Tagger Microscope

View of the tagger microscope from under the electron beam plane, with chamber walls removed

          Main page: Tagger Microscope Contruction (UConn Wiki)

The Tagger Microscope is a movable, high-resolution hodoscope that counts post- bremsstrahlung electrons corresponding to the photon energy band of interest to the experiment in Hall D. While designed as a general-use device, it has been optimized primarily for use in the GlueX experiment, covering the E_γ range of 8.4-9 GeV (E_e 3-3.6 GeV)

The design of the Tagger Microscope calls for the spectrally-analyzed electron focal plane to be instrumented with a detector array of scintillating fibers with axes oriented toward the oncoming electrons. This is done to maintain fine focal plane segmentation in two dimensions:

• fine segmentation along the direction of electrons spread mitigates the rate and increases the energy resolution
• segmentation in the y-directions allows selective readout to match the photon collimator acceptance.

To avoid placing photo-sensors along the path of the electronics, the scintillation light will be delivered to separately-mounted sensors and electronics via clear fiber waveguides.

Rendering of the silicon photomultiplier-based scintillating fiber readout electronics.