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Integration of ZDC Into CMS Experiments

Integration of ZDC Into CMS Experiments. Kevin Reynolds Norfolk State University Michael Murray, Mentor University of Kansas. August 10, 2006 Univ. of Michigan REU @ CERN 1. Primary Goals for This Project.

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Integration of ZDC Into CMS Experiments

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  1. Integration of ZDC Into CMS Experiments Kevin Reynolds Norfolk State University Michael Murray, Mentor University of Kansas August 10, 2006 Univ. of Michigan REU @ CERN 1

  2. Primary Goals for This Project • Assist in the integration of forward detectors, ZDC, and CASTOR into CMS experiment • Work on layout of electronics for ZDC and modification of existing CMS HF electronics to produce technical triggers for CMS global trigger • Assist with beam tests of ZDC and CASTOR and the analysis of the test beam data August 10, 2006 Univ. of Michigan REU @ CERN 2

  3. ACRONYMS • RPC- resistive plate chamber • USLB- optical serial link board • HB- hadronic barrel • TWiki- a “quick” software for generating web pages • I & C-integration and calibration • ME-muon endcap • HE-hadron endcap • TOF-time of flight • DCS- detector control system • ADC-analog digital converter • DAQ-data acquisition software • HI-heavy ion • HIROOT-generator level simulation package for heavy ions • QCD-quantum chromodynamics • VCAL/HF-very forward calorimeter • GUT-grand unified theory • USC- underground service cavern • TAN-neutral particle absorber • GEANT-geometry and tracking • CERN-European (Council) Organization for Nuclear Research • CMS-compact muon solenoid • ATLAS-a toroidal LHC apparatus • ALICE-a large ion collider experiment • LHCb-LHC-beauty • LEP-large electron positron collider • PSB-proton synchrotron booster • PS-proton synchrotron • SPS-super proton synchrotron • TOTEM-total cross section, elastic scattering and diffraction dissociation • ZDC- zero degree calorimeter • CASTOR-CERN Advanced Storage Manager • QIE-charge integrator and encoder • ECAL- electromagnetic calorimeter • HCAL- hadronic calorimeter • PMT-photomultiplier tube • MTCC- magnet test cosmic challenge • UXC- experimental underground crossing • RHIC-relativistic heavy ion collider (BNL) • CMSSW-CMS software • ROOT-an object-oriented data analysis framework August 10, 2006 Univ. of Michigan REU @ CERN 3

  4. Where We Fit Into the Big Picture… CMS LHC LHCb SPS ALICE ATLAS Synchrotron Injector Tunnels Pb PS Experimental Station P PSB August 10, 2006 Univ. of Michigan REU @ CERN 4

  5. Peak Luminosity ~ 1 Billion Solar Luminosity Compact Muon Solenoid August 10, 2006 Univ. of Michigan REU @ CERN 5

  6. Peak Luminosity ~ 1/2 Solar Luminosity Integration of the Zero Degree Calorimeter • Main components for EM and HAD sections (tungsten, PMTs, fibers, frame, etc.) shipped to Previssin site for testing (Aug.1-2,2006) • Assemby begins over weekend (Aug.4,2006) • Readout cables have been cut and are being delivered by CERN ( Aug.4,2006) • Beam tests on ZDC will to begin late Wednesday or early Thursday (Aug. 9,2006) • Installation of ZDC1 into LHC (Sept. 2006) z ZDC2 140 m INTERACTION POINT 140 m ZDC1 August 10, 2006 Univ. of Michigan REU @ CERN 6

  7. Preparation for Beam Tests • The upper part of the beamline sensitive to Cherenkov raditation was disassembled and the lens checked for contaminants. The photomultipler tube was then reassembled, vacuumed down, and refilled with freon gas. The pressure for the tube held over night, a good indication that the chamber was hermetically sealed. (6-28-06) Cherenkov detector Scintillators Wire Chambers Beamline August 10, 2006 Univ. of Michigan REU @ CERN 7

  8. Electronics: Cherenkov Detector c>v>vt Stationary With Respect to Particle Moving With Respect to Particle v v θ n>1 n>1 cos θc = vt / v = c / (vn) = 1/ (βn) August 10, 2006 Univ. of Michigan REU @ CERN 9

  9. The emission angle of Cherenkov radiation θcincreases with the refractive index of gas n. The number of photoelectrons Npe detected increases with the refractive index of gas n. Index of Refraction cos θc = vt / v = c / (vn) = 1/ (βn) Npe = L (α2z2 / remec2) ∫ єcoll(E) єdet sin2θc (E) dE August 10, 2006 Univ. of Michigan REU @ CERN 10

  10. Electronic Layout for ZDC ZDC PMT QIE HTR DCC RU CPU • Photomultipler Tube (PMT) • Converts photons to electrons via photoelectric effect • Electrons drawn across HV • Cascade of electrons produced from collisions with dynodes • Charge Integrator and Encoder (QIE) • Accepts analog signal (parallel) • Converts analog to digital • Sends out digitized signal through optical fibers (serial) • Hadronic Trigger Region (HTR) • Accepts digital signal • Calculates deposited energy and time of flight • Decides which events to save • Data Concentrator Card (DCC) • Packs data from events • Readout Unit (RU) • Unpacks data so that events can be triggered and read z August 10, 2006 Univ. of Michigan REU @ CERN 11

  11. Beam Tests: ZDC Readout August 10, 2006 Univ. of Michigan REU @ CERN 12

  12. Acknowledgements • National Science Foundation • Ford Motor Company • University of Michigan • Dr. Homer Neal • Dr. Jean Krisch • Mr. Jeremy Herr • Michael Murray, Mentor • David d'Enterria , Co-mentor • Scientists at CERN Previssin site August 10, 2006 Univ. of Michigan REU @ CERN 13

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