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DDG4 particle gun [message #2381]

Mon, 29 February 2016 22:19

jeans
Messages: 22
Registered: November 2012

Hello,

The isotropic particle gun in DDG4 results in a distribution uniform in theta, while a truly isotropic distribution should be uniform in cos(theta). Flat-in-theta gives a too-large number of events in the forward region. If one is an FCAL expert, the current definition is of course favourable, but for more general studies, a truly isotropic distribution would be more convenient!

(This same behaviour was also present in the Mokka particle gun.)

Would it be possible to change the definition of isotropic (in DD4hep/DDG4/src/Geant4IsotropeGenerator.cpp ), or to add the option of using the "correct" definition?

Cheers,
Daniel.

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[Message index]

		DDG4 particle gun By: jeans on Mon, 29 February 2016 22:19
		Re: DDG4 particle gun By: gaede on Tue, 01 March 2016 01:35
		Re: DDG4 particle gun By: jeans on Tue, 01 March 2016 22:54
		Re: DDG4 particle gun By: sailer on Wed, 02 March 2016 02:48
		Re: DDG4 particle gun By: jeans on Wed, 02 March 2016 20:57
		Re: DDG4 particle gun By: jeans on Wed, 16 March 2016 00:49
		Re: DDG4 particle gun By: sailer on Wed, 16 March 2016 01:21
		Re: DDG4 particle gun By: jeans on Wed, 16 March 2016 01:45
		Re: DDG4 particle gun By: gaede on Wed, 02 March 2016 01:15

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