Difference between revisions of "Jan 30 2024"

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==<br  />==
 
==<br  />==
  
==Table of parameters (tentative)==
 
  
{| class="wikitable" style="margin: auto;" data-mce-style="margin: auto;"
 
|-
 
!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
 
 
|15
 
|?
 
|+/- 2
 
|likely need to increase
 
|-
 
|Cone/sphere junction angle
 
 
|62
 
|?
 
|30 -- 62
 
|to be decided based on field-emission concerns; 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
 
|}
 
  
  
  
 
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Revision as of 11:49, 30 January 2024

Action items from last time

  • Carlos will develop a high-level timeline for the rest of the project.
  • Now that the simulation models are working well, Max and Gabriel will optimize
    • the Pierce angle to give R28-like optics as a baseline and
    • the junction angle to allow for a larger lip radius, and less field enhancement. Carlos does not insist on the steep angle of R30-3, it can be a smooth transition.
  • We will make two electrodes to have a spare; one can consider making two different shapes as a contingency plan. Carlos will ask Keith to join the meetings.
  • Max will consolidate the set of field maps for apples/apples comparison in Alicia's injector model. Alicia will make a comparison between the updated R28, R30-3, and R30-4 models and work toward defining an acceptance band for phase-space parameters at the match point.

Updates and discussion

  • Link to schedule Sharepoint
  • Keith Harding reports it will take him ~ 3 days to modify the existing R30-3 Pierce front-end piece and make TWO new models per Max's design. Carlos told Keith the following parameters will change from the original R30-3 drawing:
    • Hole diameter
    • Pierce angle
    • Junction angle
    • Lip radius

Conclusions, path forward

  • Deadline to define Pierce angle: Wednesday, February 7, 2024.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.
  • Enter here additional input from the meeting


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