Difference between revisions of "GEP software meeting agendas/minutes"
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* Central precession angle is calculated assuming a central field integral of 2.43 T*m for the maximum field setting. | * Central precession angle is calculated assuming a central field integral of 2.43 T*m for the maximum field setting. | ||
* HCAL distance of 10 meters is assumed for all settings. It may be desirable to put HCAL slightly closer for the low-Q^2 settings, but coverage of the useful acceptance seems good even for those settings. | * HCAL distance of 10 meters is assumed for all settings. It may be desirable to put HCAL slightly closer for the low-Q^2 settings, but coverage of the useful acceptance seems good even for those settings. | ||
| − | * Central kinematics (Q^2, proton momentum, scattered electron energy, etc) are calculated using the beam energy and the central SBS angle. The central ECAL angle may differ slightly for GEP-2a from the angle implied by the central proton kinematics and the beam energy. | + | * Central kinematics (Q^2, proton momentum, scattered electron energy, etc) are calculated using the beam energy and the central SBS angle. The central ECAL angle may differ slightly for GEP-2a from the angle implied by the central proton kinematics and the beam energy. Need to check acceptance matching and vacuum snout aperture on ECAL side. |
==Agendas and Minutes== | ==Agendas and Minutes== | ||
Revision as of 15:20, 13 August 2024
GEP software meetings
| Name | GEP-1 | GEP-2 | GEP-2a | GEP-3 |
|---|---|---|---|---|
| (aka GEP-0) | ||||
| Beam Energy (GeV) | 6.476 | 8.588 | 4.359 | 10.688 |
| SBS angle (deg) | 25.7 | 22.1 | 28.5 | 16.9 |
| Central/nominal Q^2 (GeV^2) | 5.732 | 8.127 | 3.860 | 12.039 |
| ECAL angle (deg) | 29.46 | 27.27 | 35.0 | 29.75 |
| ECAL distance (m) | 8.0 | 6.5 | 5.0 | 4.7 |
| SBS distance (m) | 1.6 | 1.6 | 1.6 | 1.6 |
| HCAL distance (m) | 10.0 | 10.0 | 10.0 | 10.0 |
| Central proton momentum (GeV) | 3.881 | 5.185 | 2.845 | 7.294 |
| Central electron energy | 3.422 | 4.257 | 2.302 | 4.273 |
| SBS magnetic field (% of maximum) | 53 | 71 | 39 | 100 |
| Central precession angle (deg, rough) | 43.7 | 57.7 | 32.8 | 80.5 |
| epsilon | 0.733 | 0.720 | 0.691 | 0.616 |
| P_T | -0.068 | -0.044 | -0.114 | -0.029 |
| P_L | 0.674 | 0.692 | 0.707 | 0.787 |
Notes on the kinematics table
- ECAL distance and central angle for GEP-2a are not yet finalized; need to optimize, check snout aperture, acceptance matching, etc.
- Nominal magnetic field settings are for nominal production data taking (optimizing acceptance/event rate). Some fraction of the data may be taken at other field settings to study systematics of SBS optics and spin precession. In particular, some fraction of the GEP-2a and/or GEP-1 data may be taken at the higher field settings relevant for GEP-2/GEP-3
- Central precession angle is calculated assuming a central field integral of 2.43 T*m for the maximum field setting.
- HCAL distance of 10 meters is assumed for all settings. It may be desirable to put HCAL slightly closer for the low-Q^2 settings, but coverage of the useful acceptance seems good even for those settings.
- Central kinematics (Q^2, proton momentum, scattered electron energy, etc) are calculated using the beam energy and the central SBS angle. The central ECAL angle may differ slightly for GEP-2a from the angle implied by the central proton kinematics and the beam energy. Need to check acceptance matching and vacuum snout aperture on ECAL side.
Agendas and Minutes
We are collecting meeting agendas/minutes/links to slide shows here for the time being. The meetings are currently Tuesdays, 10:30 AM. Subscribe to sbs_software@jlab.org for announcements/updates.
Tuesday, August 6, 2024 (no meeting was held)
