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3D track reconstruction of low-energy electrons in the MIGDAL low pressure optical time projection chamber

https://doi.org/10.1088/1748-0221/18/07/C07013

Tilly, E. ; Handley, M. ( July 2023 , Journal of Instrumentation)

Abstract We demonstrate three-dimensional track reconstruction of electrons in a low pressure (50 Torr) optical TPC consisting of two glass GEMs with an ITO strip readout in CF 4 and CF 4 /Ar mixtures. The reconstructed tracks show a variety of event topologies, including short tracks from photoelectrons induced by 55 Fe 5.9 keV X-rays and long tracks from gamma ray interactions and beta decays. Algorithms for event identification and track ridge detection are discussed as well as multiple methods for integrating information from the camera image and ITO waveforms with the goal of full 3D reconstruction of the track.
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Free, publicly-accessible full text available July 1, 2024
Interlaboratory Calibration for Laser Ablation of Ice Cores

Gadrani, L. ; Kurbatov, A. V. ; Korotkikh, E.V. ; Bohleber, P. ; Mayewski, P. A. ; Handley, M. ( April 2023 , EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023)

We report interlaboratory comparisons of a methodology to measure and calculate concentrations of impurities in ice core samples using the Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) system developed at the W. M. Keck Laser Ice Facility at the Climate Change Institute, University of Maine (UMaine). Here, we will summarize results of measured artificial samples with known levels of Ca, Al, Fe, Mg, Na, Cu, Pb. We adapted a method for LA-ICP-MS analysis of the frozen standard that was developed in the laboratory at Ca’ Foscari University of Venice, and we tested its applicability to the UMaine system. This work will help to measure and interpret very old and highly compressed ice core records from the Allan Hills Blue Ice Area, Antarctica, sampled with different analytical tools.
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The FIREBIRD-II CubeSat mission: Focused investigations of relativistic electron burst intensity, range, and dynamics

https://doi.org/10.1063/1.5137905

Johnson, A. T. ; Shumko, M. ; Griffith, B. ; Klumpar, D. M. ; Sample, J. ; Springer, L. ; Leh, N. ; Spence, H. E. ; Smith, S. ; Crew, A. ; et al ( March 2020 , Review of Scientific Instruments)
The 1200 year composite ice core record of Aleutian Low intensification: Aleutian Low Ice Core Record

https://doi.org/10.1002/2017GL073697

Osterberg, E. C. ; Winski, D. A. ; Kreutz, K. J. ; Wake, C. P. ; Ferris, D. G. ; Campbell, S. ; Introne, D. ; Handley, M. ; Birkel, S. ( July 2017 , Geophysical Research Letters)