On the Importance of the Grid Geometry in a Retarding Potential Analyzer
Authors/Creators
- 1. Christian-Albrechts-Universität zu Kiel, Kiel, Germany
- 2. von Hoerner & Sulger GmbH, Schwetzingen, Germany
- 3. OHB System AG, Bremen, Germany
Description
In this study, a four-grid retarding potential analyzer (RPA) with drilled grids is investigated, focusing on correlations between grid orientations and resulting characteristics. An ion beam with small divergence and a narrow energy distribution directed perpendicularly to the RPA grid system is used. It is found that for certain grid configurations, particularly when grids are aligned, the characteristics deviate from the expectation of strictly monotonic behavior in plots of the collector current against the discriminator voltage. Specifically, aligning the third and the fourth grid leads to a distinct hump at voltages below the falling flank. If the second grid is also aligned with them, the hump becomes even stronger. Several models are presented to reproduce and understand these observations. Preliminary suggestions for the design of RPAs are derived based on the findings.
Files
IEPC-2024-216.pdf
Files
(1.4 MB)
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Additional details
Identifiers
- Other
- IEPC-2024-216