Abstract
A heterodyne measurement technique has been used to investigate the frequency chirp caused by a pulsed e-beam CO2 EDL amplifier operating in the unsaturated gain regime. The measurements were made on an EDL at the AVCO Everett Research Laboratory. The device had cavity dimensions (LWH) of 100 × 5 × 6 cm and used a 3:2:1 mixture of He:N2:GO2 flowing at Mach 0.2 at atmospheric pressure. Typical e-beam operation at 130 ksV and 10 mA/cm2 ionized the mixture prior to and during the 25-μsec sustainer discharge. The discharge gave energy loadings up to 240 J/liter and estimated E/N values of 1.6 × 10−16 V/cm2.
© 1981 Optical Society of America
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