# Presentation: 666449

## Linear Collider	Muon Detector

- Pre-Prototype
- 1/16th Scale Mock-up
- Overall size: 16mm x 0.57m x 1.15m
- Scintillator area: 0.52m x 1.04m

**Notes:**
This is not an operational module.

## Materials

- Bottom skin: 0.063” Aluminum sheet
- Top skin: 0.125” acrylic sheet
- Frame: 1⁄2”x 1⁄2” s.s. square tube
- Scintillator strip: 1cm x 4cm
- Fiber: 1mm Waveshifter
- Adhesive: One part polyurethane
- Protective Tubing: PVC

**Notes:**
For the 1⁄4 scale prototype:
1- Frame will be increased to 3⁄4” square tube to provide adequate  space for fiber routing along the edge. A 1⁄4” spacer will be needed to fill additional space over the scintillator area.
2- Top skin will be 0.063” aluminum.
3- Protective tubing will only be applied at exit from scintillator.

## Bond Scintillator Strips to Skin

- Bottom skin is fastened to three frame members.
- One end left open for fibers to exit.
- Single component polyurethane dispensed from a caulking gun is used to adhere strips to the skin.

**Notes:**
For the 1⁄4 scale prototype:
1- Skin will be sealed to frame with a bead of polyurethane adhesive and riveted every 10cm or so.
2- Ends of scintillator strips could be polished if desired. 
3- Ends of scintillator strips will be coated with reflective paint.
4- Entire panel could be vacuum bagged if uniform pressure is desired.

## Fibers are added

- Fiber length cut to allow 12” extra at cookie end.
- Tubing is applied to protect fiber.
- Metalized polyester tape is applied to hold fibers in place.

**Notes:**
For the 1⁄4 scale prototype:
1- Fiber will be the spliced composite of waveshifter and clear. The end of the waveshifter will be metalized.
2- Fiber composite will be tested for satisfactory transmission.
3- Splice will be protected 1⁄2” inside scintillator.
4- Tubing (about 3” in length) will be applied to protect the splice and the bend at the edge of the scintillator.
5- Optical adhesive could be applied to the fiber in the groove before taping.
6- Tape will be held back from the edge of the scintillator strip to allow an open area for the calibration ribbon.

## Read-out Cookie

- Fibers are bundled at corner of module.
- Fiber IDs allow threading to proper pixels.
- Extra length allows stress-free handling.
- Fibers are potted with epoxy and polished after cure.

**Notes:**
For the 1⁄4 scale prototype:
1- Polish can take place with a portable flycutter brought up to the module.
P3’ can do this, as well as a Michigan State homebuilt machine or a model built by Paul Mullins Mfg.
2- Cookie will have a mounting structure to allow mating with proper PMT.

## Calibration Ribbons

- One LED pulses a fiber ribbon that covers the un-taped area of multiple waveshifter fibers.

**Notes:**
For the 1⁄4 scale prototype:
1- Ribbons lengths can be specified for any desired coverage.
2- This can also be used to facilitate a quantitative quality check.

## Secure Cookie

- Fiber bundle is snaked inside module.
- Remaining frame pieces inserted.
- Bracket used to stabilize the cookie to frame.

**Notes:**
For the 1⁄4 scale prototype:
1- This area of the fiber could be loosely sheathed for protection.
2- Sealant would be used between the skin and the frame as well as the inside corners.
3- The exit point for the fibers would also be sealed.

## Finish assembly

- Route LED wires thru frame.
- Fasten top skin to frame

**Notes:**
For the 1⁄4 scale prototype:
1- The top skin will be 0.063 aluminum sheet.
2- Top skin will be sealed to the frame and riveted every 10cm or so.
3- Led wires will terminate at a bulkhead connector mounted on the frame.

## Module complete

**Notes:**
For the 1⁄4 scale prototype:
1- A light-tightness test could be performed.
2- A final test will be performed to verify correct pixel routing and transmission.
3- Problems could still be corrected at this point by cutting off the cookie, removing the top skin, replacing the offending fiber and re-potting the cookie.