Energy Reconstruction in ESAFby Firenze group

Data loaded from: Patern recognition (cluster of RecoPixels) TrackDirectionModules(1,2): Theta and Phi (and

hopefully the track line on FS – not yet)

6-7 October 2005 Grenoble

The basic idea is to relate number of p.e. at a given time to Energy of EAS

Np.e.(T) = E/E1 x Q x Efficacy(x,y)IsInsidePixel() x Flux(T),

where Flux(T) = Ne(T) x Fluo Yield x Track Length x Transmission x Solid Angle

● An example of event to deal with

● … from EnergyViewer

Energy Reconstruction in ESAF

Energy Reconstruction in ESAF Reconstruction algorithm:

Sort pixels in GTU and prepare maps <GTU, vector<RecoPixelData*>>

Fit the track on the FS as a straight line and get ThetaFoV and PhiFoV as a function of the track line position

Find ThetaFoV at the shower maximum Given Theta, Phi of the ShowerTrack and ThetaFoV

and estimate for the shower maximum altitude (from HmaxXXXModules) estimate fluorescence yield at the shower maximum and mean attenuation. Make also a spectrum of fluorescent photons at the entrance pupil taking into account the spectrum at the production point and attenuation.

Make the background estimation: various methods (examing pixels around the track, looking track pixels but at different moments of time) – gives agreement results with simulated background

6-7 October 2005 Grenoble

OK

OK but should be taken from TDM

OK, need to iteratedOK but I want to improve it

OK

Energy Reconstruction in ESAF Reconstruction algorithm:

Compute efficacy for the track (take into account dead spaces of PMTs and Pixels, holes in FS)

Simulate ShowerTrack object with E=10^21 eV and reconstructed Theta and Phi and with the maximum of around the found one.

Search for the Cherenkov peak Fit the time distrubution (taking into account photon to

p.e. conversion, optics and FS, atmosphere attenuation, shower production in space.

All steps are extensively and optionaly debugged (created the gzipped PS file with all relevant information).

6-7 October 2005 Grenoble

OK

OK in general but to be extensively testedOK but not usedOK, should be improved to take all steps of production OK

● Shower Track on FS

Energy Reconstruction in ESAF

● ThetaFoV and PhiFoV vs GTU

Energy Reconstruction in ESAF

● X,Y vs GTU

Energy Reconstruction in ESAF

● Recovering efficacy

Energy Reconstruction in ESAF

● Recovering efficacy

Energy Reconstruction in ESAF

● Recovering efficacy

Energy Reconstruction in ESAF

● Recovering efficacy

Energy Reconstruction in ESAF

● Another example

Energy Reconstruction in ESAF

Energy Reconstruction in ESAF

Curent and Future work

• Debuging all steps• Make better fluorescence shower (for all GTU own, and not the mean as it is now• Make backscattered Cherenkov light• Improve Fitting procedure (make it more complex).

Energy Module is now splitted:1. EnergyModule class2. EnergyViewer class3. EnergyFitUtils – collection of C routines