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ALICE seen by a student

ALICE seen by a student. FROM CERN webpage. FROM http://aliceinfo.cern.ch. FROM http://aliceinfo.cern.ch. TRD (Transition Radiation Detector). • | η |<0.9, 45°< θ <135° • 18 supermodules in Φ sector • 6 Radial layers • 5 z-longitudinal stack  total 540 chambers

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ALICE seen by a student

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  1. ALICEseen by a student

  2. FROM CERN webpage

  3. FROM http://aliceinfo.cern.ch

  4. FROM http://aliceinfo.cern.ch

  5. TRD(Transition Radiation Detector) • |η|<0.9, 45°<θ<135° • 18 supermodules in Φ sector • 6 Radial layers • 5 z-longitudinal stack  total 540 chambers  750m² active area  28m³ of gas • In total 1.18 million read-out channels FROM C. Adler -- Hadron Collider Physics, Les Diablerets, 4-9 July 2005

  6. TRD(Transition Radiation Detector)

  7. What is transition radiation? “Transition radiation is emitted whenever a charged particle crosses an interface between two media with different dielectric functions.” - L.Durand, Phys. Rev. D 11, 89(1975) • Predicted : Ginzburg & Frank, 1946 • Observed : Goldsmith & Jelly, 1959(optical) • It’s sizeable(X-rays) for relativistic particles. FROM A. Andronic -- an overview for students, GSI, Feb. 6th, 2007

  8. TRD working principle The total energy loss by TR for charged particle : depends on its Lorentz factor γ = E / mc2 Usefullness of TR : For discrimination the electron from hardons in the momentum range between 1GeV/c and 100GeV/c. Cut through one side of a TRD readout chamber FROM P. Shukla -- ICPA-QGP'05, Kolkata, 8-12 February 2005

  9. TRD working principle Cut through one side of a TRD readout chamber FROM P. Shukla -- ICPA-QGP'05, Kolkata, 8-12 February 2005

  10. TRD(Mechanical structure) Cut through one side of a TRD chamber

  11. TRD(Amplification region) Cut through one side of a TRD

  12. TRD(Readput chamber) Cross section through a TRD detector module

  13. TRD(Cathod pad plane) Cut through one side of a TRD

  14. TRD(Backside of TRD) Cut through one side of a TRD

  15. TRD(MCM motherboard) Cut through one side of a TRD

  16. Summary

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