EMC R&D for SuperB David Hitlin US/Canada SuperB Meeting September 3, 2008 David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 1 New EMC endcaps 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 be tolerable 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) as well as showers from off-energy electrons that (hopefully) hit the inner shielding The forward CsI(Tl) endcap crystals must be replaced with crystals having a faster scintillation light decay time that are more radiation hard
There are good physics motivations to increase solid angle coverage with a rear endcap used primarily as a veto Lead/scintillator technology should suffice Participating institutions (to date): Bergen, Caltech, Edinburgh, McGill, Perugia, QMC (U of London) David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 2 EMC R&D for SuperB Forward endcap We need A crystal with a smaller Molire radius A crystal that is more radiation hard A crystal with a faster decay time We have an excellent candidate in LYSO, which is under development by Ren-Yuan Zhu at Caltech Crystals are expensive ($50/cc) at present, but we believe (and have a letter stating) that the price can be brought down to ~$15/cc More work remains to be done on improving the crystal growth process Characterize trace impurities improve radiation hardness Improve uniformity of cerium and yttrium doping in the Czochralski process Optimize crystal yield of a given size in a particular boule diameter
Reduce phosphorescence Further develop new supplier relationship David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 3 What remains to be done (forward endcap) ? Nearly everything Seeking R&D funding (DOE, INFN, UK) We have taken a CDR-level look at many items, but we must organize and expand the effort for the TDR phase to be capable of producing an optimized engineered design Crystal properties optimization and procurement plan Geometry design and optimization Mounting structure APD readout
Calibration system Front end electronics and integration with barrel DAQ Trigger integration Online and offline software A beam test (at DESY or BINP) is in the planning stage David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 4 Forward endcap layout CDR Layout .36 m3 The CDR segmentation algorithm needs to be optimized: Smaller crystals at smaller radii Enforce boule yield constraints David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 5 2520 crystals
Candidate endcap crystal geometry Constraint: a 60mm diameter SIPAT boule must yield two crystals Stefano Germani David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 6 Cartesian endcap geometry (Frank Porter) All crystals are identical David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 7 LSO/LYSO is in mass production CTI: LSO David Hitlin CPI: LYSO US/Canadian SuperB Meeting
Saint-Gobain LYSO Sept. 3, 2008 8 David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 9 David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 10 Sichuan Institute of Piezoelectric and Acousto-optic Technology (SIPAT) David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 11
5x5 Projective LYSO array with CsI(Tl) surround A 7x7 array is best, but it can be approximated by a 5x5 array surrounded by CsI(Tl) to catch the outer few percent of shower 16 spare BABAR CsI(Tl) crystals may be available David Hitlin CMS APD readout module 2 @ 5mmx5mm APD (10x10mm APDs are now available) US/Canadian SuperB Meeting Sept. 3, 2008 12 Beam test budget estimate (M&S) Item Unit Cost cost ($) (K$) LYSO Crystal @ $50/cc (for the test only) x24
6250 150 CMS type dual APD module 2 x Hamamatsu S6664-55 (x(24+16)) 250 10 Preamplifier/Shaper (x24+16) 200 8 DAQ system 10 Source carriage 2 Beam test mounting structure 20 Total M&S (w 25% contingency) David Hitlin US/Canadian SuperB Meeting
250 Sept. 3, 2008 13 Monte Carlo studies The Perugia group is developing a GEANT4 simulation to optimize the crystal dimensions, the wrapping, the mounting structure, etc. Initial studies have been presented Optimization is underway Stefano Germani David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 14 Dead Material comparison BABAR-like geometry (B.Aubert et al. Nucl.Instrum.Meth.A479:1-116,2002)
: Each Crystal wrapped with 2 x 165 m Tyvek 25 m Al 13 m Mylar Each module wrapped with Mylar 300 m Carbon fiber Al Tyvek Crystal CMS-like geometry : (CMS EDR IV ) Crystal inside Carbon Fiber matrix Inner wall thickness 400 m Outer wall thickness 300 m Crystal Carbon fiber clearance 100 m Module Gap 100 m C Fiber Air
Crystal 3x3 Module Carbon Fiber 3x3 Module Ai r Stefano Germani David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 15 Rear endcap acceptance studies Many of the main physics objectives of SuperB involve missing energy signatures Use of the recoil technique Excellent reconstruction efficiency for hadronic B decays, especially those involving D*s Excellent particle ID Hermeticity Improving backward calorimeter coverage can pay large dividends
in signal/background Study using B benchmark Rear endcap has had little real work done: There is a concept based on tile calorimeter prototype work at DESY for ILC BKGD/Signal with smearing M. Mazur Backward polar angle coverage (radians) David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 16 Rear endcap tile pattern concept (Eigen) Pb plates with tile/fiber SiPM readout Is projective geometry needed? Since tiles are read out individually, there are a large number of channels even in a small device Can channels be gain-matched and analog-summed? David Hitlin US/Canadian SuperB Meeting
Sept. 3, 2008 17 David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 18 Conclusions We have organized the nucleus of a group to do the R&D needed for the SuperB TDR: to design (and eventually) build an upgraded EMC for SuperB The US contingent is at present small - there is plenty of for other groups room to make an impact on the design and on a beam test We have focused initial effort around a LYSO beam test of a projective array of size adequate to understand in detail shower response and containment A concept exists for the rear endcap calorimeter There are EMC R&D meetings approximately every two weeks on Wednesday at 8:30AM PST/5:30PM ECT If you would like to join up, let me know and you will be added to the email list There are a lot of interesting issues still to be addressed, and lots of opportunities to contribute More details will be presented in the parallel sessions
David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 19 David Hitlin US/Canadian SuperB Meeting Sept. 3, 2008 20 Scintillating Crystals for HEP Crystal NaI(Tl) CsI(Tl) CsI BaF2 BGO PbWO4 LSO(Ce) GSO(Ce)
Density (g/cm3) 3.67 4.51 4.51 4.89 7.13 8.3 7.40 6.71 Melting Point (C) 651 621 621 1280 1050 1123 2050
Crystal Ball CLEO BABAR Belle BES III KTeV, E787 TAPS (L*) (GEM) L3 CMS ALICE PANDA? (BTeV) SuperB? - Molire Radius (cm) a Hygroscopicity Luminescence (at peak) Decay Time
Light Yield d(LY)/dT b b b,c Experiment b (nm) David Hitlin BELLE PANDA? US/Canadian SuperB Meeting Sept. 3, 2008 21 Photo-Luminescence-weighted Q.E. LSO / LYSO David Hitlin US/Canadian SuperB Meeting
Sept. 3, 2008 22 Edep mean and mpv Edep mean : Most Probable Value: Fit independent Fit Function parameter P1 Xtal - Xtal C-Fiber thickness: -Inside Module : 400 m - Across Module: 600 m Very small difference!!! David Hitlin US/Canadian SuperB Meeting Stefano Germani Sept. 3, 2008 23 Edep vs Projectivity Edep mpv
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