h1. 2016-03-21 Physics and Processing Requirements for IPAC

Thinking about the "measurement of emittance evolution" paper

| *Measurement Bias*   | *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 Bias*    | *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?