Accession Number:

AD1089572

Title:

The Challenges of Low-Energy Secondary Electron Emission Measurement

Descriptive Note:

Technical Report,01 Sep 2017,25 Nov 2019

Corporate Author:

AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH WRIGHT-PATTERSON AFB United States

Personal Author(s):

Report Date:

2019-11-25

Pagination or Media Count:

265.0

Abstract:

The phenomena known as secondary electron emission was discovered over a century ago. Yet it remains very difficult to model accurately due to the limited availability of reliable experimental data. With the growing use of computer simulations in hardware development, the need for accurate models has increased. This research focused on determining what factors may be causing measurement discrepancies and methods for increasing the accuracy of measurements. It was found that several assumptions are commonly invoked when these measurements are performed that may not always be consistent with reality. The violation of these assumptions leads to measurement bias that is contingent upon the apparatus and the voltages used during the measurement. This research showed that secondary electron yield measurements are sensitive to changes in the apparatus geometry, the current level, and the electron gun settings. New techniques, hardware, and models were developed in order facilitate greater measurement repeatability and accuracy.

Subject Categories:

  • Electricity and Magnetism
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE