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phase2:modules [2015/01/27 16:54] – dsalerno | phase2: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 |
Barrel PXB { | Barrel PXB { | ||
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Note: maxZ needs to be less than the Zcoord of the last module in the csv file. | 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 a double | + | 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 |
68 0 | 68 0 | ||
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68 210 30 70 210 30 24 | 68 210 30 70 210 30 24 | ||
+ | {{: | ||
+ | |||
+ | 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. |