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DTSTART;TZID=America/Los_Angeles:20210115T100000
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DTSTAMP:20260429T053330
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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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DTSTART;TZID=America/Los_Angeles:20210115T120000
DTEND;TZID=America/Los_Angeles:20210115T130000
DTSTAMP:20260429T053330
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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