Muon acceptance for LAr+KLOE+STT and LAr+dipole+HPGPTC Chris Marshall, LBNL Justo Martin-Albo, Jose Palomino, Mike Kordosky 21 February, 2018
Recall: last week ● Geometry is ArgonCube + KLOE + STT or ArgonCube + dipole + HPGTPC, created with duneggd by Jose Palomino ● GENIE events in ArgonCube simulated with Geant4 using edep-sim, files produced by Justo Martin-Albo ● Analysis of muon acceptance for events in ArgonCube fiducial volume 2 Chris Marshall
Caveat: old ArgonCube geometry Ar active volume 4x2x5m (optimized is 4x3x5m) 25t FV has 50cm Downstream of buffer around LAr is 60cm edges, and 1.5m polycarbonate downstream (ρ=1.2) and 40cm steel (ρ=8) total 394 g/cm 3 , updated design is ~20 3 Chris Marshall
Updated geometry ● Geometry updated by Jose Palomino ● Steel removed ● Polycarbonate density changed to that of foam ● Downstream material now essentially negligible for muon stopping, as is expected with design like the one proposed by Alan Bross ● Active height increased to 3m ● Bug fix in magnetic field 4 Chris Marshall
ArgonCube + HPGTPC in dipole 5 Chris Marshall
KLOE magnet + ArCube side view ν ArgonCube South Dakota sky STT 6 Chris Marshall
Muon fate ● Stops in LAr ● Exits sides (left/right) ● Exits top/bottom ● Stops in downstream LAr passive material ● Stops in magnet passive material ● Enters magnetized tracker (STT/HPGTPC) ● Other (exits LAr downstream but misses tracker) 7 Chris Marshall
Muon stopping point (side view) KLOE+STT ● Not shown ● Active LAr contained ● Side-exiting ● STT-matched ● Most muons stop in KLOE magnet ● Remaining caveat: muons stopping in KLOE calorimeter are not considered separately, but should be 8 Chris Marshall
Muon stopping point (side view) dipole+HPGTPC ● Not shown ● Active LAr contained ● Side-exiting ● TPC-matched ● Most muons that exit the LAr downstream end stop in dipole magnet 9 Chris Marshall
Neutrino energy and elasticity ● Will show acceptance for various scenarios in this space ● ν μ CC only ● X axis is neutrino energy ● Y axis is E μ /E ν , fraction of energy going to the muon 10 Chris Marshall
Muon kinematics ● New this week: also have plots in terms of muon kinematics ● Kinetic energy and angle 11 Chris Marshall
Acceptance ● ν μ CC events originating in 3x2x3m LAr F.V. with 50cm around edges and upstream, and 1.5m downstream ● Rate is sufficiently high that statistics will be plentiful even with relatively low (few percent) acceptance ● But acceptance differences between ND and FD will be corrected with a model 12 Chris Marshall
LAr hadronic containment ● Improved from last week due to active height increase to 3m 13 Chris Marshall
LAr-contained muon ● Bottom-left corner is lower muon energy 14 Chris Marshall
LAr-contained muon ● As expected, only low-energy muons are contained ● Cutoff is about 1 GeV ~ 5m at 2 MeV/cm 15 Chris Marshall
Tracker-matched track KLOE+STT Dipole+HPGTPC ● Issue from last week has been fixed – tracker acceptance at high energy is higher for Dipole/TPC ● Acceptance in tracker changes 16 Chris Marshall
Tracker-matched track KLOE+STT Dipole+HPGTPC ● As expected, tracker is high-energy, forward muons ● Minimum kinetic energy ~1.5 GeV for KLOE and ~1 GeV for dipole 17 Chris Marshall
Contained OR tracker KLOE+STT Dipole+HPGTPC ● Acceptance gap around focusing peak in both cases, smaller for dipole case 18 Chris Marshall
Contained OR tracker KLOE+STT Dipole+HPGTPC ● Acceptance dip for ~1 GeV, forward muons, which are too energetic to stop in LAr but not energetic enough to penetrate KLOE 19 Chris Marshall
Contained OR tracker OR sides KLOE+STT Dipole+HPGTPC ● Adding side detectors fills in gap somewhat ● Still changing acceptance near peak 20 Chris Marshall
Contained OR tracker OR sides KLOE+STT Dipole+HPGTPC ● Adding side detectors fills in gap somewhat ● Still changing acceptance around 1 GeV 21 Chris Marshall
Contained OR tracker OR sides OR bottom KLOE+STT Dipole+HPGTPC ● Top/bottom detectors are more difficult than sides and are considered separately ● Includes top, but most muons exit bottom due to beam angle 22 Chris Marshall
Contained OR tracker OR sides OR bottom KLOE+STT Dipole+HPGTPC ● Acceptance still changes rapidly as a function of muon energy around 1 GeV for very forward events 23 Chris Marshall
Magnet stoppers KLOE+STT Dipole+HPGTPC ● Acceptance still changes rapidly as a function of muon energy around 1 GeV for very forward events 24 Chris Marshall
Magnet stoppers KLOE+STT Dipole+HPGTPC ● Higher-energy events in KLOE plot could be recovered with KLOE ECAL 25 Chris Marshall
KLOE muon endpoints T μ > 1.5 GeV T μ < 1.5 GeV ● Muons > 1.5 GeV frequently go into the ECAL, but muons < 1.5 GeV stop in the yoke 26 Chris Marshall
1D acceptance by muon fate ● Acceptance by detector where muon stops ● Magnet is magenta, peaks at 35% of all CC events in KLOE, right near oscillation maximum ● Dipole peaks lower and at ~18% of CC events 27 Chris Marshall
1D acceptance by muon fate ● KLOE stops ~50% for muons at 1-2 GeV ● 1.5-2 GeV many stop in the ECAL, but 1-1.5 GeV are stopping in magnet ● Dipole still has some shape in acceptance around 1 GeV but much better 28 Chris Marshall
Conclusions ● Muons will stop in heavy stuff 29 Chris Marshall
Plot dumps ● zip file contains many additional plots for both detectors ● Efficiencies in 2D for each muon stopping volume 30 Chris Marshall
Recommend
More recommend
