LArSoft and Low Energy Physics Jason D. Stock Juergen Reichenbacher April 26, 2019 You Inst Logo
Alphas and Protons as Simulated in LArSoft (Low Energy Ion Physics Issues) Simulated alphas are making less charge than simulated protons of equal kinetic energy. Fewer simulated alphas are observed than simulated gammas of the same kintetic energy. You Inst Logo 2 Jason Stock | DUNE & SDSMT
Low Energy Hadron Physics Issues -------- EEEE ------- G4Exception-START -------- EEEE ------- *** G4Exception : had005 issued by : G4HadronElasticProcess::PostStepDoIt In /scratch/workspace/nu-release-build/v2_22_02/s67- e17/prof/build/geant4/v4_10_3_p03c/source/geant4.10.03.p03/source/processes/hadronic/management/ src/G4EnergyRangeManager.cc, line 129: ===> GetHadronicInteraction: No Model found Target element argon Z= 18 A= 40 Unrecoverable error in the method ChooseHadronicInteraction of hadElastic TrackID= 22 ParentID= 1 neutron Ekin(GeV)= 0.0254441; direction= (0.947898,0.0114053,0.31837) Position(mm)= (-1351.77,-2953.69,2028.05); material LAr PhysicalVolume <volTPCActiveInner_PV> No HadronicInteractionfound out Thanks to Maria Manrique *** Fatal Exception *** core dump *** -------- EEEE -------- G4Exception-END --------- EEEE ------- You Inst Logo 3 Jason Stock | DUNE & SDSMT
Physics Lists (New Physics List) Standard Physics List SN/ LE Physics List • • Em LowEnergyEm • • FastOptical FastOptical • • SynchrotronAndGN SynchrotronAndGN • • Ion Ion ( IonHP ) • • Hadron NeutronHP ( HadronHP ) • • Decay Decay • • HadronElastic HadronElastic • • Stopping Stopping Thanks to Steve Gardiner (FNAL) • NeutronTrackingCut for helping to impliment IonHP and HadronHP so quickly. You Inst Logo 4 Jason Stock | DUNE & SDSMT
Charge From Tested 5MeV RadioGen particles 5MeV Proton signal provides a clear baseline by which to gauge minimum expected values for Alphas 5MeV Heavy Protons (FourProton) with 4 times the proton mass to approximate alphas Simulated 5MeV Alphas produce almost no charge! You Inst Logo 5 Jason Stock | DUNE & SDSMT
Light From Tested 5MeV RadioGen particles 5MeV Proton signal provides a clear baseline by which to gauge minimum expected values for Alphas 5MeV Heavy Protons (FourProton) with 4 times the proton mass to approximate alphas Simulated 5MeV Alphas produce almost no Light! You Inst Logo 6 Jason Stock | DUNE & SDSMT
FourProton as a Substitute for Alphas Ar39/Kr85 Peak You Inst Logo 7 Jason Stock | DUNE & SDSMT
A Look at Alternative Rn Rquirements (Using FourProton as a stand in for Alpha) Ar39/Kr85 Peak Large background signals can cause issues for SN triggers and the overall data rate. You Inst Logo 8 Jason Stock | DUNE & SDSMT
A Look at Alternative Rn Rquirements (Using FourProton as a stand in for Alpha) Reduction in the high PE signals is important for optical triggering You Inst Logo 9 Jason Stock | DUNE & SDSMT
Radon? • • Radon vs the Ar39 Background Complications of a tighter requirement. - Rn must remain subdominant to the Ar39 Quality control on Ar-39 - Background suply. • Radon as a false trigger for SN Emanation from detector - - Rn must not cause an materials undue number of false SN Diffusion from the FD - triggers cavern into the detector. • Radon and its impact on the data rate. - Rn must not saturate the readout You Inst Logo 10 Jason Stock | DUNE & SDSMT
Summary/Discussion • • All low energy ions are currently Having started with a very misshandled in LArSoft/dunetpc. generous Radon • Workarounds can be found to requirement leaves room avoid using the Ion physics. for a more stringent • requirement. Appropriate Low Energy physics factories have been generated • In all cases, the signal and are being tested right now. from Radon and its • The impact of radon on low daughters are likely to energy triggers could be much produce much brighter larger than previously estimated. signals that we have previously believed. You Inst Logo 11 Jason Stock | DUNE & SDSMT
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