Difference between revisions of "Mar 6 2024"
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| − | == Updates == | + | ==Updates== |
* Max, Gabriel | * Max, Gabriel | ||
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*** Gabriel's material from last time for reference: [[media:R30-4_Junction_angle.pptx|R30-4 junction angle and lip radius gradients vs junction angle]] | *** Gabriel's material from last time for reference: [[media:R30-4_Junction_angle.pptx|R30-4 junction angle and lip radius gradients vs junction angle]] | ||
*** minor effect on beam: [[media:R30_16_30vs60.pdf|Comparison of R30 16°/30° and 16°/60° focal lengths]] | *** minor effect on beam: [[media:R30_16_30vs60.pdf|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 | + | ** Alicia |
| + | *** [[media:Comparison_R282_140kV180kVops_settings_scaled_to_200kV_R304_16degPierce30degJunction_beamline_sims_20240303.pdf|140 and 180 kV R28-2 operational settings scaled to 200 kV for R30-4]] | ||
| + | ** Yan | ||
| + | *** [[media:BeamSizeFeb2024.xlsx|Measured beam sizes at different focusing settings]] | ||
| + | ** Max: 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 | *** 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? | *** perfunctory attempt with R30-3 gun last summer gave excessive emittance, likely due to chromox viewer, but better than nothing? | ||
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Latest revision as of 07:58, 6 March 2024
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
- Alicia
- Yan
- Max: 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?
- Repeated lens optimization for MFX2I01 and MFX1I03 to minimize beam size at MDR1I02 and MWF1I04...