Thesis presentation - APC

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Detected photon number Observatory : 94 ⇒ Spread dues on different parameters (water quality, PMT response, optical glue…) Orsay : 71 => obtained with black box measurement and with VEM charge histogram ⇒ Orsay value lower than Observatory average value ⇒ water quality Observatory Ref. Barnhill-2004 24
Decay time (τ) Orsay test detector - VEM H Voltage (mV) 800 600 400 200 Orsay : 51ns Observatory : 60 - 80ns Voltage (mV) 0 100 200 300 400 time (ns) 600 400 200 0 0 100 200 300 400 time (ns) Voltage (mV) 800 600 400 200 0 0 100 200 300 400 time (ns) • Difference between Orsay and the Observatory => water quality • 9% difference for τ between the VEM and the VEM H for the Orsay tank 25
Page 1 and 2: PIERRE AUGER OBSERVATORY SURFACE DE
Page 3 and 4: FRAMEWORK I - Presentation II - Exp
Page 5 and 6: Surface array Čerenkov detectors :
Page 11 and 12: • Allow a detailed study of the s
Page 13 and 14: Photomultiplier tubes (PMT) • PMT
Page 15 and 16: Bases and high voltage modules (HV)
Page 17 and 18: measured by Auger - UCLA collaborat
Page 19 and 20: Dynode to anode ratio measurements
Page 21 and 22: Detectors calibration unity VEM con
Page 23: Difference between the VEM and the
Page 29 and 30: Parameters Wavelength dependent •
Page 31 and 32: Physical Processes • Čerenkov ef
Page 33 and 34: Auger VEM H Charge to amplitude rat
Page 35 and 36: Comparison between 1 PMT and the av
Page 39 and 40: Baseline stability Orsay => 0,00045
Page 41 and 42: Control data Evolution in time of t
Page 43 and 44: event 762238 - 18 tanks Cuve 105 So
Page 45 and 46: constant Muon flux and altitude ∝
Page 47: LED signals Black box Tank For the

Thesis presentation - APC

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