NESTOR SIMULATION TOOLS AND METHODS Antonis Leisos Hellenic Open University Vlvnt Workhop.

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Presentation transcript:

NESTOR SIMULATION TOOLS AND METHODS Antonis Leisos Hellenic Open University Vlvnt Workhop

Physics Simulation Cherenkov light emition and propagation OM response PMT Waveform generation (signal) Trigger & Electronics Response Raw Data Format GEANT4 HOME MADE

Physical Processes Neutrino interaction, vertex simulation μ and e interactions into the water Cherenkov Emition Multiple scattering Bremsstrallung Ionisation (delta rays) pair production Muon nucleus interaction Electromagnetic and Hadronic Showers etc

Cherenkov photon generation & interactions Generation of Cherenkov photons Primary or Secondary Particle Tracking Absorption in water Boundary processes & scattering Optical photon Tracking

Optical Module description Detailed geometrical description Material Description (absorption, refraction index)

A muon track (100 GeV)Shower Development Example of GEANT4 full simulation

Waveform generation (a) Pulse height distribution for one pe (measured) Pulse Shape Transition Time distribution for one pe Treat independently each pe produced during the GEANT4 Simulation

Waveform generation (b) Add Background pulses due to thermionic noise and the K40 radioactivity. The pulse height distribution of the thermionic noise has been measured at the Lab. The K40 background pulses follow the characteristic pulse height distribution of a single pe. The arrival time of the background pulses is random The linear sum of the simulated response to each pe generates the PMT Waveform.

Electronics response Detailed simulation of : PMT Pulse Attenuation & Delay (see A. Tsirigotis talk) PMT Pulse Digitization in the ATWDs Trigger formation Data Formatting (using the raw data protocol)

Example of MC Simulation

Parameterization of the expected PMT Response (a) Because we have to use the Collected PMT Charge in the Fitting Procedure… Compare the deposited charge at each PMT with the expected value for each candidate track ! ☹ Parameterization of: the Expected Mean Number of Photons at each PMT as a function of the track direction and distance form the PMT the Variance of the Distribution of the Expected Number of Photons at each PMT as a function of the track direction and distance form the PMT

Parameterization of the expected PMT Response (b) Compare the Geant4 Full Simulation of the Detector with the Parameterization of Mean Number and Variance of the Deposited PEs ☺ Pull : (Deposited Charge GEANT -Expected charge )/Error

Data from a depth of 4000 m Trigger Studies Coincidence Level Trigger Rate (Hz) Experimental Points M.C. Estimation (Atmospheric muons + K 40 ) Data Collected with 4fold Majority Trigger Thresholds at 30mV (1/4 P.E.) Total Charge inside the Trigger Window Coincidence Level Comparison of the MC Estimations with the Data Sample

Coincidence Level Trigger Rate (Hz) Total Charge inside the Trigger Window Data Collected with 4fold Majority Trigger Thresholds at 120mV (1 P.E.) Experimental Points M.C. Estimation (Atmospheric muons + K 40 ) Data from a depth of 4000 m Trigger Studies Comparison of the MC Estimations with the Data Sample

Trigger Rate (Hz) Data Collected with 4fold Majority Coincidence Trigger (greater or equal to 4fold) Coincidence Level Trigger Rate (Hz) Thresholds at 120mV (1 P.E.) Experimental Points M.C. Estimation ( Atmospheric muons + K 40 ) Thresholds at 30 mV Thresholds at 120 mV Measured Total Trigger Rates 2.61 ± 0.02 Hz 0.12 ± 0.01 Hz M.C. Prediction (atmospheric muons only) ± Hz0.12 ± 0.01 Hz Thresholds at 30mV (1/4 P.E.) Comparison of the MC Estimations with the Data Sample

Fast Simulation A good approximation for the majority of the effects we study point like shower generation of flux of photons (does not treat each photon separately) parameterization of PMT response The simulation of the electronics is an approximation of the real process The energy losses equivalent to GEANT4

Example: Eff Area Calculation (a) 15% of a Km 2 NESTOR Detector

Example: Eff Area Calculation (b)

log 10 (E μ (GeV)) 100 GeV1 PeV1 TeV100 TeV10 TeV (a)(a) (b) (c) (d) (a) 1 Tower & 3 DUMAND strings, 80 m from center of Tower, PMTs (15”) (b) 1 Tower, 144 PMTs (15”) (c) 1 Tower & 3 DUMAND strings, 80 m from center of Tower, PMTs (15”), for resolution <5º (d) 1 Tower, 144 PMTs (15”) for resolution <5º S eff (km 2 ) Example: Eff Area Calculation (c)