Negative Transconductance in Apertured Electron Guns
Journal Article
·
· Journal of Applied Physics
OSTI ID:943841
Passing an electron beam through an aperture can serve to reduce the beam current or change the transverse beam profile. For a sufficiently intense beam, space charge will drive a radial expansion of the beam, which may cause the current passing through the aperture to increase even though the current arriving at the aperture is decreasing. When a gridded electron gun is used, this may be expressed by stating that the transconductance of the apertured gun is negative. Here we explain this effect, and explore some of the key factors governing when it can occur and influencing its strength.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 943841
- Report Number(s):
- UCRL-JRNL-234926; JAPIAU; TRN: US200902%%446
- Journal Information:
- Journal of Applied Physics, Vol. 103; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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