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The Ludlum Project

The Ludlum Project. Advisors: Dr. Dan Karmgard Dr. Randal Ruchti, Mark Vigneault Teachers: Brian Dolezal Mark Kirzeder Students: Eric Anderson Brandyn Baumbaugh Ruvi Chauhan. Current Focus of Ludlum @ ND.

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The Ludlum Project

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  1. The Ludlum Project Advisors: Dr. Dan Karmgard Dr. Randal Ruchti, Mark Vigneault Teachers: Brian Dolezal Mark Kirzeder Students: Eric Anderson Brandyn Baumbaugh Ruvi Chauhan

  2. Current Focus of Ludlum @ ND • Using LEDs to quickly and accurately determine attenuation length and fiber quality. • Determine signal characteristics based on different geometric arrangements of tiles and fibers and tile coverings.

  3. Test – Scintillation • Used to test all three factors

  4. Variables • Materials • Y-11, DSF-1, and DSB-1 • Tile Coverings • Tyvek, Tedlar, Black Felt • Geometric Arrangements • 8 different arrangements including some that included the fiber in, out of, and on top of the tile.

  5. Experiment Set Upwithin a light tight box Radioactive Source Light Guide GaAsP PMT Tile PMT Wave Shifting Fiber Scintillating Tile Counter PMTs

  6. Experiment Set Up Counter PMTs Light Guide GaAsP PMT Scintillating Tile Tile PMT

  7. Data Gathering • Triple Coincidence • Radioactive source • Data is stored on an oscilloscope • 512 data points per run - averaged • 3 runs were averaged

  8. Calculating Brightness • Brightness is a measure of how much light the fiber transmits • An average run is done to acquire 512 signals • Integration yields total light • Several integrations completed

  9. Data Analysis Average brightness is 1021 units at 1.5 m.

  10. Data Analysis

  11. Sample Brightness Data Fiber Type Arrangement Tile covering Avg. Brightness Y-11 14 Inserted Black Felt 431.1 pvs Y-11 Side Edge Tyvek Incomplete DSB-1 14 Inserted Black Felt 395.6 pvs DSB-1 Side Edge Tyvek 436.5 pvs DSF-1 14 Inserted Black Felt 366.9 pvs DSF-1 Side Edge Tyvek 395.8 pvs

  12. Sample Signal Characteristic Data - Incomplete

  13. Test – LED Attenuation • A new test • UV LED’s (370nm, 395nm, 400nm, & 405nm) • Quicker • Easier

  14. Experimental Set Upwithin a light tight box LED Photo Diode Sr 90 Fiber Apiazon

  15. Experimental Set Up LED Photo Diode Fiber

  16. Attenuation Length • Lout = Lin * exp (-x / Attenuation Length) • Attenuation length is the distance at which 1/e of the original light remains • Light out data was gathered at 0.10m, 0.25m, 0.50m, 0.75m, 1.00m, 1.25m, 1.50m, 1.75m, 2.00m, 2.25m, 2.50m, 2.75m and 2.93m

  17. 4CN-HBT f. 12 with 370 LED

  18. Collective Average 4 CN-HBT (all fibers) 370 LED

  19. Collective Average 4CN-HBT (all fibers) 370 LED

  20. 4CN-HBT (all fibers/all LEDs)

  21. Results

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