
///\file "analysis/AnaEx02/.README.txt"
///\brief Example AnaEx02 README page

/*! \page ExampleAnaEx02 Example AnaEx02

 Examples AnaEx01 and AnaEx02 show the usage of histogram and tuple
 manipulations using G4Analysis and ROOT compliant systems on the same
 scenario. All analysis manipulations (histo booking, filling, saving histos
 in a file, etc...) are located in one class : HistoManager, implementation of
 which is different in each example. All the other classes are same in all
 three examples.

 This example shows the usage of histogram and tuple manipulations using
 ROOT system. Please install ROOT before building this example:
 http://root.cern.ch

 The example is an adaptation of examples/novice/N03. It describes a simple
 sampling calorimeter setup.

\section AnaEx02_s1 Detector description

 The calorimeter is a box made of a given number of layers. A layer
 consists of an absorber plate and of a detection gap. The layer is
 replicated.

 Six parameters define the calorimeter :
    - the material of the absorber,
    - the thickness of an absorber plate,
    - the material of the detection gap,
    - the thickness of a  gap,
    - the number of layers,
    - the transverse size of the calorimeter (the input face is a square).

 The default geometry is constructed in DetectorConstruction class,
 but all of the above parameters can be modified interactively via
 the commands defined in the DetectorMessenger class.

<pre>
        |<----layer 0---------->|<----layer 1---------->|<----layer 2---------->|
        |                       |                       |                       |
        ==========================================================================
        ||              |       ||              |       ||              |       ||
        ||              |       ||              |       ||              |       ||
 beam   ||   absorber   |  gap  ||   absorber   |  gap  ||   absorber   |  gap  ||
======> ||              |       ||              |       ||              |       ||
        ||              |       ||              |       ||              |       ||
        ==========================================================================

</pre>

\section AnaEx02_s2 Physics list

   The particle's type and the physic processes which will be available
   in this example are set in the FTFP_BERT physics list.

\section AnaEx02_s3 Action Initialization

   A newly introduced class, ActionInitialization,
   instantiates and registers to Geant4 kernel all user action classes
   which are defined thread-local and a run action class
   which is defined both thread-local and global.

   The thread-local action classes are defined in
     ActionInitialization::Build()
   and  the global run action class is defined in
     ActionInitialization::BuildForMaster().
   Note that ActionInitialization::Build() is also used to
   instatiate user action clasess in sequential mode.

\section AnaEx02_s4 An event : PrimaryGeneratorAction

 The primary kinematic consists of a single particle which hits the
 calorimeter perpendicular to the input face. The type of the particle
 and its energy are set in the PrimaryGeneratorAction class, and can
 be changed via the G4 build-in commands of ParticleGun class.


\section AnaEx02_s5 Histograms

 To produce histograms, ROOT system must be installed

 AnaEx02 can produce 4 histograms :

  - EAbs : total energy deposit in absorber per event
  - EGap : total energy deposit in gap per event
  - LAbs : total track length of charged particles in absorber per event
  - LGap : total track length of charged particles in gap per event

 And 2 Ntuples :
 - Ntuple1:
   - one row per event : EnergyAbs EnergyGap
 - Ntuple2:
   - one row per event : TrackLAbs TrackLGap

 These histos and ntuples are booked in HistoManager and filled from
 EventAction.

 One can control the name of the histograms file :
 - default name     : AnaEx02
 Format : root

 See HistoManager constructor

\section AnaEx02_s6 How to build

 An additional step is needed when building the example with GNUmake
 due to using the extra shared directory:
\verbatim
% cd path_to_AnaEx02/AnaEx02
% gmake setup
% gmake
\endverbatim

 This will copy the files from shared in the example include and src;
 to remove these files:
\verbatim
% gmake clean_setup
\endverbatim

\section AnaEx02_s8 HOW TO RUN

- Execute AnaEx02 in the 'interactive mode' with visualization
\verbatim
% ./AnaEx02
and type in the commands from run.mac line by line:
Idle> /control/verbose 2
Idle> /tracking/verbose 1
Idle> /run/beamOn 10
Idle> ...
Idle> exit
\endverbatim
      or
\verbatim
Idle> /control/execute run.mac
....
Idle> exit
\endverbatim

- Execute AnaEx02 in the 'batch' mode from macro files
  (without visualization)
\verbatim
% ./AnaEx02 run.mac
% ./AnaEx02 run.mac > run.out
\endverbatim

The AnaEx02.in macro is used in Geant4 testing.

*/
