An Introduction to Space Instrumentation,
Edited by K. Oyama and C. Z. Cheng, pp. 181-192.
© TERRAPUB, 2013.

Designing a toroidal top-hat energy analyzer for low-energy electron measurement

Y. Kazama

Plasma and Space Science Center, National Cheng Kung University, Tainan, Taiwan

Abstract: This report is a brief introduction of designing an electrostatic energy analyzer by taking a toroidal top-hat energy analyzer. First, a top-hat analyzer is parameterized with four parameters: the deflection angle, the shell electrode offset, the upper collimator height and the lower collimator thickness. Then three steps of parameter surveys are made by particle trajectory tracing simulations. In the surveys, the requirements of g-factor, azimuthangle resolution and field of view are taken into accout. After the surveys, we confirm that the final design meets the requirements. In addition, UV photon suppression performance is also evaluated by photon tracintg simulations. The expected maximum photon count rate 1.59 count/sec is acceptable, compared to the MCP's background count rates. The analyzer design investigated in this report is to be taken over by a low-energy electron instrument (LEP-e) on the radiation-belt observation satellite ERG.
Key words: Space instrumentation, plasma instrument basics, low-energy electron instrument, top-hat energy analyzer.

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