Fiber trigger counter

We have this 64-anode PMT ( Hamamatsu H10966A-100).

The sensitive area of the maps sensors is 15×30mm. We can make a position-sensitive trigger with our 1mm wls fiber:

This is a frame that holds 15 1mm fibers in the horizontal direction and 30 1mm fibers in a vertical orientation. The holes are for 4-40 screws.

 


fiber_trigger_base_block.stl
fiber_trigger_big_block.stl
fiber_trigger_small_block.stl

We'll bring the fibers to the PMT face. We'll need a holder for that.
0102
030405060708
091011121314
1516171819202122
2324252627282930
010203040506
070809101112
131415
These are the pieces that hold the PMT, and position the fibers:
(A) fits around the back of the pc board.
(B) holds the 8×8 fibers.
(C) holds everything together and can be screwed base plate


pmt_board_holder.stl
pmt_fiber_holder.stl
pmt_joiner.stl
This is the trigger array. I used some green wls fiber here while we obtain scintillating fiber.
Test the assembly procedure
A simple mount slides into a light-tight enclosure. The white rectangle corresponds to the location of the sensitice area.
Version2, with scontillating fibers. This version has 2 extra fibers on each end, so 15+4 fibers horizontally and 30+4 fibers vertically. The little paper holder holds 4 spare fibers.

Fiber layout, looking from the PMT to the fiber block. (1,1) is bottom left, as indicated in red. 


  -- sp 34 33 32 31 sp --   
  sp 30 29 28 27 26 25 sp
  24 23 22 21 20 19 18 17
  16 15 14 13 12 11 10 09
  08 07 06 05 04 03 02 01
  19 18 17 16 15 14 13 12
  11 10 09 08 07 06 05 xx
  -- -- 04 03 02 01 -- --

The fibers are glued into the block, then sanded and polished.
  1. Shining a light on the horizontal fibers
  2. On the vertical fibers
  3. All, after mounting
Patch panel mount
Hubert van Hecke
Last modified: Tue Nov 14 10:56:05 MST 2017