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DTSTART:20210314T100000
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DTSTART;TZID=America/Los_Angeles:20210108T120000
DTEND;TZID=America/Los_Angeles:20210108T130000
DTSTAMP:20260429T042945
CREATED:20201218T185920Z
LAST-MODIFIED:20201218T185920Z
UID:939-1610107200-1610110800@inpa.lbl.gov
SUMMARY:VIRTUAL INPA SEMINAR | Kelly Stifter (Stanford)
DESCRIPTION:Speaker: Kelly Stifter (Stanford University) \nTitle: The LZ Dark Matter Experiment: From Detector Development to First Physics \nAbstract: \nLZ is a next generation dark matter search designed to significantly extend our sensitivity to WIMP dark matter candidates. At the core of the LZ experiment is a dual-phase xenon time projection chamber (TPC) with a 7 ton active mass. The detector has been assembled at the Sanford Underground Research Facility (SURF) in Lead\, South Dakota and is now in the commissioning phase. After 1000 days of live time\, LZ will achieve a sensitivity of about 1.4 x 10-48 cm2 at 40 GeV/c2 WIMP mass\, improving on previous results by over an order of magnitude. In this talk\, I will give an overview of the development\, construction\, and current commissioning status of the experiment\, focusing in particular on the liquid xenon detector at the core of LZ. I will highlight the design and implementation of key features that drive the sensitivity of the experiment\, including scintillation and ionization detection thresholds and control of backgrounds.\n\n\nJoin Zoom Meeting https://lbnl.zoom.us/j/93293950850?pwd=TmdTUEt1cjEyREtPbHM1U25nNzJNQT09 \nMeeting ID: 932 9395 0850 \nPasscode: 489069
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-kelly-stifter-stanford/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210115T100000
DTEND;TZID=America/Los_Angeles:20210115T110000
DTSTAMP:20260429T042945
CREATED:20210110T123206Z
LAST-MODIFIED:20210110T123206Z
UID:947-1610704800-1610708400@inpa.lbl.gov
SUMMARY:Virtual INPA SEMINAR| Nguyen Phan (LANL)
DESCRIPTION:Speaker: Nguyen Phan (Los Alamos National Laboratory)  \nTitle: “Understanding Electrical Breakdown in Liquid Helium through Analysis of the Empirical Breakdown Field Distributions” \nAbstract: \nMany present and future large-scale detectors in nuclear\, particle\, and astroparticle physics experiments will employ very high voltages and/or high electric fields inside a noble liquid detection medium.  However\, electrical breakdown in these dielectric materials is still poorly understood and may pose a challenge to the design and operation of such experiments.  The neutron electric dipole moment (nEDM) experiment currently being developed to be mounted at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory will perform its measurements in superfluid helium with a target field of 75 kV/cm.  Vital to achieving such a high field at large-scale is a better understanding of the breakdown phenomenon.  To that end\, we have collected data on the distribution of the breakdown voltages for small stainless steel electrodes with different surface polishes immersed in liquid helium\, at various temperature and pressures\, with the goal of providing guidance on the design of the high voltage system for the nEDM experiment at SNS\, but also with potential application to other noble liquid experiments.  In this talk\, we will show how a statistical analysis of our data can be used to determine the electrode surface area scaling of the breakdown field\, a behavior that is of central importance to the design of large-scale detectors employing high voltage.  We will show that the dependence of the probability of breakdown on the field strength\, extracted from the data\, closely resembles that of the field emission\, giving a strong indication that the initial process involves the field emission from the cathode.  A method to optimize the design of arbitrary-shaped electrodes to reduce the risk of breakdown is also presented.  Most importantly\, the methods proposed in this work can be extended to other noble liquids to explore the behavior of electrical breakdown in those media. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/93758070002?pwd=OFIycS93bDBNTTY0SEsrNDcwdUZHQT09 \nMeeting ID: 937 5807 0002 \nPasscode: 876187
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-nguyen-phan-lanl/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210115T120000
DTEND;TZID=America/Los_Angeles:20210115T130000
DTSTAMP:20260429T042945
CREATED:20210104T215609Z
LAST-MODIFIED:20210104T215609Z
UID:942-1610712000-1610715600@inpa.lbl.gov
SUMMARY:VIRTUAL INPA SEMINAR | Yifan Chen (Univ. of Bern)
DESCRIPTION:Speaker: Yifan Chen (University of Bern\, Switzerland) \nTitle: Just A Little Kick: Low-Energy Transfer Muon-Neutrino νμ Charged-Current Interactions on Argon \nAbstract: \nAccelerator neutrino oscillation experiments provide a sensitive way to approach a few major open questions in neutrino physics. To achieve precision neutrino oscillation measurements\, we need a better understanding of key aspects of the experiments\, such as the detection technologies and neutrino interactions. In this talk\, I will focus on low-energy transfer muon-neutrino charged-current interactions using the MicroBooNE detector\, where the neutrinos give just a little kick to the target. Neutrino interactions are poorly understood at low-energy transfers. A number of experiments operating in few-GeV accelerator neutrino beams have found discrepancies between their measured data and model predictions in this region. We explore this region of phase space with Argon for the first time\, which will be valuable for constraining uncertainties for future accelerator-based neutrino oscillation experiments. In particular\, the short baseline neutrino program (SBN) and deep underground neutrino experiment (DUNE)\, both use Argon as their target material. In addition\, MicroBooNE employs the same liquid argon time projection chamber detector technology as SBN and DUNE\, which makes the detector physics studies carried out in this analysis an additional useful input for future neutrino oscillation experiments.\n\n\n\nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/96968189658?pwd=MEMzZC9XMmpmMTdVZ3o5MGJybTg3UT09 \nMeeting ID: 969 6818 9658 \nPasscode: 816559
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-yifan-chen-univ-of-bern/
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210122T120000
DTEND;TZID=America/Los_Angeles:20210122T130000
DTSTAMP:20260429T042945
CREATED:20210115T211646Z
LAST-MODIFIED:20210115T211646Z
UID:951-1611316800-1611320400@inpa.lbl.gov
SUMMARY:VIRTUAL INPA SEMINAR | Tucker Elleflot (LBNL)
DESCRIPTION:Speaker: Tucker Elleflot (Lawrence Berkeley National Laboratory) \nTitle: Multiplexed Readout of Transition Edge Sensors for CMB Polarization Experiments \nAbstract: \nThe polarization of the Cosmic Microwave Background (CMB) provides a valuable means to study the very early universe and high energy physics beyond the standard model. Remarkable experimental progress has been made on this front in the past decade. Modern experiments employ as many as O(10\,000) Transition Edge Sensor (TES) bolometers and highly multiplexed readout systems\, all operating below the photon noise level. My research has focused on the development of the sensors and multiplexing systems for CMB experiments. I will first describe my contributions to TES characterization for the POLARBEAR-2 experiment\, emphasizing a specific systematic effect created by the multiplexing system. Next I will discuss my current research: taking the lessons learned from POLARBEAR-2 to develop an even higher performance multiplexing system for the next generation of CMB experiments such as CMB-S4 and LiteBIRD. I will end by noting potential applications of this work to dark matter direct detection experiments using TES calorimeters. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/92456461157?pwd=dDM1YzBkVlIzS0pJTS9QUVFSK3pzQT09\nMeeting ID: 924 5646 1157\nPasscode: 637320
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-tucker-elleflot-lbnl/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20210129T120000
DTEND;TZID=America/Los_Angeles:20210129T130000
DTSTAMP:20260429T042945
CREATED:20210124T002424Z
LAST-MODIFIED:20210124T002424Z
UID:954-1611921600-1611925200@inpa.lbl.gov
SUMMARY:VIRTUAL INPA SEMINAR | Joseph DeRose (UC Santa Cruz)
DESCRIPTION:Speaker: VIRTUAL INPA SEMINAR | Joseph DeRose (UC Santa Cruz) \nTitle: “Models of the Non-Linear Universe for Precision Cosmology” \nAbstract: \nImaging and redshift surveys of galaxies and high resolution observations of the CMB promise to shed light on the physical nature of dark matter and dark energy in the coming decade. One of the main factors limiting the precision and accuracy of cosmological constraints coming from these measurements will be our understanding of how non-linear structure forms in our universe. In this talk I will present a roadmap for leveraging cosmological simulations to improve this understanding. First\, I will discuss recent progress on combining perturbative models of structure formation with N-body simulations in order to obtain highly optimized predictions for real-space galaxy clustering and weak lensing\, and describe how similar models might be used to confront a variety of observations. I will then show how realistic models of galaxy formation and evolution combined with contemporary machine learning techniques can be used as robustness tests for complex cosmological analyses\, with case studies from the Dark Energy Survey and the Dark Energy Spectroscopic Instrument. \nJoin Zoom Meeting \nhttps://lbnl.zoom.us/j/96158079387?pwd=aXY5QStNZUpUbUpUYUpTZm5SblYyZz09 \nMeeting ID: 961 5807 9387 \nPasscode: 363617
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-joseph-derose-uc-santa-cruz/
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