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--- phase2:layout [2015/01/26 14:35] – created ngadiuba
+++ phase2:layout [2015/01/26 17:26] – dsalerno
@@ Line 6: / Line 6: @@
     innerRadius 29
     outerRadius 161
-    width 22   <------------ this is the module length along z
+    width 22   <------------ this is the module length along x (local x)
-    length 71 <-------------- this is the module length along x
+    length 71 <-------------- this is the module length along z (local y)
     .....
+    }
+One module is always located centrally so that the number of modules in a rod is always an odd number. For example, numModules 3 will result in 7 modules per rod.
+You can actually change the length of a layer (including innermost and outermost layers) by specifying the number of modules to use/rod for this layer:
+  Barrel PXB {
+    numLayers 4
+    numModules 4
+    innerRadius 29
+    outerRadius 161
+    width 22
+    length 71
+    ...
+  Layer 1 {
+      radiusMode fixed
+      placeRadiusHint 29
+      numModules 3
+    }
+    ...
     }
+Here are some numbers after making the following changes:
+  * extend layer 1 and 2 by one module
+  * bring layer 2 closer to beam pipe (58 mm)
+  * move layer 3 and 4 out (120 mm, 180 mm)
+  * replace disc 1 (of 2 rings) with 3 discs of 1 ring each (at 265 mm, 285 mm, and 335 mm)
+{{:phase2:screen_shot_2015-01-26_at_17.19.10.png?nolink|}}
+GeV	layout 02						TDR
+		C	I	F	VF	WF			C	I	F	VF	WF
+  pT	1.84731	2.88889	3.91328	3.84539	11769598		2.34579	3.62749	3.65583	3.90297	11769598
+  d	0.00608	0.0077	0.01112	0.0151	39535.403		0.00625	0.00816	0.0112	0.01446	39535.4027
+  phi	0.00209	0.00292	0.00412	0.00534	10849.57674		0.00224	0.00321	0.00415	0.00482	10849.5765
+  z0	0.00748	0.01362	0.03911	0.11751	0.25247		        0.00723	0.01342	0.03911	0.11134	0.24704

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