Difference between revisions of "Coordinate Detector"
From Hall A Wiki
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**3 planes of scintillator planes with 0.5cm thickness, 134cm long and 3cm width. | **3 planes of scintillator planes with 0.5cm thickness, 134cm long and 3cm width. | ||
**each plane is 268 bars with the middle plane offset by .25cm | **each plane is 268 bars with the middle plane offset by .25cm | ||
| − | **15cm | + | **15cm plastic absorber block in front. |
** Throw electron for vertical and horizontal angle of +/-0.12 radians. | ** Throw electron for vertical and horizontal angle of +/-0.12 radians. | ||
***[https://hallaweb.jlab.org/wiki/images/a/a6/Cdet_Eloss.gif Plot] of energy loss. | ***[https://hallaweb.jlab.org/wiki/images/a/a6/Cdet_Eloss.gif Plot] of energy loss. | ||
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{|class="wikitable" style="text-align: center" width="50%" | {|class="wikitable" style="text-align: center" width="50%" | ||
|- | |- | ||
| − | + | !Threshold (MeV) | |
| − | + | ! Eff | |
| − | + | ! sigma (mm) | |
|- | |- | ||
|3 | |3 | ||
Revision as of 17:49, 4 June 2012
- Report by E. Jensen on the rates in the coordinate detector.
- Study of resolution by Mark Jones
- Point target with 4.4 +/- 0.2 GeV electrons. Front face of calorimeter is 526cm from target.
- 3 planes of scintillator planes with 0.5cm thickness, 134cm long and 3cm width.
- each plane is 268 bars with the middle plane offset by .25cm
- 15cm plastic absorber block in front.
- Throw electron for vertical and horizontal angle of +/-0.12 radians.
- Tables of resolutions and efficiencies with different thresholds
| Threshold (MeV) | Eff | sigma (mm) |
|---|---|---|
| 3 | 0.90 | 1.01 |
| 4 | 0.89 | 0.98 |
| 4.5 | 0.87 | 0.95 |
| 5 | 0.84 | 0.94 |
| 5.5 | 0.75 | 1.02 |
| 6 | 0.63 | 1.06 |
