Lecture notes (27 pages)

Previewing pages 1, 2, 3, 25, 26, 27 of 27 page document View the full content.
View Full Document

Lecture notes



Previewing pages 1, 2, 3, 25, 26, 27 of actual document.

View the full content.
View Full Document
View Full Document

14 views

Unformatted text preview:

An LSO LYSO Crystal Calorimeter for the ILC Ren Yuan Zhu California Institute of Technology August 18 2005 2005 ILC Workshop Ren yuan Zhu Caltech 1 Why a Crystal Calorimeter Photons and electrons are fundamental particles in the SM and for new physics Performance of a crystal calorimeter is well understood August 18 2005 The best possible energy resolution good position and photon angular resolution Good e photon identification and reconstruction efficiency Good missing energy resolutions Good jet mass resolution Physics discovery potential 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 2 Physics in Crystal Calorimeters Charmonium System Observed Through Inclusive Photons Crystal Ball August 18 2005 Higgs Searches at LHC CMS 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 3 Summary of 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 1950 Radiation Length cm 2 59 1 85 1 85 2 06 1 12 0 9 1 14 1 37 4 8 3 5 3 5 3 4 2 3 2 0 2 3 2 37 41 4 37 0 37 0 29 9 21 8 18 21 22 Moli re Radius cm Interaction Length cm LSO LYSO is a unique crystal with high light output fast decay time Refractive Index a 1 85 1 79 1 95 1 50 2 15 2 2 1 82 1 85 Hygroscopicity Yes Slight Slight No No No No No Luminescence b nm at peak 410 560 420 310 300 220 480 560 420 420 440 Decay Time b ns 230 1300 35 6 630 0 9 300 50 10 40 60 Light Yield b c 100 45 5 6 2 3 21 2 7 13 0 1 0 6 75 30 d LY dT b C 0 0 3 0 6 2 0 1 6 1 9 0 3 0 1 Crystal Ball CLEO BaBar BELLE BES III KTeV TAPS L GEM L3 CMS ALICE PANDA BTeV Experiment BELLE PANDA a at peak of emission b up low row slow fast component c measured by PMT of bi alkali cathode August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 4 LSO LYSO Mass Production CTI LSO CPI LYSO Saint Gobain LYSO Additional Capability SIPAT Sichuan China August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 5 Sichuan Institute of Piezoelectric and Acousto optic Technology SIPAT Total area 52 258m2 Construction area 38 331m2 For R D 27 765m2 August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 6 SIPAT LSO Quoted Price 13 15 USD cc 80 x 70 80 x 120 Large size LSO Ce Lu2SiO5 crystals are in production August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 7 BGO LSO LYSO Samples Cube 1 7 X1 7 x 1 7 cm 1 5 X0 Bar 2 5 x 2 5 x 20 cm 18 X0 SIC BGO CPI LYSO Saint Gobain LYSO CTI LSO August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 8 Excitation Emission Transmittance Identical transmittance emission excitation spectra Part of emitted light may be self absorbed in long samples 1 7 cm Cube August 18 2005 2 5 x 2 5 x 20 cm Bar 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 9 137Cs 22Na Pulse Height Spectra Cube and bar samples have 8 and 10 FWHM resolution respectively for 137Cs 0 66 MeV and 22Na source 0 51 MeV CPI LYSO bar has double peak because of poor annealing Cube August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech Bar 10 Light Output Decay Time LSO LYSO Light yield a factor of 6 100 of BGO PWO Bar sample has 50 light of the cube sample LSO LYSO decay time 42 ns compared to 300 ns of BGO Cube August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech Bar 11 Emission Weighted Q E Taking out PMT QE LO of LSO LYSO is 4 times BGO For Si PD and APD QE is 59 and 75 respectively August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 12 LSO LYSO with Si Readout LSO LYSO not BGO bars can be read in lab by using a single APD of 25 mm2 not Si PD and 0 51 MeV 22Na source Cube Bar Bar August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 13 LYSO Light Response Uniformity Uniformity depends on which end coupled to the PMT indicating a not uniform light yield along crystal August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 14 Possible Origin of Non Uniformity C Melcher LO in LSO is a function of Ce concentration B Chai LO in LYSO is a function of atomic fraction of Yttrium August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 15 Radiation Damage in LYSO Damage effect in LRU and LO is small after 22 h ray irradiations at 9 000 rad h better than PWO August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 16 Radiation Induced Phosphorescence Phosphorescence peaked at 430 nm with decay time constant of 2 5 h observed August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 17 ray Induced Readout Noise Sample L Y F Q15 rad h Q500 rad h ID p e MeV A rad h p e p e MeV MeV CPI 1 480 41 6 98x104 2 33x106 0 18 1 03 SG 1 580 42 7 15x104 2 38x106 0 17 0 97 15 rad h 500 rad h ray induced PMT anode current can be converted to the photoelectron numbers Q integrated in 100 ns gate Its statistical fluctuation contributes to the readout noise August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 18 L3 BGO Resolution Contribution Radiative Intrinsic Temperature Calibration Overall Barrel 0 8 0 5 0 5 1 07 Endcaps 0 6 0 5 0 4 0 88 12k BGO August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 19 CMS PWO Resolution 77k PWO Designed Resolution Energy Resolution E E 1 if E 25 GeV E E 0 5 at 120 GeV Monitoring 0 04 2004 SM Beam Test August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 20 LSO LYSO ECAL Performance A better energy resolution E E at low energies than L3 BGO and CMS PWO because of its high light output and low readout noise 2 0 2 5 E 0 5 0 55 0 002 E 2 E Less demanding to the environment because of small temperature coefficient Radiation damage is less an issue as compared to the CMS PWO ECAL No degradation if ILC energy increases August 18 2005 2005 ILC Workshop Snowmass Ren yuan Zhu Caltech 21 Single Multi Photons Physics L3 BGO was the best ECAL at LEP Efficiency 73 Purity 99 Precision 0 5 RFQ calibration Best sensitivity at LEP Physics Topics Include Neutrino Production SM Extra Dimensions …


Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Lecture notes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Lecture notes and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?