GTS meeting 7 25 16

• 1 mA semi-stable running for nearly 7 hours: [1]
  • At 300kV, with anode bias at +1500 V, and
  • Better beam focusing and centering in the viewers, rather than on the solenoids.
  • We think is the latter that made the greatest contribution to high current beam
  • Even so, we still see sudden "photocathode-anode arcing" that reduces the QE on the illuminated area, but only slightly
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• The cathode is amazingly robust!
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