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Decay Detector Description 14 vertical and 12 horizontal scintillator strips give the ΔE1 and ΔE2 signals Strips are 1 mm x 1 cm x 18 cm Signals taken in coincidence from the two strip layers give angle information (overlapping strips form 1 cm 2 pixels) Fiber optic bundles transport light response from strips to PMTs 5 scintillator blocks give the E signals Angular range of 5° to 45°

Decay Detector Description

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Page 1: Decay Detector Description

Decay Detector Description

• 14 vertical and 12 horizontal scintillator strips give the ΔE1 and ΔE2 signals

• Strips are 1 mm x 1 cm x 18 cm• Signals taken in coincidence from the two strip

layers give angle information (overlapping strips form 1 cm2 pixels)

• Fiber optic bundles transport light response from strips to PMTs

• 5 scintillator blocks give the E signals• Angular range of 5° to 45°

Page 2: Decay Detector Description

Plot of Pixel Angle Resolution vs. Pixel Median Angle 

Median Angle and Angle Resolution for Each Pixel on the ΔE1-ΔE2 Array

Page 3: Decay Detector Description

Fiber Bundle Construction: This is a schematic of the rectangular and cylindrical ends of a typical fiber bundle.

 

Making the Optical Connection between Fiber Bundle and Scintillator Strip: Two of each piece in the lower right hand corner drawing are used to make the Joint Case. A photo of the step prior to filling the Joint Case cavity with optical cement and inserting the plastic scintillator is shown in the lower left. Proper alignment of a finished optical connection is shown on top.

Fiber Bundles:1. 19 plastic fibers, 50 cm long2. Connect to 1cm diameter PMT3. Connect to 1mm x 1cm strip scintillator

end4. Rectangular and circular molds filled with

optical cement to maintain shape5. Ends ground flat, sanded and polished to

optical finish

Casing for Optical Joint between Fiber Bundle and Strip Scintillator:1. 4 pieces of Plexiglas mated to form

sleeve2. Cavity filled with optical cement, strip

scintillator inserted to make the optical connection

Light Transport from Strip Scintillator to PMT

Page 4: Decay Detector Description

Photos of Wrapped and Assembled Block Scintillators and Light Guides

Page 5: Decay Detector Description

Design for the E3 Block Light Guide: The geometry of the light guide comes from the intersection of a 2.5” tall extrusion of the scintillator shape with an eccentric cone.

GuideIt Simulation Results

 

Light transmission through the odd-shaped light guides is optimized for light guide height of 2.5”

Page 6: Decay Detector Description

Top View of the PMT ring and its Connected Components: PMTs are clamped onto holders along the outside of the ring. The fiber bundles connected to strip scintillators fit into cylindrical slots and are pressed against clear Plexiglas windows. PMTs are pressed against the opposite side of the window.

Views of the Target Chamber Lid and its Connected Components: E Blocks are fixed to the Light Guide Plate by Light Guide Flanges.

 

Installation of the Decay Detector into the Target Chamber