research output: Contribution to journalArticle


Based on the STALO (acronym for STAbilization of Local Oscillator) system wherein an external high Q cavity is used to frequency stabilize a reflex klystron, a technique was developed using a microwave Fabry-Perot resonator (MFPR) operating at 35 GHz for performing time varying plasma diagnostics over a two to three order of magnitude range centered at 5×109 electrons/cm3. Experimental results are given for 2 MHz density variations in a 125 μ He rf induced discharge. The frequency response is an order of magnitude faster than an external feedback control system (also described) which utilizes the MFPR. Calibration techniques as well as the underlying theory are also given.

Original languageEnglish (US)
Pages (from-to)33-36
Number of pages4
JournalReview of Scientific Instruments
Issue number1
StatePublished - Dec 1 1970


Cite this