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phase2:modules

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phase2:modules [2015/01/27 16:40] – created dsalernophase2:modules [2015/01/28 09:58] (current) – dsalerno
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 ====== Titled modules ====== ====== Titled modules ======
  
-We can tilt the pixel barrel modules by specifying the coordinates of each module. The syntax is as follows:+We can tilt the pixel barrel modules around their transverse axis by specifying the coordinates of each module. The syntax is as follows:
  
   Barrel PXB {   Barrel PXB {
     numLayers 4     numLayers 4
     //numModules 4     //numModules 4
-    maxZ 260                    <--- need to specify maxZ if using titled modules+    maxZ 205                    <--- need to specify maxZ if using titled modules
     innerRadius 29     innerRadius 29
     outerRadius 161     outerRadius 161
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   }   }
  
-The csv file of module coordinates must have 7 columns and as many rows as modules in a rod. Each row has the coordinates of a double module, with columns Ycoord[mm] Xcoord[mm] Rotation[deg] Ycoord[mm] Xcoord[mm] Rotation[deg] Nrods. It looks like this:+Note: maxZ needs to be less than the Zcoord of the last module in the csv file. 
 +The csv file of module coordinates must have 7 columns and as many rows as modules in a rod. Each row has the coordinates of an inner and outer module of a layer, with columns Ycoord[mm] Zcoord[mm] Rotation[deg] Ycoord[mm] Zcoord[mm] Rotation[deg] Nrods. It looks like this:
  
   68 0   0  70 0   0  24   68 0   0  70 0   0  24
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   68 210 30 70 210 30 24   68 210 30 70 210 30 24
  
 +{{:phase2:screen_shot_2015-01-28_at_09.52.35.png?direct&300|}}
 +
 +End cap modules cannot be tilted around their transverse axis. This is an excerpt from the tkLayout paper:
 +
 +    Modules can be rotated around their longitudinal axis by a skew angle α. This effectively
 +  increases the resolution seen by tracks by a factor cos(α), but, on the other hand, reduces the
 +  φ-aperture by the same amount.
 +    tkLayout also supports rotating barrel modules around their transverse axis by a tilt angle β,
 +  in a layout called “tilted barrel” (see figure 6), where barrel modules are increasingly tilted the
 +  further they are on the z axis (up to β = π/2 when they effectively become endcap modules). The
 +  advantage of the tilted layout is that the modules’ aperture in θ (the angle relative to the beam
 +  axis) is increased, so the number of modules to cover the same volume is reduced, to the benefit of
 +  material amount and cost.
phase2/modules.1422373254.txt.gz · Last modified: by dsalerno

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