Feb 7 2024

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From last time

  • Carlos will incorporate into the time line a potential vent and electrode swap in case of failure to HV-condition or get the beam out (by no means anticipated, but good to know how long it would take)
  • Max, Gabriel, and Alicia will complete simulations of:
    • shallow junction angle
    • tolerance bands around nominal values, especially cathode recess, to evaluate injector acceptance (see parameter table from last meeting).
    • Final checks: tilted anode, biased anode, 140 kV
  • Deadline to define Pierce angle: Today. Max, Alicia.
  • Deadline to provide Keith Harding with the chosen models (TWO Pierce angle options): Friday, February 9, 2024. Max, Gabriel.
  • February 13, 2024. Present before the B-Team meeting the strategy followed for arriving at the optimized Pierce angle. Max and Alicia.
  • Geometrical parameters downselect


Table of parameters

Parameter Unit Nominal value Fabrication uncertainty Simulation band Comments
Hole inner radius mm 6.4135 +/- 0.3? +/- 0.3 to edge of actual metal, as measured with caliper
Pierce angle ° 16 ? +/- 2
Cone/sphere junction angle ° 30 ? 30 -- 62 was 62°; smooth transition = 26.971°
Cathode recess mm 0.188 0.05 0.1 from Keith's drawing; error may be larger for old pucks
Cathode tilt ° 0 +/- 0.5 1  
Laser spot size (RMS) mm 0.5 0.1 0.2
  • Add CST/GPT comparison between +/- values here

Updates

  • Max, Gabriel, Alicia: The nominal values above give good agreement with the R28 model; the smooth transition at the junction gives minimum field enhancement at the lip and has been shown not to cause problems due to the protruding edge (Sajini's design).
  • Alicia: What phase-space parameters are desirable? (simulations done with R30-4 candidate phase spaces)

Path forward, conclusions


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