Fine-tuning the z-positions of the stations


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This shows the acceptance vs event z-position and track angle for the detector, with planes placed according to (1) the current (April 2007) Hytec z-positions, and (2) for a configuration with the last plane as far back as possible in order to get the best DCA resolution.

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The blue lines indicate accepttance for barrel layers. Tracks in the region above the line hit n (n=1-4) barrel layers. For example, a track from z=-6cm and 17.5° hits 4 endcap layers (hatched magenta area), and also 2 barrel layers.

acceptance_hytecz.kumac
acceptance_maxz.kumac
acceptance_hytecz_barrel.kumac
acceptance_maxz_barrel.kumac

acceptance for different z's
For the default configuration ('Hytec'), and for events at z=0, the acceptance ranges are as shown here:

Xfig source: acc_1D.fig
In 2012, Jin made this version of an acceptance plot:



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