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Simulation of a Ring Imaging Cerenkov detector to identify relativistic heavy ions. Manuel Fernández-Ordóñez Universidad de Santiago Compostela.

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Presentation on theme: "Simulation of a Ring Imaging Cerenkov detector to identify relativistic heavy ions. Manuel Fernández-Ordóñez Universidad de Santiago Compostela."— Presentation transcript:

1 Simulation of a Ring Imaging Cerenkov detector to identify relativistic heavy ions. Manuel Fernández-Ordóñez Universidad de Santiago Compostela

2 R 3 B Project

3 Detector requirements - Ionization chamber (MUSIC):  z/z  0.5 - Position detectors:  x  200  m - Velocity measurements:  /   10 -3 In order to separate two neighbouring heavy nuclei it is necesary:  (A/q) / (A/q)  1/350 ToF techniques present severe constraints to achieve a velocity resolution  10 -3 for large angular ranges. RICH advantages: High velocity resolution. Large angular aceptance. RICH disadvantages: Beam intensity loss due to nuclear interactions. Loss in identification resolution due to atomic interactions. RICH

4 Cerenkov radiation characteristics NatureMaterialnT th GasHe1.000035> 110 GeV/u Aerogel1.004> 9 GeV/u Aerogel1.11.3 GeV/u LiquidC 6 F 14 1.28550 MeV/u SolidMgF 2 1.43375 MeV/u SolidSiO 2 1.56280 - 750 MeV/u Frank-Tamm relation:

5 Velocity determination from the Cerenkov ring radii 8 mm thickness C 6 F 14 radiator. 96 Ru at 1 GeV/u R RR

6 Simulated performances of different radiators -The radiators have different ranges. -The required velocity resolution is achieved for ions above Z=15. (2mm) (4 mm) (2mm) 600 MeV/u 700 MeV/u for C 6 F 14

7 Key experiments: Fission 238 U + Pb (600 A MeV) Atomic interactions for 96 Ru

8 Conclusions -RICH detectors are better suited than ToF techniques to achieve high accuracy velocity measurements for large angular ranges. However they induce additional uncertainty sources: atomic and nuclear interactions Simulation. - Detailed simulations have been made: geometry, particle tracking, interactions of heavy-ions with matter, Cerenkov radiation, photon absortion, quantum efficiency and granularity of the photon detector. - Comprehensive analysis of the performances of different radiators: radiator thickness and radiator nature have been also made.

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