Content
[Functionality][The
AliRun::RunLego(..) Method][Lego Generators]
[Starting Up] [Run]
[Look a the results]
Functionality [Take me back]
Lego plots are generated by tracking so called geantinos through
the Geant3 geometry. These geantinos
do not undergo any interaction with the material but allow to sample
physical quantities step by step.
The most important of these quantities are the density, radiation length
and interaction length. The plots
are represented as 2-dim histograms. The two coordinates of are by
default the phi and theta direction of
the geantino. Other coordinate pairs can, however, be chosen.
The AliRun::RunLego(...) Method [Take me back]
Declaration
void RunLego(
const char *setup="Config.C",
Int_t nc1=60, Float_t c1min=2, Float_t c1max=178,
Int_t nc2=60,Float_t c2min=0,Float_t c2max=360,
Float_t rmin=0, Float_t rmax=430,
Float_t zmax=10000,
AliLegoGenerator* gener=NULL
);
Meaning of the arguments
| setup | Name of configuration file |
| nc1, c1min, c1max | number of bins, lower and upper limit for the first coordinate |
| nc2, c2min, c2max | number of bins, lower and upper limit for the second coordinate |
| rmin, rmax | upper and lower limit of radial coordinate in (x,y)-plane |
| zmax | upper limit for z-coordinate |
| gener | The lego generator used for the run |
If no lego-generator is passed to RunLego
the default generator AliLegoGenerator is used.
Lego
Generators
[Take me back]
| Generator Type | 1st coordinate | 2nd coordinate | Origin of geantino |
| AliLegoGenerator() | theta | phi | (0,0,0) |
| AliLegoGeneratorEta() | phi | eta | (0,0,0) |
| AliLegoGeneratorPhiZ() | z | phi | (0,0,z) theta=90deg |
| AliLegoGeneratorXYZ("x") | y | z | (0,y,z) |
| AliLegoGeneratorXYZ("y") | x | z | (x,0,z) |
| AliLegoGeneratorXYZ("z") | x | y | (x,y,0) |
AliLegiGeneratorXYZ has to be initialized with the name of the
axis ("x", "y" or "z") perpendicular to which the origin of the
geantino as varied. The direction of the geantino will
be parallel to this axis.
Starting Up [Take me back]
Start AliRoot as usual.
| pcandreas% aliroot
Warning in <Add>: class AliClassInfo allready in
Compiled with thread support. CINT/ROOT C/C++ Interpreter version 5.14.50, Sep 2
WELCOME to ALICE root [0]
|
Run [Take me back]
Example for run with default generator.
| root [0] gAlice->RunLego("Config.C", 145, -45., 45, 90,
0, 360, 0, 700 , 1000)
|
Example for run with non default generator.
| root [0] gAlice->RunLego("Config.C", 90, 0, 360, 100, -1,
1, 0, 700 , 1000, new AliLegoGeneratorEta())
|
Look at the results [Take me back]
Start a TBrowser
| root [1] new TBrowser()
|
Select galice.root in the ROOT Files Folder.
Click on one of the histogram icons to display the histogram. Use the Draw Panel from the context menu to select the Lego1 drawing option.
