Summary of Parameters Characterizing the HERA-B Vertex Detector System


Angular coverage [mrad]   		  h: 10 to 160 	
					  v: 10 to 250

Number of superlayers        		  7 + 1

Views in one superlayer   		  4:  0° ▒ 2.5° 
					     90° ▒ 2.5° 

Detector modules per superlayer           4 x 2 
Double-sided detectors per module	  1

Minimum detector distance to beam [mm]	  10
Annual fluence of minimum ionizing
particles at minimum distance [1/cm^2] 	  3x10^14 

Sensitive detector area     [mm^2]	  50 x 70
Typical detector thickness  [Ám]          280        
Typical diode/readout pitch [Ám]	  25 / 50
Operational temperature     [°C]         <10

Readout chips (128 ch) per module side	   8 on p-side
					  10 on n-side
Total number of
  detector modules			       64
  double-sided detectors                       64
  readout channels                        147,456
  analog optical links                        576