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2016-03-21 Physics and Processing Requirements for IPAC¶
Thinking about the "measurement of emittance evolution" paper
Measurement Uncertainty | Mitigation/Estimation Strategy |
Detector Resolution | MC of "best guess" lattice |
Track extrapolation | |
Efficiency | MC of "best guess" lattice |
Track extrapolation | |
Tracker field magnitude | Hall probes give magnitude of uncertainty |
Dead reckoning with COMSOL gives magnitude of uncertainty | |
MC with wrong current field gives magnitude of measurement error | |
Detector and SS alignment | Track extrapolation/residuals gives magnitude of uncertainty |
Survey probably doesn't help for SS and tracker | |
MC with misalignment gives magnitude of measurement error | |
Selection Biases | Move selections around; examine change in measurement |
Model Uncertainty | Mitigation/Estimation Strategy |
Magnet Alignments | Track extrapolation/residuals gives magnitude of uncertainty |
Survey may help for FC | |
MC with wrong current field/misalignments gives magnitude of MC uncertainty | |
Material Budget | LiH MICE note tells us material budget and uncertainty |
Thumb in air tells us He and window budget and uncertainty | |
MC with wrong material budget gives magnitude of MC uncertainty |
Require:
- "Best guess" lattice and MC thereof
- Final version of MAUS Tracker recon/etc
- For each parameter, we might need, say, 4 MC jobs (small and large negative and positive offsets). Parameters are:
- Current of each of 10 coils
- Alignment of each of 3 modules - assume coil-by-coil alignment is okay; 3 position offsets and 2 tilts
- Alignment of each of TKU and TKD - 3 position offsets and 2 tilts
- LiH thickness
- 2 Window thicknesses
- MC should be supported with appropriate back-of-envelope calculation. Fall back to back-of-the-envelope where possible...
Would like 100k muons inside analysis cuts for each MC job.
Other things I ignore:- Apertures/uncertainty
- Anything else?
Updated by Rogers, Chris over 6 years ago ยท 6 revisions