|Message: Re: what is track weight???||Not Logged In (login)|
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On Wed, 04 Feb 2015 04:19:37 GMT, LoongDaoo wrote:
> I am studying the extended example GB01 to bias the proton nuclear > reaction cross section in my simulation. And in the > GB01BOptrMultiParticleChangeCrossSection.cc file,there is a line "if ( > track->GetWeight() < 0.05 ) return 0;" in the function > ProposeOccurenceBiasingOperation(). I don't know what is the track > weight, and what is the relation between it and the biasing operation? I > didn't find answers from the user's guide and the source files.
You may wish to read through section 3.7 of the Application Developer's Guide. Biasing assigns a weight (not equal to 1.) to each track, in such a way that making a _weighted_ histogram of a track quantity should result in the same distribution of that quantity as you would get from the unbiased (analogue) simulation. The weight may also be used as part of the biasing process (see "weight window" and "weight roulette" in section 3.7).
When tracks produce secondaries, the track weight is passed on to those secondaries as well.
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