Hello Pelle,

If you are reconstructing everything from a SLiC file, you need to space out the events because each one contains an A' event and will produce weird pile-up otherwise. I usually insert around 150 empty events between each real event to ensure that the hits and clusters (which are displaced by around 60ish events from the source) do not overlap at all. You can do this with the command:

java -cp $HPS_JAVA org.hps.users.meeg.FilterMCBunches $INPUT $OUTPUT -e150 -a

You should definitely get better acceptance that that as well; I got somewhere between 15% - 20% acceptance for 40 MeV (I don't have the exact value on hand).

Note also that there are (or at least were last I checked) differences in how the Monte Carlo simulation is stored versus the EvIO. In the EvIO data, all the hits and clusters for an event are stored in the same event, but in Monte Carlo readout, they are spaced across several events with each event representing 2 ns of time. As such, some drivers that work for EvIO readout do not for the Monte Carlo (this mainly affects clustering). Sho can correct me if I am misrepresenting something here.

- Kyle

On Mon, May 25, 2015 at 6:08 PM, Hansson Adrian, Per Ola <[log in to unmask]> wrote:

Just realized, how is the bunch spacing simulated in the readout step? I suppose I need to add some amount of “time” between the events or do a “NoPileUp” simulation...

/Pelle

On May 25, 2015, at 3:04 PM, Hansson Adrian, Per Ola <[log in to unmask]> wrote:

Hi,

Have some issues getting the MC simulation to run.

I’m running readout and recon over some 1.1GeV 40MeV A' MC files locally with the trunk. Slic file is here:

/nfs/slac/g/hps3/users/phansson/ap1.1gev40mevall_1_200ux40u_beamspot_gammactau_0cm_30mrad_SLIC-v04-00-00_Geant4-v10-00-02_QGSP_BERT_HPS-EngRun2015-Nominal-v1.slcio

I’m using Nominal-v1 detector and I simulate readout with:

java -jar target/hps-distribution-3.3.1-SNAPSHOT-bin.jar ../kepler2/hps-java/steering-files/src/main/resources/org/hps/steering/readout/EngineeringRun2015TrigPairs1.lcsim -Ddetector=HPS-EngRun2015-Nominal-v1 -Drun=2000

I see 245 accepted events out of 10k events which is much lower than I would naively expect?

I then run recon with:

java -jar target/hps-distribution-3.3.1-SNAPSHOT-bin.jar ../kepler2/hps-java/steering-files/src/main/resources/org/hps/steering/recon/EngineeringRun2015FullRecon.lcsim -DoutputFile=outfiles/ap1.1gev40mevall_1_200ux40u_beamspot_gammactau_0cm_30mrad_SLIC-v04-00-00_Geant4-v10-00-02_QGSP_BERT_HPS-EngRun2015-Nominal-v1-recon -i outfiles/ap1.1gev40mevall_1_200ux40u_beamspot_gammactau_0cm_30mrad_SLIC-v04-00-00_Geant4-v10-00-02_QGSP_BERT_HPS-EngRun2015-Nominal-v1-readout.slcio

And I basically get to the 2nd event and then it just hangs there for 5-10mins.

Are these the right steps with the latest and greatest sw? Any ideas?

/pelle

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