Difference between revisions of "Commissioning Calibration Data"
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| p γ → p π<sup>0</sup> | | p γ → p π<sup>0</sup> | ||
| − | | | + | | style="text-align:center;" | ~180 nb ([http://arxiv.org/abs/1505.02321 ref]) |
| − | | | + | | style="text-align:center;" | ~400 nb ([http://arxiv.org/abs/1505.02321 ref]) |
|- | |- | ||
| p γ → p η ; η → γ γ | | p γ → p η ; η → γ γ | ||
| − | | | + | | style="text-align:center;" | ~30 nb ([http://arxiv.org/abs/hep-ph/0502233 ref]) |
| − | | | + | | |
|- | |- | ||
| p γ → p ρ<sup>0</sup> ; ρ<sup>0</sup> → π<sup>+</sup> π<sup>-</sup> | | p γ → p ρ<sup>0</sup> ; ρ<sup>0</sup> → π<sup>+</sup> π<sup>-</sup> | ||
Revision as of 13:34, 3 November 2015
Contents
Final States Used For Calibrations
This is a partial list of final states that can be used for calibrations. Fully reconstructed reactions give clean inputs to calibrations procedures. It would be helpful to have rate/efficiency studies for these reactions.
Assuming electron beam @ 12 GeV
| Reaction | Cross Section @ Eγ ~ 9 GeV (μb) | Cross Section @ Eγ ~ 5 GeV (μb) |
|---|---|---|
| p γ → p π0 | ~180 nb (ref) | ~400 nb (ref) |
| p γ → p η ; η → γ γ | ~30 nb (ref) | |
| p γ → p ρ0 ; ρ0 → π+ π- | 13.5 ± 0.5 (ref) | 15.9 ± 0.7 (ref) |
| p γ → p ω ; ω → γ π0 | 0.16 ± 0.02 (ref) | 0.25 ± 0.02 (ref) |
| p γ → p ω ; ω → π+ π- π0 | 1.7 ± 0.3 (ref) | 2.7 ± 0.3 (ref) |
| p γ → p φ ; φ → K+ K- | 0.27 ± 0.03 (ref) | 0.20 ± 0.04 (ref) |
| p γ → p KS + X | ||
| p γ → Λ K+ ; Λ → p π- |
Fall 2015
Calibration data needs as of Oct. 6, 2015
| Detector | Status | Data in Hand | Est. Data Needed | Est. Running Time | Notes |
|---|---|---|---|---|---|
| BCAL | More Needed | 130k pi0 | 25-50x | ~43 - 85 hr | pi0 cluster energy > 750 MeV |
| CDC | OK | 350 M cosmics | |||
| FCAL | More Needed | 125k pi0 | 10x | ~1 - 2 hr | pi0 cluster energy > 1 GeV |
| FDC | OK | 3 shifts, 10^-4 radiator, 100 nA, no field needed | |||
| PS/PSC | OK | ||||
| Start Counter | More Needed | 80 M tracks | 10x | ~4 hr | basic calibrations are good, more refinement possible |
| TAGH | OK | ||||
| TAGM | More Needed | 10 M - 50 M | 4 hr | ||
| TOF | OK | need to verify stability of calibrations with more data |
Projected running times scaled up from conditions in Run 3185. Assumes 12 GeV e- beam with 100 nA current.
Notes
- Data needed depends strongly on S/B, especially for calorimeters.
- Lowering thresholds can have a large effect, too
- SC run list: 2931, 2932, 2933, 2934
- BCAL/FCAL run list: 2931, 3185 [diamond]; 3079, 3179, 3180, 3182, 3199, 3200, 3201, 3217 [1x10-4 RL amorphous]
- Scaling factor: diamond = 8 x amorphous
- CDC/FDC will need more data to calibrate fADC125 algorithm when it's deployed.
Scaling from 6 GeV to 12 GeV
- 6 GeV settings: 5.5 GeV e- beam, 50 um diamond radiator, 5 mm collimator, E(gam) = 2 - 5.5 GeV
- 12 GeV settings: 12 GeV e- beam, 20 um diamond radiator, 3.4 mm collimator, E(gam) = 7 - 12 GeV
- rate(12 GeV) / rate(6 GeV) ~ 80% [using cobrems in bggen, incl. plastic target on nose removal in 12 GeV era].
- Geometrical factors: (12 GeV/6 GeV)
- SC - ~1x (straight section drives needs)
- BCAL - ~1x (both photons in BCAL)
- FCAL - ~8x (both photons in FCAL)
Runs
| Run | Events | Run Time (hr) | Evts/hr |
|---|---|---|---|
| 3185 | 19.9 M | 2.2 | 9.0 M |
| 2931 | 74.6 M | 7.4 | 10.1 M |
| 2932 | 0.4 M | 0.1 | 4.0 M |
| 2933 | 3.0 M | 0.7 | 4.3 M |
| 2934 | 3.6 M | 1.5 | 2.4 M |
| 3079 | 25.9 M | 7.0 | 3.7 M |
| 3179 | 14.6 M | 1.75 | 8.3 M |
| 3180 | 41.3 M | 4.8 | 8.6 M |
| 3199 | 4.4 M | 3.0 | 1.5 M |
| 3200 | 12.5 M | 9.0 | 1.4 M |
| 3201 | 5.6 M | 5.4 | 1.0 M |
| 3217 | 10.8 M | 6.3 | 1.7 M |
