Coordinate Detector

• 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