Abstract
The measurements of proton–nucleus scattering and high resolution neutrino–nucleus interaction imaging are key in reducing neutrino oscillation systematic uncertainties in future experiments. A High Pressure Time Projection Chamber (HPTPC) prototype has been constructed and operated at the Royal Holloway University of London and CERN as a first step in the development of a HPTPC that is capable of performing these measurements as part of a future long-baseline neutrino oscillation experiment, such as the Deep Underground Neutrino Experiment. In this paper, we describe the design and operation of the prototype HPTPC with an argon based gas mixture. We report on the successful hybrid charge and optical readout using four CCD cameras of signals from 241Am sources.
Highlights
High Pressure Time Projection Chambers (HPTPCs) are an area of growing international interest
The total photon transmission of the system is the second term in brackets, which depends on the transmittance of the lens (Tlens ), the pressure vessel window (Twindow ), and the cathode (Tcathode ) and anode meshes (Tanode ) through which the CCD views the amplification region, which is averaged over the scintillation emission spectrum
Hadronic interactions as particles that are produced in neutrino interactions exit the nucleus and obfuscate the secondary particle multiplicity and kinematics, which causes event migrations between data samples and introduces biases in neutrino event reconstruction
Summary
High Pressure Time Projection Chambers (HPTPCs) are an area of growing international interest. The proton multiplicity and momentum distributions for neutrino charged current interactions on argon that are calculated by the neutrino interaction Monte Carlo generators NEUT [3] and GENIE [4] are highly discrepant in the fraction of events with few ejected protons, and at low proton momentum, below 250 MeV/c [5]. This is below the proton detection threshold in water Cherenkov detectors (1100 MeV/c), and it is below that of liquid argon TPCs, approximately 400 MeV/c [6].
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