[Gate-users] GPS Bremsstrahlung spectra

[S. Saghamanesh]

The bremsstrahlung should be specified in the physics section by "/gate/physics/processes/bremsstrahlung/...". But I guess you mean you want to define a continuous spectrum (bremsstrahlung spectrum) for your source. So you can use of a "User" or "Arb" type of gps energy as below:
/gate/source/mysource/gps/particlegamma
/gate/source/mysource/gps/energytype User
/gate/source/mysource/gps/histname energy
/gate/source/mysource/gps/emin 1.00 keV
/gate/source/mysource/gps/emax 35.00 keV
/gate/source/mysource/gps/histpoint 0.001 0.
/gate/source/mysource/gps/histpoint 0.0015 0.
/gate/source/mysource/gps/histpoint 0.0020 0.2776
...
/gate/source/Xtube/gps/histpoint0.0350  12960

you should go on with completing all your user-defined spectrum histogram. you can refer to Gate benchmarks or examples (CT benchmark) as well as the Gate user guide (section: defining a source/defining energy type).
Good luckSoman 

     On Wednesday, October 15, 2014 4:26 PM, Nada Fakhoury <nfachour at physics.auth.gr> wrote:
   

 
Dear all,

I am quite new at using Gate, so I have many questions, but I will  
trouble you today with just the one.

I am trying to simulate a Linac beam, so as a first step I am trying  
to approach it with the gps commands.
So I am wondering, does Gate support the bremsstrahlung command?

I tried defining it as

/gate/source/mybeam/gps/particle gamma
/gate/source/mybeam/gps/ene/type Brem
/gate/source/mybeam/gps/ene/min 1 eV
/gate/source/mybeam/gps/ene/max 6 MeV

for starters, but I am getting a repeated error saying

*****EXPMIN=0. Choose different E's or Temp
*****EXPMAX=0. Choose different E's or Temp


I tried defining my source as done in the examples and the RT  
benchmark, but I get a dose distribution that seems way off... (  
https://www.dropbox.com/s/hd6da9lhapn5cju/Screenshot%20from%202014-10-11%2017%3A40%3A14.png?dl=0  
)


Thank you in advance,

Nada.




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