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Mineral Oil Tests for the MiniBooNE Detector

Mineral Oil Tests for the MiniBooNE Detector. Jennifer L. Raaf University of Cincinnati November 8, 2001. Overview of MiniBooNE Experiment Detector Event Signatures Attenuation Tests Cincinnati Tester Alabama Tester Index of Refraction Measurements Fluorescence Test

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Mineral Oil Tests for the MiniBooNE Detector

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  1. Mineral Oil Tests for the MiniBooNE Detector Jennifer L. Raaf University of Cincinnati November 8, 2001 • Overview of MiniBooNE Experiment • Detector • Event Signatures • Attenuation Tests • Cincinnati Tester • Alabama Tester • Index of Refraction Measurements • Fluorescence Test • Other Oil Tests • Summary

  2. I. Stancu University of Alabama, Tuscaloosa, AL 35487 The MiniBooNE Collaboration S. Koutsoliotas Bucknell University, Lewisburg, PA 17837 E. Church, G. J. VanDalen University of California, Riverside, CA 92521 E. Hawker, R. A. Johnson, J. L. Raaf, N. Suwonjandee University of Cincinnati, Cincinnati, OH 45221 E. D. Zimmerman University of Colorado, Boulder, CO 80309 L. Bugel, J. M. Conrad, J. Formaggio, J. M. Link, J. Monroe, M. H. Shaevitz, M. Sorel, G. P. Zeller Columbia University, Nevis Labs, Irvington, NY 10533 D. Smith Embry Riddle Aeronautical University, Prescott, AZ 86301 C. Bhat, S. J. Brice, B. C. Brown, B. T. Fleming, R. Ford, F. G. Garcia, P. Kasper, T. Kobilarcik, I. Kourbanis, A. Malensek, W. Marsh, P. Martin, F. Mills, C. Moore, E. Prebys, A. Russell, P. Spentzouris, R. Stefanski, T. Williams Fermi National Accelerator Laboratory, Batavia, IL 60510 P. J. Nienaber College of the Holy Cross, Worcester, MA 01610 D. C. Cox, A. Green, H.-O. Meyer, R. Tayloe Indiana University, Bloomington, IN 47405 G. T. Garvey, W. C. Louis, G. B. Mills, V. Sandberg, B. Sapp, R. Schirato, R. Van de Water, D. H. White Los Alamos National Laboratory, Los Alamos, NM 87545 R. Imlay, A. Malik, W. Metcalf, M. Sung, M. O. Wascko Louisiana State University, Baton Rouge, LA 70803 J. Cao, B. P. Roe University of Michigan, Ann Arbor, MI 48109 A. O. Bazarko, P. D. Meyers, R. B. Patterson, F. C. Shoemaker Princeton University, Princeton, NJ 08544

  3. Mini Booster Neutrino Experiment The MiniBooNE Detector • Two stage experiment currently under construction at Fermilab • Designed to search for neutrino oscillations • Oil Čerenkov detector • 12 m diameter carbon steel sphere • 250,000 gallons of mineral oil • 1280 photomultiplier tubes (PMTs) detect scintillation and Čerenkov light J. L. Raaf, IEEE NSS Conference, November 8, 2001 3

  4. MiniBooNE Event Signatures Čerenkov light: prompt and forming rings Scintillation light: late and isotropically distributed J. L. Raaf, IEEE NSS Conference, November 8, 2001 4

  5. Why Mineral Oil? • No expensive filtration system needed as with water detectors • Density provides more targets for neutrino interactions Several important tests were performed to aid in the decision of which oil to use • Attenuation length • Density • Index of refraction and dispersion • Fluorescence J. L. Raaf, IEEE NSS Conference, November 8, 2001 5

  6. Cincinnati Attenuation Tester Test PMT Light transmitted through oil = Reference light at that wavelength Reference PMT Reference PMT (EMI 9813) Monochromator Test PMT (EMI 9813) Oil sample Deuterium light source • Data taken are the ratio of • Test range is 3000-5000 Å in steps of 10 Å • ~ 90% of the light travels through oil sample • ~ 10% light travels to reference PMT • Setup provides relativeattenuation length of different oils and shapeof transmission curve J. L. Raaf, IEEE NSS Conference, November 8, 2001 6

  7. Cincinnati Tester Results Reproducibility of runs • Ten oils tested • very different • shapes • very different • absorption • features J. L. Raaf, IEEE NSS Conference, November 8, 2001 7

  8. Alabama Attenuation Tester • Attenuation length determined by • measuring intensity of blue light • as a function of path length in oil • Goal: measure attenuation lengths • as large as 20 m with an error better • than ±2.5 m. • Since this tester has only a • 1 m path length, must measure • light intensity with an accuracy • of better than 1%. Blue LED 460 nm Collimator Lens Lexan Fluid Level Indicator Stainless steel pipe WALL Valve Beaker XP2264B PMT J. L. Raaf, IEEE NSS Conference, November 8, 2001 8

  9. Alabama Tester Results J. L. Raaf, IEEE NSS Conference, November 8, 2001 9

  10. Index of Refraction Measurements • Container rotated on table until • minimum deflection observed • Index of refraction measured • for six lines of the mercury • spectrum Mercury line source Spectrometer table Equilateral Plexiglas container • Indices of refraction are fit to a “one resonance” model • for dense media J. L. Raaf, IEEE NSS Conference, November 8, 2001 10

  11. Density and Index of Refraction • Density and index of refraction directly • related J. L. Raaf, IEEE NSS Conference, November 8, 2001 11

  12. Fluorescence Test • Fluorescence tests performed on 3 cm3 • volume sample of oil to check for unusual • features • All oils tested were “normal” J. L. Raaf, IEEE NSS Conference, November 8, 2001 12

  13. Other Oil Tests • Two different scintillation tests in progress • Needed to understand inherent • scintillation properties of chosen oil • May add organic scintillator to chosen • oil at a later date • Allows for controlled amount of scintillation light • Ensures known value of scintillation timing for use in event reconstruction J. L. Raaf, IEEE NSS Conference, November 8, 2001 13

  14. Summary • Several factors played into the decision • of an oil for the detector • Attenuation length • Index of refraction and density • Fluorescence • Need to understand other properties of • the chosen oil • Scintillation • Important to understand the properties • of the chosen mineral oil very well to • aid in event reconstruction J. L. Raaf, IEEE NSS Conference, November 8, 2001 14

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