Jan 10 2024

Updates from last meeting action items

Gabriel:
Alicia:
Carlos:
- The new electrode front end can be fabricated by the machine shop in 3 days
- The machine shop can also do the polishing, it will take ~ 1 week.
- Final polishing with diamond paste still needs to be done by CIS. Carlos needs to re-learn how to do this, and train others.
- Matt gave Carlos several pieces of high quality 316L SS (crossed-forged, vacuum arc re-melt)
- Matt also explained that the shape of the R30-3 electron front end was designed by John Hansknecht to lower the gradient at the junction to the spherical electrode shell. This was done without studying the effect on gun optics. Matt does not recall why the electron from end piece was designed with a small hole diameter than the R28 Tee electrode guns.
Max:
- Assume insert-to-sphere junction angle does not affect optics much (CST+GPT work can start to ascertain cone angle) but consider modeling the effect of the mechanical uncertainties of the junction in Poisson. This is the most important aspect of the mechanical design at this point. May be computationally problematic, but we don't intuitively understand the problem well enough. Worst case, we'll choose the same junction geometry as R30-3.
- Measurement of R28 aberrations underway at UITF, large/homogeneous cathode activated and running, just need to iron out kinks in beam instrumentation

Carlos still needs to make the schedule ending with beam hand-off to ops. Carlos needs input from Injector group for this.