Pulse Shape Simulation and Pulse Shape Analysis
------------------------------------------------

Field Calculations
------------------
All available field calculation programs should be available
from withing Mage:

   radford/gretina  
    field_gen [3 and 2 dimensions]
      sig_gen 
             -- adapted for Mage by Majorana

   Volynets adaptive grid/MPI
     field_gen [3 dimesnions]
             -- is in Mage 

   Maxwell [software needing a licence]
     output can be loaded in Mage

An important issue is grid size:
   The minium grid size has to be 100 micron [1ns of drift]
   close to contacts with rapidly changing fields/weigthing potentials  

The differences in results from different programs
are judged to be small compared to the uncertainties due
to unknown input parameter.

Boundary Conditions are also important

          ------------
          .           |
          .           | 
          C           |
          .           |
          .           |
          ------------

          .
          . floating = floating surfaces
          .   

          possibilities
           -- reflection symmetry -- does Maxwell do that implicitely?  
              ==> field lines go perpendicular to surfaces 
           -- implement charge density on the surface
              ==> needs adjustment with data 
  
          David has both possibilities implemented
          Burcin/Hao Giang will investigate for their calculations


Impurity densities
------------------
It will be impossible to get much improved information
about the crystals, especially the radial variations on
the impurities will be impossible to get.

We cannot measure impurity variations in radius.

We can measure the velocities, i.e  the pulselength.

It is almost impossible to disentangle mobilities adn
impurity densities.

However, we should to the best on trajectories and scan
as best as we can.
The MPI plans to do that. Help from David on analysis will
be appreciated.



Can we measure mobilities?
--------------------------

David Radford suggests to build two 
hemisphercial point contact detectors,   
d=4cm,  one n-type and on p-type.

                 ___              
              .'  |001 
             .    |  /111          side view
            /------------011 
           |      |     / |
          |       | .      | 
           -------^--------    small hemispherical point contact
                 _____
              .'   |   `.   
             .   .---.   . 
            / 3 /  |  \ 4 \        top view
           |   |   |   |   | 
          |   |  1 | 2 |    |      4 Segments in 2 rings  
           |   |   |   |   |
            \   \  |  /   /
             `.   ---   .' 
               ` __|__ '

  

Such a device was/will be simulated 
by David Radford and Lucia Garbini.

We will try to evaluate whether it makes sense to build and what
purity requirements should be put on the crystal.
We also need to specify the precision of the hemisphere.
Canberra France [M.-O.Lampert] will think whether it could be
built, or better, what it would cost.


Pulse Shape Simulation [Trajectories]
-------------------------------------

This depends on the input parameters like mobilities.
Actually the measurements are parameterized for velocities
along axes. However, only two axes are measured. The third axis
and evcerything inbetween uses model assumptions.
The same model fails for temperature dependencies. 
If we could measure with the above device, it would be greate.
However, no manpower and no money can currently be allocated.


Pulse Shape Analysis
--------------------

This concerns the extraction of fundamental parameter of a pulse
like length and amlitude. [not single-site multi-site discrimination].


   MaGe           GAT          GELATIO
   \              /           /[GERDA]  ---------------*
    \            /           /         | WF-processing |
     \          /[Majorana] /        __/_______________| 
      \        /           /      __/
   ____\______/___________/______/
  |         MGDO                 |
  |     wave form format,        |  
  |     simple algorithms        |
  |______________________________| 


Xiang, Oliver, Dmitri, Nuno will think about a new "project"*,
for which Iris is to find a name.
This will collect existing methods and make them available for everybody.
Jason will be contacted on this.

*:Wave form processing = Pulse Reconstruction = PURE


written up by IA: 18.4.2013