1 / 24

The Ludlum Project

The Ludlum Project. Advisors: Dr. Randal Ruchti, Dr. Dan Karmgard Mark Vigneault Teacher: Mark Kirzeder Students: Kristen Anderson Mengwen Zhang. History of Ludlum @ Notre Dame . Ongoing Ludlum Measurements Inc.

angelo
Download Presentation

The Ludlum Project

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Ludlum Project Advisors: Dr. Randal Ruchti, Dr. Dan Karmgard Mark Vigneault Teacher: Mark Kirzeder Students: Kristen Anderson Mengwen Zhang

  2. History of Ludlum @ Notre Dame • Ongoing • Ludlum Measurements Inc. • In the past, separate wave shifting and scintillating materials were used in combination with one another.

  3. Current Focus of Ludlum @ ND • Current experiments are focused on materials that are manufactured with both properties in a single fiber. • Old 3HF • New 3HF • OX-550F • 4CN-HBT

  4. Current Goals of Ludlum • The goal of the project is to find a material that can be used in new particle detectors. • Several methods have been developed in the past and are in use at FermiLab and CERN currently.

  5. Factors Tested This Summer • Brightness • How much light is transmitted along the fiber • Decay Time • How much time passes between excitation and relaxation of molecules in the fiber • Attenuation Length • How long can a fiber be before light begins to escape

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

  7. Experiment Set Upwithin a light tight box Brass plate Radioactive source Data PMT Sr 90 Fiber PMT Counter Paddles Apiazon

  8. Experiment Set Up Optical fiber Radioactive source Time- gate paddles Bronze plate

  9. Data Gathering • Two paddles are used as triggers • Brass plate shields • Radioactive source • Data is stored on an oscilloscope • 2048 data points per run - averaged • 6 or more runs per graph - averaged • Several distances from source to PMT

  10. Data Gathering

  11. Calculating Brightness • Brightness is a measure of how much light the fiber transmits • Integration yields total light • Several integrations completed

  12. Calculating Brightness Average brightness is 1021 units at 1.5 m.

  13. Calculating Decay Time • Used for comparative analysis. • 90% - 10% of curve used • A best fit exponential or semi-log plot • 2.93m magic number

  14. Calculating Decay Time

  15. Calculating Decay Time Decay time = 1 / c =18.35ns

  16. Calculating 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 1.0m, 1.5m, 2.0m, 2.5m, and 2.93m • Incomplete data set

  17. Calculating Attenuation Length Attenuation Length = 1 / c =4.96m

  18. Test – LED Attenuation • A new test • UV LED’s 395nm and 405nm • Quicker • Easier

  19. Test – LED Attenuation • Failures • Inconsistent data • Unexpected results • Success • Development of sound data analysis techniques • Improvement of experimental techniques

  20. Experimental Set Upwithin a light tight box LED Photo Diode Sr 90 Fiber Apilazon

  21. Experimental Set Up LED Photo Diode Fiber

  22. Calculating Attenuation Length Attenuation Length = 1/c = 3.00m

  23. Calculating Attenuation Length Attenuation Length = 1/c = 4.74m

  24. Conclusions • Preliminary results indicate • New 3HF is the brightest fiber • 4CN-HBT has shortest decay time • 4CN-HBT has the longest attenuation length • The nature of future experiments will dictate which fibers will be used • There may not be one perfect fiber

More Related