CTDR_Detecteur

 Constructor for the weighting potential 
 We retrieve 2 TTree from a file. These data tree contain data of the weigthing potential inside a logical pixel of
 our detector, for the X, and Y channel. The data are obtained from a finite-emelent analysis software, COMSOL multiphysics, and
 we retreive an array of 100*100*100 for nodes inside the model at constant distance. Each data point
 is assigned a unique ID calculated from its position. It allow us to get the memory adress of a weighting potential value
 by calculating the ID associated to the position where we need the value. We then retreive the weighting potential
 value from the tree using this unique ID pointing to its adress in the tree's memory  The data trees are created one time , 
 prior to simulation, using Treereader.c ROOT script  his allow to modify the script to use weighting potential Data 
 from various sources without touching this code.The Storage of the data in .root files allow to get in memory large amount of data, 
 compressed with an efficient method that allow a fast acces to data in the tree.  
 
 See class Field for comments on function uncommented here, they are clones that will eventually be
 merged as one single polymorphic class.                  

 For the weigting potential , we pay special attention to the values at the surface,
 So we switch top two dimensional interpolation close to the surface, mainly to avoid some bug
 seen when using 3-D interpolation.          

 See CTDR_Field 

 The 2-D interpolator, works like the 3-D one.

 This methods calculate the integration constant for inducted charge integral
 for a whole CTDR_Interaction :

 Inducted charge=sum of final weigting potential - sum of initial weighting potentials 

 This function compute the inducted charge during simulated and write to a file 
 the inducted charge in X, and Y channel each time the function is evoked

 This function compute the inducted charge during simulated and write to a file 
 the inducted charge in X, and Y channel each time the function is evoked

 This function is used to write the final inducted charge to a file.
 The difference with the previous function is that the time is not written
 I use this function to accumulate in a file final charge values of many events to create scatter plots

 Data acces method for the wighting potential value for X channel

 Data acces method for the wighting potential value for Y channel

 A test function, outputs the potential for a given position