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EMC R&D for Super B

EMC R&D for Super B. DRAFT Super B R&D Meeting David Hitlin February 14, 2008. EMC R&D for Super B. With the likely time structure of SuperB, backgrounds and radiation damage to the EMC should be reduced from those at a 10 36 conventional collider

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EMC R&D for Super B

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  1. EMC R&D for SuperB DRAFT SuperB R&D Meeting David HitlinFebruary 14, 2008

  2. EMC R&D for SuperB • With the likely time structure of SuperB, backgrounds and radiation damage to the EMC should be reduced from those at a 1036 conventional collider • In the barrel region, rates and radiation dose should betolerable • The barrel EMC should be usable at SuperB • In the endcap region, at least, there will be multi-Bhabhas within the decay/integration time of the CsI(Tl) • A faster scintillator with a smaller Molière radius may be needed • We have an excellent candidate in LSO or LYSO, which is under active study by Ren-Yuan Zhu at Caltech • There are good motivations to increase solid angle coverage with a rear endcap David Hitlin SuperB R&D Meeting February 14, 2008

  3. Scintillating Crystals for HEP

  4. Photo-Luminescence-weighted Q.E. LSO / LYSO 4

  5. LSO/LYSO Mass Production Saint-Gobain LYSO CTI: LSO CPI: LYSO

  6. Sichuan Institute of Piezoelectric and Acousto-optic Technology (SIPAT)

  7. Forward endcap layout .36 m3 2520 crystals The CDR segmentation algorithm needs to be optimized

  8. Beam test budget estimate (M&S)

  9. 5x5 Projective LYSO array with CsI(Tl) surround A 7x7 array is best, but it can beapproximated by a 5x5 arraysurrounded by CsI(Tl) to catchthe outer few percent of shower 16 spare BABAR CsI(Tl)crystals may be available CMS APD readout module 2 @ 5mmx5mm APD (10x10mm APDs are now available)

  10. The Perugia group is developing a GEANT4 simulation to optimizethe crystal dimensions, the wrapping, the mounting structure,etc. Initial studies have been presented Optimization is underway Monte Carlo studies Stefano Germani

  11. Dead Material comparison • BABAR-like geometry • (B.Aubert et al. Nucl.Instrum.Meth.A479:1-116,2002): • Each Crystal wrapped with • 2 x 165 µm Tyvek • 25 µm Al • 13 µm Mylar • Each module wrapped with • 300 µm Carbon fiber • CMS-like geometry • (CMS EDR IV ): • Crystal inside Carbon Fiber matrix • Inner wall thickness 400 µm • Outer wall thickness 300 µm • Crystal Carbon fiber clearance 100 µm • Module Gap 100 µm Mylar C Fiber Al Air Tyvek Crystal Crystal 3x3 Module 3x3 Module Carbon Fiber Air Stefano Germani

  12. Edep mean and mpv Edep mean : Fit independent Most Probable Value: Fit Function parameter P1 • Xtal - Xtal C-Fiber thickness: • Inside Module : 400 µm • Across Module: 600 µm • Very small difference!!! Stefano Germani

  13. Edep vs Projectivity Edep mpv Edep sigma Edep dist Preliminary Stefano Germani

  14. Rear endcap acceptance studies BKGD/Signal with smearing Backward polar angle coverage (radians) M. Mazur • Many of the main physics objectives of SuperB involve missing energy signatures • Use of the recoil technique • Excellent reconstruction efficiency for hadronicB decays, especially those involving D*s • Excellent particle ID • Hermeticity • Improving backward calorimeter coverage can pay large dividendsin signal/background • Study using Btn benchmark

  15. Task List - Beam Test and beyond • Crystals • Improve crystal uniformity and performance and optimize yield. • Perform other crystal-related studies relating to mechanical properties, performance and radiation hardness • Develop a procedure to characterize the performance of individual crystals • Develop a specification for radiation hardness, phosphorescence, • light output, etc. • Develop an efficient technique to make the longitudinal light collection efficiency as uniform as possible • Acquire sample crystals for lab tests, and full array the for beam test

  16. Task List - Beam Test and beyond • Readout • Develop an optimized photosensitive detector that matches the spectrum of LYSO scintillation light and works in an axial magnetic field • Devise a robust procedure for mounting the detector to the crystal • Beam Test Details • Find an available test beam facility, secure access and act as liaison • Develop a data acquisition system for the beam test. • Engineer an construct a support structure for a beam test

  17. Beyond …. • Design a support structure for the forward endcap. • Perform a Monte Carlo study of a 7x7 crystal array to determine • the optimum number of radiation lengths required • the optimum transverse dimensions of the crystals for position resolution in a busy radiativeBhabha environment (one or two crystal sizes?) • the effect of light collection non-uniformity and dead material on calorimeter performance • Devise a calibration system such as the 19F(n,α)16N system used in BABAR. • [Given the low noise and high output, ordinary sources such as 22Na and 60Co should suffice for the beam test if we are using APDs] • Design and integrate the endcap DAQ with the upgraded barrel DAQ system • More tasks ……………

  18. Details • Prepare coordinated proposals to various funding agencies • Must include a realistic time scale as well as a budget for the groups’ specific technical objective • Attract participants • Schedule beam time (DESY, CERN, BINP, ….) • Develop beam test data analysis tools • ………

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