Device for finding/verifying the beam plane location

• Use CLAS12 PCAL scintillators (4.5cmx2cmx1cm) with fiber readout to make a mini-hodoscope to find the beam position under the tagger.
• Hammamatsu H8711 Multi-anode PMT borrowed from Hall B for the readout from the fibers.
• The device is inside a "dark box" made of Rohacell.
• The hodoscope will be positioned under the tagger in Hall B, and the PMT output cables will go to discriminators then to a scaler module.

Sketch of the device to find/verify the beam plane under Hall B tagger.

Top view of the device to find/verify the beam plane under Hall B tagger.

Side view of the device to find/verify the beam plane under Hall B tagger.