[en] Development by Group MP-1 of a new magnet-mapping control system for use by the Group MP-8 magnet-mapping section was completed in November 1984. The software runs on a Digital Equipment Corporation (DEC) micro-PDP and uses the fixed disk for data storage. CAMAC operation is supported by a Kinetic Systems 3912 type U single-crate controller and a device driver that was written for this project

[en] Precise calorimetric reconstruction of 5-50 MeV electrons in liquid argon time projection chambers (LArTPCs) will enable the study of astrophysical neutrinos in DUNE and could enhance the physics reach of oscillation analyses. Liquid argon scintillation light has the potential to improve energy reconstruction for low-energy electrons over charge-based measurements alone. Here we demonstrate light-augmented calorimetry for low-energy electrons in a single-phase LArTPC using a sample of Michel electrons from decays of stopping cosmic muons in the LArIAT experiment at Fermilab. In this work, Michel electron energy spectra are reconstructed using both a traditional charge-based approach as well as a more holistic approach that incorporates both charge and light. A maximum-likelihood fitter, using LArIAT's well-tuned simulation, is developed for combining these quantities to achieve optimal energy resolution. A sample of isolated electrons is simulated to better determine the energy resolution expected for astrophysical electron-neutrino charged-current interaction final states. In LArIAT, which has very low wire noise and an average light yield of 18 pe/MeV, an energy resolution of $\mathrm{\sigma <!--\; ??\; -->}/E\simeq <!--\; ???\; -->9.3\mathrm{\%<!--\; \%\; -->}/\sqrt{E}\oplus <!--\; ???\; -->1.3\mathrm{\%<!--\; \%\; -->}$ is achieved. Samples are then generated with varying wire noise levels and light yields to gauge the impact of light-augmented calorimetry in larger LArTPCs. At a charge-readout signal-to-noise of S/N $\simeq <!--\; ???\; -->$ 30, for example, the energy resolution for electrons below 40 MeV is improved by $\approx <!--\; ???\; -->$ 10%, $\approx <!--\; ???\; -->$ 20%, and $\approx <!--\; ???\; -->$ 40% over charge-only calorimetry for average light yields of 10 pe/MeV, 20 pe/MeV, and 100 pe/MeV, respectively.

[en] The LArIAT Experiment aims to calibrate the liquid argon time projection chamber (LArTPC) using a beam of charged particles at the Fermilab Test Beam Facility. It is equipped with a novel scintillation light readout system using PMTs and custom SiPM preamplifier boards to detect light from reflector foils coated with wavelength-shifting TPB. A trigger on delayed secondary flashes of light captures events containing stopping cosmic muons together with the Michel electrons coming from their subsequent decay. This dedicated Michel trigger supplies an abundant sample of low-energy electrons throughout the detector's active volume, providing opportunities to study the combined calorimetric capabilities of the light system and the TPC. Preliminary results using scintillation light to study properties of the Michel electron sample are presented

[en] The MEGA experiment, which searched for the muon- and electron-number violating decay μ⁺→e⁺γ, is described. The spectrometer system, the calibrations, the data taking procedures, the data analysis, and the sensitivity of the experiment are discussed. The most stringent upper limit on the branching ratio, B(μ⁺→e⁺γ)<1.2x10^-11 with 90% confidence, is derived from a likelihood analysis

[en] The data acquisition system for the Large Scintillating Neutrino Detector (LSND) is described. The system collects time and charge information in real time from 1600 photomultiplier tubes and passes the data in intelligent-trigger selected time windows to analysis computers, where events are reconstructed and analyzed as candidates for a variety of neutrino-related physics processes. The system is composed of fourteen VME crates linked to a Silicon Graphics, Inc. ''4D/480'' multiprocessor computer through multiple, parallel Ethernets, and a collection of contemporary high-performance workstations

[en] We report on the status of LAMPF experiment E-1240 to measure the Michel ρ parameter in direct muon decay. This experiment ran in 1993, and the data are currently being analyzed. The expected precision on the ρ parameter is ±0.0008. This result will provide better constraints on new physics, particularly on the charged vector bosons' mixing angle ζ in the manifestly left-right symmetric extension of the Standard Model

[en] The second workshop to discuss the development of liquid argon time projection chambers (LArTPCs) in the United States was held at Fermilab on July 8-9, 2014. The workshop was organized under the auspices of the Coordinating Panel for Advanced Detectors, a body that was initiated by the American Physical Society Division of Particles and Fields. All presentations at the workshop were made in six topical plenary sessions: i) Argon Purity and Cryogenics, ii) TPC and High Voltage, iii) Electronics, Data Acquisition and Triggering, iv) Scintillation Light Detection, v) Calibration and Test Beams, and vi) Software. This document summarizes the current efforts in each of these areas. It primarily focuses on the work in the US, but also highlights work done elsewhere in the world

[en] An experiment is proposed to search concurrently for ν_μ → ν_e and bar ν_μ → bar ν_e oscillations with high sensitivity at LAMPF. The detector consists of a tank with 200 tons of dilute liquid scintillator with 850 10-in. photomultiplier tubes mounted on the inside tank covering 28% of the surface. Both Cerenkov light and scintillation light will be detected. The tank will reside inside the existing E645 veto shield and the experiment will make use of the present A6 beam-stop neutrino source. After two years of data collection, 90% confidence level limits on bar ν_mu(ν_μ) → bar ν_e(ν_e) mixing strengths of 2.7(2.7) x 10^-4 can be obtained for all Δm² > 1 eV². Similarly, for maximal mixing the 90% C.L. limits on Δm² are 1.7(4.0) x 10^-2. This experiment will, therefore, provide the world's best terrestrial limits on ν_μ → ν_e oscillations. Other physics to be obtained includes measurements of the charged current reactions ν_eC → e^-N and ν_μC → μ^-N, of the inelastic neutral current reaction νC → νC* (15.11- MeV γ), and a search for the rare decays π⁰ → ν bar ν and η → ν bar ν

[en] We report on the status of LAMPF experiment E-1240 to measure the Michel ρ parameter in direct muon decay. This experiment ran in 1993, and the data are currently being analyzed. The expected precision on the ρ parameter is ±0.0008. This result will provide better constraints on new physics, particularly on the charged vector bosons close-quote mixing angle ζ in the manifestly left-right symmetric extension of the Standard Model. copyright 1997 American Institute of Physics

[en] The status of the MEGA experiment is described. It is a search for the decay μ → eγ with a branching ratio sensitivity of approximately 10^-13. The observation of this decay would indicate the existence of physics outside the standard model of electroweak interactions. The experiment employs highly modular, fast detectors, state-of-the-art electronics, and a staged trigger with on-line filters. The detectors are contained in a 1.5 T solenoidal field produced by a superconducting magnet. Positrons are confined to the central region and are measured by a set of thin MWPCs. Photons are measured by one of four layers of pair spectrometers in the outer region. Most aspects of the detector design have been validated in engineering runs; data taking will begin in 1990 with most of the electron arm and one pair spectrometer layer installed. 5 refs., 4 figs