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DING CONGJIN LU GUICHI MARSEILLE

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Presentation on theme: "DING CONGJIN LU GUICHI MARSEILLE"— Presentation transcript:

1 DING CONGJIN LU GUICHI 21-07-2017 MARSEILLE
The auger experiment DING CONGJIN LU GUICHI MARSEILLE Good afternoon, I am Luguichi. Our experiment is The auger experiment. I will introduce you the first part and My partner Dingcongjin, will continue in the second part.

2 OBJECTIVE Pierre Auger performed measurements of the cosmic ray showers Reproduce Auger’s experiment using the plastic scintillator detectors of cosmo-detector CPPM, Marseille 2018/12/8

3 detector The scintillator The photomultiplier (PMT)
Data acquisition board (DAQ) scintillator photomultiplier CPPM, Marseille 2018/12/8

4 Detecting principle Identify muons (cosmic ray) from the background (thermal noise, environmental radioactivity) by counting the coincidence Using a coincidence time window of 100 ns guaranties to select signal from muons CPPM, Marseille 2018/12/8

5 Random coincidence rate
R12 = n1n2T n: background event rate T: coincident time windows The random coincidence rate can be ignored! CPPM, Marseille 2018/12/8

6 Part 1: determine the efficiency
C12 = R_mu * Eff1 * Eff2 * Delta_Omega C123 = R_mu * Eff1 * Eff2 * Eff3 * Delta_Omega Eff3 = C123 / C12 CPPM, Marseille 2018/12/8

7 Part 1: determine the efficiency
CPPM, Marseille 2018/12/8

8 Part 2 cosmic ray rate versus distance
Perform measurements of coincidence rate of two detectors at different distances (0-2m) to study the later distribution of the cosmic shower CPPM, Marseille 2018/12/8

9 Part 2 cosmic ray rate versus distance
CPPM, Marseille 2018/12/8

10 Part 2 cosmic ray rate versus distance
Extend measurements using e-Péron data from the Pic du Midi Observatory 9 detectors at different distances Choose a normalisation point to normalize the data CPPM, Marseille 2018/12/8

11 results Distance uncertainty Statistical uncertainty CPPM, Marseille
2018/12/8

12 conclusion The density of cosmic ray decreases from center to edge
Fitting the expectation of cosmic ray shower Auger experiment has been reproduced successfully CPPM, Marseille 2018/12/8

13 Thank you for your attention
Questions welcomed

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