Transverse-longitudinal correlations in electron guns

When a modulated beam is produced in a DC electron gun, the time-dependent space charge force and the time-independent focusing force produce a correlation between current, position along the beam, and the beam’s radius and divergence. This has implications for beam extraction and downstream beam tr...

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Bibliographic Details
Published in:Journal of applied physics 2012-07, Vol.112 (2)
Main Authors: Harris, J. R., Lewellen, J. W., Poole, B. R.
Format: Article
Language:English
Subjects:
Beams (radiation)
Correlation
Direct current
Divergence
Extraction
Focusing
Simulation
Transport
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Summary:When a modulated beam is produced in a DC electron gun, the time-dependent space charge force and the time-independent focusing force produce a correlation between current, position along the beam, and the beam’s radius and divergence. This has implications for beam extraction and downstream beam transport. Here, we simulate an electrostatically-focused DC electron gun to study this correlation. Beam radius and divergence at the anode are found to be approximately linear functions of beam current, and the consequences for beam loss and extraction are considered.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4739296