Difference between revisions of "Coordinate Detector"

From Hall A Wiki
Jump to: navigation, search
Line 2: Line 2:
 
*[https://hallaweb.jlab.org/wiki/images/8/80/Ejensen_corrdet_report.pdf Report] by E. Jensen on the rates in the coordinate detector.
 
*[https://hallaweb.jlab.org/wiki/images/8/80/Ejensen_corrdet_report.pdf Report] by E. Jensen on the rates in the coordinate detector.
 
* Study of resolution by Mark Jones
 
* Study of resolution by Mark Jones
−
**Point target with 4.6 GeV electrons. Front face of calorimeter is 526cm from target.
+
**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.
 
**3 planes of scintillator planes with 0.5cm thickness, 134cm long and 3cm width.
−
**each plane is 268 bars iwth the middle plane offset by .25cm
+
**each plane is 268 bars with the middle plane offset by .25cm
−
**No 15cm absober block in front. (need to add).
+
**15cm absober block in front.  
−
** Throw electron for vertical and horizontal angle of +/-0.1 radians. (Needs to be larger to cover detector)
+
** 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.
−
***[https://hallaweb.jlab.org/wiki/images/9/94/Cdet_Nbar.gif Plot ] of number of bars hit with 3 MeV threshold.
+
***[https://hallaweb.jlab.org/wiki/images/9/94/Cdet_Nbar.gif Plot ] of number of bars hit with 4 MeV threshold.
 
***[https://hallaweb.jlab.org/wiki/images/6/66/Cdet_Sigma.gif Plot] of Measured minus predicted vertical position.
 
***[https://hallaweb.jlab.org/wiki/images/6/66/Cdet_Sigma.gif Plot] of Measured minus predicted vertical position.
 +
**
 +
{|
 +
|+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
 +
|}

Revision as of 17:42, 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 absober block in front.
    • Throw electron for vertical and horizontal angle of +/-0.12 radians.
      • Plot of energy loss.
      • Plot of number of bars hit with 4 MeV threshold.
      • Plot of Measured minus predicted vertical position.
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
Retrieved from "https://hallaweb.jlab.org/wiki/index.php?title=Coordinate_Detector&oldid=15754"