Differences

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--- phase2:modules [2015/01/27 16:54] – dsalerno
+++ phase2:modules [2015/01/28 09:56] – dsalerno
@@ Line 1: / Line 1: @@
 ====== 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 {
@@ Line 28: / Line 28: @@
 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.

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