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Title: Low-frequency, self-sustained oscillations in inductively coupled plasmas used for optical pumping

We have investigated very low frequency, on the order of one hertz, self-pulsing in alkali-metal inductively-coupled plasmas (i.e., rf-discharge lamps). This self-pulsing has the potential to significantly vary signal-to-noise ratios and (via the ac-Stark shift) resonant frequencies in optically pumped atomic clocks and magnetometers (e.g., the atomic clocks now flying on GPS and Galileo global navigation system satellites). The phenomenon arises from a nonlinear interaction between the atomic physics of radiation trapping and the plasma's electrical nature. To explain the effect, we have developed an evaporation/condensation theory (EC theory) of the self-pulsing phenomenon.
Authors:
; ; ;  [1]
  1. Physical Sciences Laboratories, The Aerospace Corporation 2310, E. El Segundo Blvd., El Segundo, California 90245 (United States)
Publication Date:
OSTI Identifier:
22308135
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALKALI METALS; ATOMIC CLOCKS; EVAPORATION; GLOBAL POSITIONING SYSTEM; INTERACTIONS; MAGNETOMETERS; NONLINEAR PROBLEMS; OPTICAL PUMPING; OSCILLATIONS; PLASMA; SATELLITES; SIGNAL-TO-NOISE RATIO; STARK EFFECT; TRAPPING