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Moving the Tagger Microscope (view source)
Revision as of 13:30, 27 April 2021
, 13:30, 27 April 2021→Bundle Support (aka Popsicle Stick)
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==Bundle Support (aka Popsicle Stick)==
==Bundle Support (a.k.a. Popsicle Stick)==
The Tagger Microscope (TAGM) contains 17 optical fiber bundle, each consists of a 5x6 array of 30 fibers for a total of 510 fibers (5 rows, 102 columns). Figure 2 below shows the fiber array as viewed by the electrons passing through the tagger magnet focal plane. Each optical fiber consists of a 2 mm<sup>2</sup> x 2 cm BCF-20 scintillating fiber (SciFi) thermally fused to 2 mm<sup>2</sup> x 165 cm BCF-98 light guide, see Figures 3 & 4. The SciFi end of each fiber is thermally bent into an "S" shape to remove the fiber from the electrons' path soon after passing through the SciFi, see Figure 5. The fiber begins its bend out of the electrons' path after only 4.5 cm. This length provides enough material past the fused joint to minimize strain on the joint resulting from the bend and fiber mounting straps, while also reducing the material in the line-of-fire that could result in backscatter.
The Tagger Microscope (TAGM) contains 17 optical fiber bundle, each consists of a 5x6 array of 30 fibers for a total of 510 fibers (5 rows, 102 columns). Figure 2 below shows the fiber array as viewed by the electrons passing through the tagger magnet focal plane. Each optical fiber consists of a 2 mm<sup>2</sup> x 2 cm BCF-20 scintillating fiber (SciFi) thermally fused to 2 mm<sup>2</sup> x 165 cm BCF-98 light guide, see Figures 3 & 4. The SciFi end of each fiber is thermally bent into an "S" shape to remove the fiber from the electrons' path soon after passing through the SciFi, see Figure 5. The fiber begins its bend out of the electrons' path after only 4.5 cm. This length provides enough material past the fused joint to minimize strain on the joint resulting from the bend and fiber mounting straps, while also reducing the material in the line-of-fire that could result in backscatter.
===<u>Popsicle Stick Limitations</u>===
===<u>Popsicle Stick Limitations</u>===
Placing the "Pivot Point" on the focal plane and only allowing +0.5 cm towards the tagger magnet the maximum crossing angle for the current bundle support design is β<sub>max</sub> = 19.51<sup>o</sup>, while the minimum angle is β<sub>min</sub> = 4.05<sup>o</sup>. This does not account for the most forward bundle mounting strap clamp and bolts, but they are lower in Z<sub>FP</sub> than the fibers and should not extend significantly past the 0.5 cm limit even at lower β angles.
Placing the "Pivot Point" on the focal plane and only allowing +0.5 cm towards the tagger magnet the maximum crossing angle for the current bundle support design is β<sub>max</sub> = 19.51<sup>o</sup>, while the minimum angle is β<sub>min</sub> = 4.05<sup>o</sup>. This does not account for the most forward bundle mounting strap clamp and bolts, but they are lower in Z<sub>FP</sub> than the fibers and should not extend significantly past the 0.5 cm limit even at lower β angles.
==Calculating Position of Each Bundle Support Mounting Rod==
==Calculating Position of Each Bundle Support Mounting Rod==