Mar 6 2024
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Updates
- Max, Gabriel
- Repeated lens optimization for MFX2I01 and MFX1I03 to minimize beam size at MDR1I02 and MWF1I04...
- R30 16°/30°, SW FX lenses
- recess +0.1 mm, +0 mm, and -0.1 mm compared to nominal
- produced lens settings at 0.001 pC and used them at 0.340 pC (similar to machine setup strategy)
- Comparison of R30 16°/30° lens optimization results
- qualitative shape of curves similar; doing the optimization the other way around would not change the numbers by too much
- recess affects optimal lens setpoints (unsurprisingly) but causes no unmanageable differences in beam parameters
- minor emittance increase due to space charge
- Plan B
- we decided to keep the Plan A Pierce angle but use the junction design from R30-3
- mitigate risk of field enhancement at junction at the cost of higher surface field on lip
- Gabriel's material from last time for reference: R30-4 junction angle and lip radius gradients vs junction angle
- minor effect on beam: Comparison of R30 16°/30° and 16°/60° focal lengths
- Test plan for R28 phase space measurement at CEBAF: https://tasklists.jlab.org/bslist/tasks/111123
- extends Yan's measurement with option for Twiss-parameter fit
- perfunctory attempt with R30-3 gun last summer gave excessive emittance, likely due to chromox viewer, but better than nothing?
- Alicia
- Repeated lens optimization for MFX2I01 and MFX1I03 to minimize beam size at MDR1I02 and MWF1I04...