With the last version set that was compile with G4 version 10.04 version_5.21.0.xml I was able to throw single optical photons down the length of a DIRC bar and get consistent propagation times to the DIRC PMT plane as seen in t variable for the two events listed below from hd_dump -DDDIRCTruthPmtHit
================================================================
Event: 24
DDIRCTruthPmtHit:
x: y: z: t: t_fixed: E: ch: key_bar: path: refl: bbrefl:
---------------------------------------------------------------------------------------
-330.438 -23.947 547.956 10.007 9.816 0.000 5895 -999 930 2 0
================================================================
Event: 25
DDIRCTruthPmtHit:
x: y: z: t: t_fixed: E: ch: key_bar: path: refl: bbrefl:
---------------------------------------------------------------------------------------
-330.546 -24.101 548.076 10.006 9.816 0.000 5895 -999 930 2 0
However, for the version sets compiled with G4 version 10.07 e.g. version_7.2.0.xml the same particle gun of single optical photons returns bimodal arrival time t with a difference of ~1 ns (9.714 vs 8.774 ns) at the same DIRC PMT as seen in the events listed below using the same hd_dump command
================================================================
Event: 27
14:45:47.905 [info] DDIRCTruthPmtHit:
14:45:47.905 [info] x: y: z: t: t_fixed: E: ch: key_bar: path: refl: bbrefl:
14:45:47.905 [info] --------------------------------------------------------------------------------------
14:45:47.905 [info] -330.554 -25.273 548.084 9.714 9.815 0.000 5952 -999 930 2 0
14:45:47.905 [info]
================================================================
Event: 28
================================================================
Event: 29
14:45:56.222 [info] DDIRCTruthPmtHit:
14:45:56.222 [info] x: y: z: t: t_fixed: E: ch: key_bar: path: refl: bbrefl:
14:45:56.222 [info] --------------------------------------------------------------------------------------
14:45:56.222 [info] -330.582 -25.177 548.116 8.774 9.815 0.000 5952 -999 930 2 0
14:45:56.222 [info]
It seems that the propagation time is not being properly computed with the new G4 version. This has hints of what we observed in previous issues #65 where there was a fix required for the previous G4 version 10.04. Is it possible there is another fix required for the new G4 version 10.07? And more generally, is there a way to isolate ourselves from these kinds of issues in future versions?
You can reproduce these outputs by sourcing the scripts found in /work/halld2/jrsteven/forRichard/DIRCPropTimeBug/12.23.25/ for the two version sets
run_version_5.21.0.csh
run_version_7.2.0.csh
With the last version set that was compile with G4 version 10.04 version_5.21.0.xml I was able to throw single optical photons down the length of a DIRC bar and get consistent propagation times to the DIRC PMT plane as seen in
tvariable for the two events listed below fromhd_dump -DDDIRCTruthPmtHitHowever, for the version sets compiled with G4 version 10.07 e.g. version_7.2.0.xml the same particle gun of single optical photons returns bimodal arrival time
twith a difference of ~1 ns (9.714 vs 8.774 ns) at the same DIRC PMT as seen in the events listed below using the samehd_dumpcommandIt seems that the propagation time is not being properly computed with the new G4 version. This has hints of what we observed in previous issues #65 where there was a fix required for the previous G4 version 10.04. Is it possible there is another fix required for the new G4 version 10.07? And more generally, is there a way to isolate ourselves from these kinds of issues in future versions?
You can reproduce these outputs by sourcing the scripts found in
/work/halld2/jrsteven/forRichard/DIRCPropTimeBug/12.23.25/for the two version setsrun_version_5.21.0.cshrun_version_7.2.0.csh