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Calorimeters Design Issues and Simulation Needs

Calorimeters Design Issues and Simulation Needs . C.Woody Physics Department Brookhaven National Lab. EIC Simulation Workshop Oct 9, 2012. Design Issues for a Calorimeter System for an EIC Detector.

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Calorimeters Design Issues and Simulation Needs

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  1. Calorimeters Design Issues and Simulation Needs C.Woody Physics Department Brookhaven National Lab EIC Simulation Workshop Oct 9, 2012

  2. Design Issues for a Calorimeter System for an EIC Detector • Must cover the phase space and kinematic range necessary to carry out the suite of physics measurements at EIC • The requirements are different in different regions of phase space • Must work in conjunction with the tracking system of the EIC detector to provide the necessary energy/momentum resolution to carry out the physics measurements • The calorimeters must cope with the backgrounds produced by the machine and surrounding materials, and must survive the radiation environment • The detectors must work in the presence of a strong magnetic field C.Woody, EIC Simulation Workshop, 10/9/12

  3. EIC Detector – Conceptual Design Central Detector Forward/Backward Detectors HAD EM EM HAD EM EM EM HAD • Large acceptance: -5 < h < 5 • Asymmetric • Nearly 4p tracking and EMCAL coverage • HCAL coverage in central region and hadron direction • Good PID • Vertex resolution (< 5 mm) • Electron is scatted over large range of angles (up to ~165˚) • Low Q2 → low momentum (~ few GeV) • Requires low mass, high precision tracking C.Woody, EIC Simulation Workshop, 10/9/12

  4. Momentum and Angle Resolution Measurement of FL(x,Q2) Assumption: To measure yield to 1% requires 20% uncertainty due to bin shifts From the sPHENIX MIE Proposal (T.Hemmick) 5 x 100 5 x 250 electron direction proton direction C.Woody, EIC Simulation Workshop, 10/9/12

  5. Kinematic Coverage and Resolution - DIS From the sPHENIX MIE Proposal (S.Bazilevsky) h<-1 |h| < 1 Eevsh Note: Cutting out low momentum electrons (E<1 GeV) does not loose much in x and Q2 h<-1 |h| < 1 e e p p g Energy resolution is especially important at low y Defines “reach” in y (→ higher x) g C.Woody, EIC Simulation Workshop, 10/9/12

  6. Kinematic Coverage and Resolution - DVCS From the sPHENIX MIE Proposal (S.Bazilevsky) |h| < 1 h>1 h<-1 Egvsh DVCS photon is mainly in central region and fairly low energy C.Woody, EIC Simulation Workshop, 10/9/12

  7. Energy Resolution vs Tracking Resolution S.Bazilevsky, FSU PHENIX Collaboration Meeting Resolution on x and Q2 (5 x 250) • Tracking: p/p = 0.01p + 0.01 • EMCal: E/E = a/sqrt(E)  0.02 • = Track, if Track < EMC • = EMC, if EMC < Track Tracking only • EMC = Track • a=5%  E ~ 2.7 GeV • a=10%  E ~ 4.2 GeV • a=20%  E ~ 7 GeV a=20% a=10% C.Woody, EIC Simulation Workshop, 10/9/12

  8. HCAL Outer HCAL Inner EMCAL Solenoid VTX Coverage ± 1.1 in h and 2p in f C.Woody, EIC Simulation Workshop, 10/9/12

  9. sPHENIX Calorimeters Tungsten-Scintillating Fiber “Optical Accordion” EM Calorimeter SiPM + Mixer Scintillating Tile WLS Fiber HCAL C.Woody, EIC Simulation Workshop, 10/9/12

  10. sPHENIX Calorimeter Simulations (GEANT4) 10 GeV pion shower 10 GeV electron shower resolution = (14.0  0.2)%/E C.Woody, EIC Simulation Workshop, 10/9/12

  11. STAR Forward Calorimeter O.Tsai, H.Huang (UCLA) Results from beam test at Fermilab (Jan 2012) Spacal/Spacordion Tungsten Powder/Epoxy/SciFi 11 C.Woody, EIC Simulation Workshop, 10/9/12 C.Woody, sPHENIX Review - EMCAL, 10/5/12

  12. STAR Forward Calorimeter Simulations O.Tsai(UCLA) C.Woody, EIC Simulation Workshop, 10/9/12

  13. PWO Crystal Calorimeter for PANDA Endcap 3864 crystals Barrel 11360 PWO-II crystals 200 mm long 15 GeV Positrons R. Novotny, CALOR12 C.Woody, EIC Simulation Workshop, 10/9/12

  14. Radiation Effects on Detectors CMS Crystals P.Adzic et.al., JINST Vol.5 (2010) P03010 JLAB SiPMs Radiation dose after 500 fb-1 (~ 10 yrs) Y.Qiang et.al, arXiv:1207.3743v2,17 July 2012 C.Woody, EIC Simulation Workshop, 10/9/12

  15. Needs for Monte Carlo Simulation(not an all inclusive list…) • Further refinements are needed on the calorimeter requirements for energy resolution, segmentation, etc over the required kinematic range. • This needs to be integrated with the requirements on the tracking system for momentum • resolution, vertex capabilities, etc over the same kinematic range. • The calorimeters and tracking detectors should be considered as a combined system • when looking at these requirements. • Improve simulation models of some of the proposed detector designs (e.g., include realistic geometry of absorber and active material, effects of light collection, dead material, etc). This is important to study the non-uniformities that may exist in the proposed designs and could lead to important systematic effects. • Improved simulations of machine backgrounds that generate backgrounds in the various detectors (particularly soft electrons, gammas and neutrons) • Compute radiation levels and neutron fluences over the solid angle subtended by the various detectors. This needs to include a realistic model of the IR design and the overall detector itself. • …. C.Woody, EIC Simulation Workshop, 10/9/12

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