Calibration of a rocket borne frequency analyzer
Murphree, John Sanford
Anderson, Hugh R.
Master of Science
A High Time Resolution Experiment has been designed to detect possible high frequency (.5-1 MHz) modulation of precipitating auroral electrons with energies in the range of 4-8 kev. The experiment consists of two pair of hemispherical electrostatic energy analyzers, an electron multiplier and a frequency analyzer. The calibration of the experiment is designed to obtain the output response, which consists of voltage amplitude versus frequency, in terms of the average flux, amount of modulation and frequency of modulation. Results indicate that the HTR is capable of detecting as low as 3% modulation for a count rate of 1^9 counts/sec. Also discussed is the geometric factor calibration of the multiplier-hemispheres section of the experiment. A geometric factor of 1.6 is obtained - agreeing well with the design criteria. Experimental problems in the accomplishment of the geometric factor calibration are discussed - in particular the error involved in the use of a non-monoenergetic electron flux.