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Bug #25587

Can't generate events with no neutrino interactions with GENIEGen

Added by Gianluca Petrillo about 2 months ago. Updated about 2 months ago.

Status:
Assigned
Priority:
Normal
Category:
Simulation
Target version:
-
Start date:
03/03/2021
Due date:
% Done:

0%

Estimated time:
Occurs In:
Experiment:
ICARUS
Co-Assignees:
Duration:

Description

I am not able to obtain events with no neutrino interaction from GENIEGen.
This is relevant when generating a "realistic" beam+background sample.

As an example, the configuration simulation_genie_background_icarus_bnbJan2020_300us.fcl (icaruscode v09_17_01) should, in my intention, produce less than one neutrino interaction every 100 events: at least, I thought it was enough to set no fixed interaction number per event (EventsPerSpill: 0), a reasonable amount of protons on target per spill (POTPerSpill: 2.8e12) and the instruction to keep events with no interactions (PassEmptySpills: true).

This request is in between "support" and "bug". It may be that I haven't figured out the right configuration to make magics happen. But given some e-mail exchange with Robert Hatcher and some step-by-step execution of GENIEhelper code, I am starting with the latter.
Among the things we have tries it was to increase POTPerSpill at ridiculous levels, and likewise reducing it to puny levels. The results were a relevant pile up in the first case, and one event per interaction in the second one. Also, I am pretty convinced that the issue is deeper, in evgb::GENIEHelper rather than GENIEGen.

Steps to reproduce:

source /cvmfs/icarus.opensciencegrid.org/products/icarus/setup_icarus.sh
setup icaruscode v09_17_01 -q e19:debug
lar -c simulation_genie_background_icarus_bnbJan2020_300us.fcl -n 10

on a ICARUS GPVM or anywhere where /pnfs/icarus/persistent and /cvmfs/icarus.opensciencegrid.org are accessible (override to physics.simulate: [ "generator" ] to run only GENIEGen).

History

#1 Updated by Kyle Knoepfel about 2 months ago

  • Assignee set to Robert Hatcher
  • Status changed from New to Assigned

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