Shower Maximum Detector for STAR FPD Upgrade

The shower maximum detector (SMD) accurately measures both deposited energy and the transverse profile of the electromagnetic shower.  These measurements are critical to identifying high-energy particles decaying to photons.  A typical event from the prototype FPD used during RHIC run 2 is shown here.

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The shower maximum detector is assembled from extruded triangular scintillator strips with a co-extruded hole for insertion of a wave-length shifting optical fiber, used for light collection.  A test set up of the SMD for the FPD is shown below.

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Mounting sketches... Multi-anode photomultiplier tubes

Last Update:  18 October 2002