Photo-Electron
guns require Ultra-High vacuum (UHV) in order to maximize quantum
efficiency and cathode lifetime. The vacuum levels required
for the electron gun exceed the requirements of any other portion of
the CEBAF accelerator.
Extensive research has been performed within the Electron Gun Group to
produce this UHV environment. This research includes:
- Bake temperature vs. ultimate pressure studies
- Material Outgassing rate studies
- Material coating studies
- Neg materal selection and geometry studies
- Ion pump ultimate pressure studies
The Electron Gun group at Jefferson Lab also has also partnered with a
company called Eye On Science, LLC to develop an ultra-sensitive ion
pump controller that can measure ion pump currents down to the pico-amp
regime. This product has been an invaluable asset to our studies
and is now commercially available at EyeOnScience.com

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Gun Group pages are in .pdf format.
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performed on Sept. 19, 2006
Maintained by marcy@jlab.org
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