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The BTeV-RICH Project

The BTeV-RICH Project. Chaouki Boulahouache Sheldon Stone Tomasz Skwarnicki Marina Artuso RICH Group Syracuse University. Belarussian State- D .Drobychev, A. Lobko, A. Lopatrik, R. Zouversky UC Davis - P. Yager Univ. of Colorado- J. Cumalat, P. Rankin, K. Stenson Fermi National Lab

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The BTeV-RICH Project

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  1. The BTeV-RICH Project Chaouki Boulahouache Sheldon StoneTomasz SkwarnickiMarina ArtusoRICH Group Syracuse University Chaouki Boulahouache

  2. Belarussian State-D .Drobychev, A. Lobko, A. Lopatrik, R. Zouversky UC Davis - P. Yager Univ. of Colorado-J. Cumalat, P. Rankin, K. Stenson Fermi National Lab J. Appel, E. Barsotti, C. N. Brown , J. Butler, H. Cheung, D. Christian, S. Cihangir, I. Gaines, P. Garbincius, L. Garren, E. Gottschalk, G. Jackson, A. Hahn, P. Kasper, P. Kasper, R. Kutschke, S. Kwan, P. Lebrun, P. McBride, J. Slaughter, M. Votava, M. Wang, J. Yarba Univ. of Florida at Gainesville P. Avery University of Houston A. Daniel, K. Lau, M. Ispiryan, B. W. Mayes, V. Rodriguez, S. Subramania, G. Xu Illinois Institute of Technology R. A. Burnstein, D. M. Kaplan, L. M. Lederman, H. A. Rubin, C. White Origins: Hera/HeraB Fnal FT CLEO Massive expertise in pixels, trigger, electronics, tracking, crystal calorimetery, RICH, & Muon detection BTeV-Collaboration K. Shestermanov, L. Soloviev, A. Uzunian, A. VasilievUniversity of Iowa C. Newsom, & R. BraungerUniversity of MinnesotaJ. Hietala, Y. Kubota, B. Lang, R. Poling, & A. Smith Nanjing Univ. (China)- T. Y. Chen, D. Gao, S. Du, M. Qi, B. P. Zhang, Z. Xi Zhang, J. W. Zhao Ohio State University- K. Honscheid, & H. KaganUniv. of PennsylvaniaW. Selove Univ. of Puerto Rico A. Lopez, & W. XiongUniv. of Science & Tech. of China - G. Datao, L. Hao, Ge Jin, T. Yang, & X. Q. Yu Shandong Univ. (China)- C. F. Feng, Yu Fu, Mao He, J. Y. Li, L. Xue, N. Zhang, & X. Y. Zhang Southern Methodist Univ - T. Coan, M. Hosack SUNY Albany - M. Alam Syracuse University M. Artuso, S. Blusk, J. Butt, C. Boulahouache, O. Dorjkhaidav J. Haynes, N. Menaa, R. Mountain, N.Nadakumar, L. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang Univ. of Tennessee - T. Handler, R. MitchellVanderbilt University - W. Johns, P. Sheldon, E. Vaandering, & M. Webster Univ. of Virginia: M. Arenton, S. Conetti, B. Cox, A. Ledovskoy, H. Powell, M. Ronquest, D. Smith, B. Stephens, Z. Zhe Wayne State University G. Bonvicini, D. Cinabro, A. Shreiner University of Wisconsin M. Sheaff York University - S. Menary Univ. of Illinois- M. Haney, D. Kim, M. Selen, V. Simaitis, J. Wiss Univ. of Insubria in Como- P. Ratcliffe, M. Rovere INFN - Frascati- M. Bertani, L. Benussi, S. Bianco, M. Caponero, F. Fabbri, F. Felli, M. Giardoni, A. La Monaca, E. Pace, M. Pallotta, A. Paolozzi INFN - Milano - G. Alimonti, L. Edera, D. Lunesu, S. Magni, D. Menasce, L. Moroni, D. Pedrini, S.Sala, L. Uplegger INFN - Pavia- G. Boca, G. Cosssali, G. Liguori, F.Manfredi, M. Manghisoni, M. Marengo, L. Ratti, V. Re, M. Santini, V. Speziali, P. Torre, G. Traversi IHEP Protvino, Russia A. Derevschikov, Y. Goncharenko, V. Khodyrev, V. Kravtsov, A. Meschanin, V. Mochalov, D. Morozov, L. Nogach, Chaouki Boulahouache

  3. The BTeV Detector Co-spokespersons: Sheldon Stone, Syracuse University; Joel Butler, Fermilab An experiment at Fermilab, Batavia Il, design to study fundamental symmetries in Nature Chaouki Boulahouache

  4. The BTeV Ring Imaging CHerenkov Device C4F10 Gas Chaouki Boulahouache

  5. Cherenkov Radiation Chaouki Boulahouache

  6. Radiation Length • Because of the Calorimeter which is positioned behind the RICH, the radiation length of the mirror system have to be minimized. We prefer a 1%-2% radiation length. The RICH Mirror System • The only constraints are: • Two large mirrors, each one has 220cm (width) and 440cm (height). They can be broken down to any number of mirrors of any shape, so that cost and performance are optimized. • A half circle hole in the side (of radius 3 cm ?????). • Mean radius is fixed to 697cm. Chaouki Boulahouache

  7. Mean Radius Variation Within A Mirror And Between Neighboring Mirrors… The following results are based on the RICH simulation Spec. on the mean radius. Random variation of the mirror radii (between mirrors 17) Chaouki Boulahouache

  8. We use tracks that hit the corner A, so that photons share mirrors 1,2 and 3. Mirror #2 697cm + 1cm Mirror #3 697cm + dR cm Mirror #1 697cm Neighboring Mirror Radii Variation According To A Prescription… Nominal radius taken at the reconstruction Probable radius taken at the reconstruction In the reconstruction part we use the most probable radius, using the photon hit coordinates on the detection plane together with track direction. Mirror #2 697cm + 3cm (-3 cm) Chaouki Boulahouache

  9. Mirror #2 697cm + 4cm (-4cm) Mirror #2 697cm + 6cm (-6cm) Mirror #2 697cm + 5cm (-5cm) Mirror #2 697cm + 7cm (-7cm) • Requirement for the mean radius variation : dR<3 cm Neighboring Mirror Radii Variation (continue)… Chaouki Boulahouache

  10. Optical Quality: Smoothness And Spot Size… • Smoothness Requirement: • 1% of the shortest wavelength defined by the acrylic window which cuts off wavelengths less than 280nm. Therefore, the smoothness is required to be less than 2.8nm. • Spot Size: Definition And Simulation… • It is the diameter of the circle that contains 95% of the focused light. • The spot size can be generated in an uncorrelated way (a random variation of the reflection angle)  This can lead to wrong conclusions. • Alternative way that includes the correlations  Make use of the wavefront expansion in terms of the Zernike polynomials. Chaouki Boulahouache

  11. Convention Adopted For Zernike Polynomials Chaouki Boulahouache

  12. Variation Of The dq /per Track As A Function Of Spot Size For Different Zernike Terms…  Random ■ Z12 Astigmatismx ▲Z13  Astigmatismy Random ■ Z7 Comax ▲ Z8 Comay Random ■ Z4 Focus ▲Z9 Primary Spherical • We use the Zernike terms to simulate the aberrations. • Spot size is simulated on-axis (as we would measure it.) • Effect of the aberration has been propagated off-axis to simulate the Cherenkov angle reconstruction. • Spot size requirement < 2.5 mm Chaouki Boulahouache

  13. The glass mirror does not have this anomaly. Spot Image Using Composite Mirror Image as recorded The light outside the central spot could not be understood, but a solution was found to get rid of it. Hide some portion of the edges Chaouki Boulahouache

  14. Not much light Glass Light saturates the pixels Spot-Size Vs. Light Output Chaouki Boulahouache

  15. Y-cut 2.60mm Spot-Size Measurement (Glass) Chaouki Boulahouache

  16. Other Mirror Related Activities • First Look At The Ronchi Test For The Glass Mirror… Ronchi screen: 50 lines/inch • “For the glass mirror, the image shows clear zonal features (concentric rings), presumably associated with the grinding and polishing of the mirror. Aside from the zonal features, spherical aberration and possibly coma seem to be predominant in the glass mirror” (Robert Romeo – CMA company). Chaouki Boulahouache

  17. Other Mirror Related Activities (continue) • First Look At The Ronchi Test For The CF Mirror… Ronchi screen: 50 lines/inch • The aberrations seem to be somewhat irregular for the composite mirror with edge not clearly defined. There appears to be spherical aberration as predominant. (Robert Romeo – CMA company). Chaouki Boulahouache

  18. Support panel Pivot Block Spherical Bearing Housing Threaded Rod Plastic Prototype Nuts Spherical Bearing Mirror Mount Testing(1) Test the mirror support structure. Chaouki Boulahouache

  19. Mount A (Pivot) Mount B (Free) Mount C (Fixed) Mirror Mount Testing(2) After assembly Chaouki Boulahouache

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