n_passed is too small

Asked by Jui-Lin Kuo on 2019-09-11


When I simulate some longer target-detector distance experiments (e.g. DUNE) with certain models, it happens that the number of dark matter accepted by detector is not enough to start the simulation of the interaction part, and the code reports "Exception : Error: numbers of events entering the detector too small!".
It might be due to the model I used does not produce dark matter flux focusing on the beam axis.

I've tried several possibilities to increase n_passed and I found only increasing nevents (the requested unweight event in production) can effectively increase n_passed.
In the end, I tried setting the nevents to be 1M which seems to be the maximum value allowed by the code but the n_passed is still too small.
I'm wondering is there any other possible ways except increasing nevents to have enough n_passed for successfully performing the simulation, and still get the correct estimation of number of final signal events.

Many thanks,

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