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A Look Into NICADD

A Look Into NICADD. So What Is NICADD??. Northern Illinois Center for Accelerator and Detector Development www.nicadd.niu.edu

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A Look Into NICADD

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  1. A Look Into NICADD

  2. So What Is NICADD?? • Northern Illinois Center for Accelerator and Detector Development • www.nicadd.niu.edu • “NICADD personnel collaborate closely with scientists at Fermi National Accelerator Laboratory and Argonne National Laboratory.  The NICADD experimental particle physics group has been involved in the operation of particle detectors at Fermilab and in Europe and in the development of new detectors and detector technologies for future experiments. The experimental particle physics group established a detector development laboratory at NIU and also owns and operates with Fermilab a plastic scintillator extruder at Fermilab used to make particle detector components.”

  3. What is done at the NIU Campus • Research Into Plastic Scintillator Tile Design (From Hexagon Tiles For D0 To Plates For Proton Tomography) • Research With Silicon Photo Detectors • Education With Various Hardware (Oscilloscopes, Ammeters, Voltmeters, Power Sources, Microprocessor Based Specialized Hardware, Fiber Optics, Motion Control Systems, And SO MUCH MORE!!!) • Education And Application Of Radiation Safety Practices

  4. So What Is Actually Happening In The Lab ?

  5. SCIENCE!! But Let’s See How It All Is Coming Together…

  6. Current Scintillator Tile Design (26cm) x (27cm) x (~1cm) L x W x Thickness Made by Eljen Tech http://www.eljentechnology.com/ Organic Plastic Scintillator Material Perform quality control inspections upon receipt (any imperfections within the material, scratches or other damage)

  7. How Do We Collect The Light? • A “Keyhole Groove” Is Currently Being Used. • Past Investigations Have Used A Rounded Groove And A Square Groove Using Extruded Scintillators Made At NIU. • The “Rounded Groove” Was Machined Into The Material. (EXTRUDED) • The “Square Groove” Was Part Of The Molding Process. (EXTRUDED)

  8. How does the fiber stay in place? • Eljen Optical Cement • CAUTION: Make Sure There Are No Air Bubbles In The Groove When Gluing. • Caution: Use In A Well Ventilated Room. • 4:1 Mixture Of Resin To Hardener

  9. Scintillator Plates With WSF Installed • Fiber Is Fed Through The Plate. • One End Of The Fiber Is Polished And Mirrored. • The Other End Is Polished And Put To The SiPD, Or Silicon Photo Detector.

  10. Unpainted Plate ‘Light Output’ Testing • The Completed, Unpainted Plate Is Put In A Light Tight Box. • The Light Output Is Compared Against A Set Tolerance Level.

  11. Now The Plates Are Coated With Reflective Paint • Made By Eljen Tech • Past Investigations Used Over The Counter Acrylic And Enamel Paints, And TYVEK® (Yes, That Is The Stuff A House Builder Puts On Your House As A Moister Barrier)

  12. The Completed Plates • Plates Are Separated By Common Fishing Line To Eliminate “Dead Space” and “Cross Talk”. • Quality Control Is Performed To Ensure The Entire Plate Is Covered By The Eljen Coating.

  13. Painted Plate ‘Light Output’ Testing • The same test as the unpainted plate is performed for light output.

  14. CPTA 151-30 SiPD • Center of Perspective Technology and Apparatus • Metal-Resistor-Semiconductor Geiger Gain Avalanche Photo Diode • 796 pixels with a 1.28 mm diameter • Optimal operating Temperature: 22°C (71.6°F) • CPTA Website • Optimal wavelength: 600nm

  15. SiPD Quality Control • Undergraduate Researchers are performing Quality control on ALL SiPDs • 3 Batches, 600 SiPDs per Batch • ~10% failure rate in the first Batch

  16. Mounting the Fiber to the Detector • Ferrule (below) has fiber inserted into it. • Then, the detector and the Ferrule are mounted into the frame (Next Slide…)

  17. The Detector and Fiber Mounted

  18. The Plates and Detectors Mounted • The frame holds (8) plates. • The associated SiPDs and fibers (The holes on the left).

  19. CAUTION: RADIATION

  20. Dosimetry

  21. Sr-90 Source • Half Life: 28.8 years • Beta minus decay process, 0.546MeV Decay Energy

  22. Sr-90 Source continued… • Shutter system keeps source closed. • ~4mRem/hr closed • ~20mRem/hr open • 5mCi when new in April 2002 • So, what is the activity today?

  23. Storage/Safety of Sr-90 Source • Kept in a locked safe • Only certain personnel have the combination • Door to lab is locked and keys are controlled • All personnel control access to the lab when open. • Surveys are done annually by University RSO and techs • RADCON Training is completed by all faculty/students involved in research

  24. RADCON MATH • Activity Equation • At=Aoe-(ln2(t/T)) • At is the activity at time t (we will use 10 years for simplicity) • Ao is the original activity • T is the half life of the element in question

  25. And the answer is… 3.93mCi

  26. Taking Measurements • Held at one position for 9 seconds • Average 156 positions per data run • 40 min/run • Motion control and data collected in LabView • Thermocouple records temperature inside light tight box. • Dark Current Measurements are know. • Source is installed. • Measurements are taken on the outside of the plate. (~15mm away from edge) • Measurements are taken on predetermined positions on the plate.

  27. In Conclusion… • These investigations are being used for the proton tomography project at FermiLab. • The type of detectors used in the past and currently are being used at CERN and FermiLab for new discoveries… • The NICADD program has matured into a world class research opportunity. • My research results from 2002-2003 are still being used to guide the current researchers.

  28. Resources • www.nicadd.niu.edu • http://www.niptrc.org/index.html • http://www.niu.edu/nicadd/research/medical/index.shtml • CPTA Homepage • Sr-90 Wiki • General Decay Info

  29. And Special Thanks To… • Dr. Dave Hedin, NIU • Dr. Sasha Dyshkant, NICADD • Dr. DhimanChakraborty, NIU • Eric Johnson, NICADD

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