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| LArIAT | |
|---|---|
| Name | LArIAT |
| Caption | Liquid Argon Time Projection Chamber test beam experiment |
| Location | Fermilab |
| Established | 2015 |
| Type | Particle physics experiment |
LArIAT LArIAT was a liquid argon time projection chamber test-beam experiment at Fermilab designed to study charged-particle interactions in liquid argon for use in neutrino experiments. It operated in the Meson Test Beam Facility at Fermilab and provided prototype validation and calibration data relevant to detectors such as MicroBooNE, SBND, ICARUS, DUNE, and ArgoNeuT. The program connected instrumentation development with physics analysis to inform large-scale neutrino oscillation and short-baseline neutrino anomaly searches.
LArIAT used a refurbished ArgoNeuT cryostat and a time projection chamber to record charged tracks from secondary beams delivered by the Test Beam Facility at Fermilab. The experiment linked technology from MicroBooNE and design goals for DUNE with test-beam programs like CALICE and NA61/SHINE to characterize responses to pions, kaons, muons, and protons. Its program emphasized reconstruction techniques developed in collaboration with groups from University of Chicago, Yale University, Columbia University, and University of Michigan.
The initiative grew from prototype efforts following results from ICARUS and ArgoNeuT and in preparation for proposals such as LBNE and later DUNE. Early planning involved teams affiliated with Fermilab, CERN, Brookhaven National Laboratory, and several university groups. Construction and commissioning phases paralleled developments at BNL and aligned with beamline work at the Meson Test Beam Facility; operations began during an era marked by upgrades to the Main Injector and timelines impacting projects like NOvA and MINERvA.
The detector comprised a single-phase liquid argon time projection chamber inspired by ArgoNeuT and MicroBooNE designs, instrumented with wire planes, photomultiplier tubes, and cold electronics influenced by technology from DUNE prototype programs at CERN and SNOLAB studies. Charge readout employed wire-based induction and collection planes similar to those used in ICARUS, while light detection used wavelength-shifting coatings and PMT arrays akin to systems in MiniBooNE and SNO+ R&D. Cryogenics and purity systems drew on established practice from Fermilab cryogenic programs and consulting with Argonne National Laboratory and Lawrence Berkeley National Laboratory experts.
LArIAT sat in the Meson Test Beam Facility where secondary beams produced by the Main Injector and downstream magnets provided tagged pions, kaons, muons, and protons from momentum-selected optics. Particle identification in the beamline used time-of-flight counters, Cherenkov detectors, and scintillator paddles similar to instrumentation at CERN SPS test beams and the PS facility. External tracking and calorimetry, coordinated with groups from Columbia University and Rutgers University, enabled cross-calibration with experiments like MINERvA and NOvA test setups.
Primary goals included measurement of charged-particle response in liquid argon, development of particle identification (PID) algorithms, and benchmarking of hadronic interaction models used in GENIE, GEANT4, and other simulation toolkits. Results informed reconstruction strategies for neutrino oscillation measurements, background rejection in proton decay searches, and calorimetric energy reconstruction for detectors such as DUNE and SBND. Publications compared data to predictions from GEANT4 physics lists, reported pion absorption and charge-exchange rates relevant to Super-Kamiokande systematics, and improved models used by MicroBooNE and ICARUS collaborations.
Analysis combined wire-plane signal processing, deconvolution algorithms used in MicroBooNE and ArgoNeuT, and optical timing from PMT systems employed in MiniBooNE. Calibration exploited through-going muon samples, stopping proton datasets, and tagged beam particles using techniques developed at Fermilab and adapted from CERN test beam practice. Teams compared reconstruction outputs with simulations from GENIE and GEANT4 and incorporated detector response models used by DUNE proto-collaborations to refine energy scale, dE/dx-based PID, and shower reconstruction.
The collaboration included scientists from national laboratories and universities including Fermilab, Argonne National Laboratory, Brookhaven National Laboratory, Yale University, University of Chicago, Columbia University, University of Michigan, and international partners who had worked on ICARUS and CERN test programs. Operations required coordination with the Fermilab Test Beam Facility schedule, interaction with accelerator teams managing the Main Injector, and data management practices consistent with those used by NOvA and MINERvA. LArIAT results fed into design reviews and technical proposals for downstream projects like DUNE and influenced reconstruction software shared among MicroBooNE, SBND, and ICARUS collaborations.