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Lippincott, Hugh

Publications and source records attributed to Lippincott, Hugh.

Basic Research Needs for High Energy Physics Detector Research & Development: Report of the Office of Science Workshop on Basic Research Needs for HEP Detector Research and Development: December 11-14, 2019

Transformative discovery in science is driven by innovation in technology. Our boldest undertakings in particle physics have at their foundation precision instrumentation. To reveal the profound connections underlying everything we see from the smallest scales to the largest distances in the Universe, to understand its fundamental constituents, and to reveal what is still unknown, we must invent, develop, and deploy advanced instrumentation. Investments in High Energy Physics (HEP) enabled by instrumentation have been richly rewarded with discoveries of the tiny masses of the neutrinos, the origin of mass itself: the enigmatic Higgs boson, and the surprising accelerating expansion of the Universe. What we have learned is remarkable, unexpected, exciting and mysterious; raising many new questions waiting to be answered. The quest to answer them drives innovation that improves the nation's health, wealth, and security, inspiring the public and drawing young people to science. Excellence and innovation come most effectively from diverse teams of people. Success, therefore, depends critically on attracting, engaging, and supporting a diverse cadre of young people to the field, and ensuring an inclusive environment at all levels. The program laid out in the 2014 Particle Physics Projects Prioritization Panel (P5) report "Building for Discovery - A Strategic Plan for U.S. Particle Physics in a Global Context" guides current and near future experiments to exploit these and other discoveries, and the instrumentation innovation they require, to push the frontiers of science into new territory. To explore this territory HEP will soon embark on planning the next generation of experiments. Realizing these experiments will require giant leaps in capabilities beyond the instrumentation of today. Accordingly, now is a pivotal moment to invest in the accelerated development of cost-effective instrumentation with greatly improved sensitivity and performance that will make measurable the unmeasurable, enabling a tool-driven revolution to open the door to future discoveries. Historic scientific opportunities await us, enabled by executing the instrumentation research plan outlined here.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

Analyzing Gas Diffusion in LXe-TPCs for Upcoming Hydrogen Doping Studies [Poster]

Liquid xenon time projection chambers (LXe-TPCs) currently lead the direct-detection search for dark matter (DM) in the form of weakly interacting massive particles (WIMPs). However, sensitivity is currently limited to DM with masses above 5 GeV/c². Hydrogen doping in LXe-TPCs would allow for better kinematic matching between light DM particles and target nuclei, expanding sensitivity to DM masses down to 200 MeV/c². Additionally, this method would introduce sensitivity to spindependent DM. So far, no major experiments have explored this parameter space. Plans are underway to dope an existing small-scale LXe-TPC (XELDA) with H₂ to study behavior and mixing properties in LXe. This will include measuring the Henry coefficient and characterizing the charge-to-light spectrum of H₂ recoils in LXe. Prior to this, it is important to determine an expected time scale of H₂ diffusion and saturation in our TPC.

43 PARTICLE ACCELERATORS↗

PICO Results and Future Plans

• PICO bubble chambers at the 40 liter/50 kg scale can be made background-free • PICO setting world-leading constraints on spin-dependent WIMP proton coupling • Moving on to the next phase of the program

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

Inner-Shell Electron Recoil Discrimination in Xenon

$\bullet$ Dark matter searches using time projection chambers (TPCs) rely on the ability to distinguish between nuclear and electron interactions $\bullet$ Xenon TPCs are specifically searching for a low energy nuclear recoil ( < 30 keV ) signal $\bullet$ To do this, these interactions must be discernable from the electron recoil background

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗