BEGIN:VCALENDAR VERSION:2.0 PRODID:-//INPA - ECPv6.8.3//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:INPA X-ORIGINAL-URL:https://inpa.lbl.gov X-WR-CALDESC:Events for INPA REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20170312T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20171105T090000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0800 TZOFFSETTO:-0700 TZNAME:PDT DTSTART:20180311T100000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0700 TZOFFSETTO:-0800 TZNAME:PST DTSTART:20181104T090000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180525T080000 DTEND;TZID=America/Los_Angeles:20180525T170000 DTSTAMP:20260405T052213 CREATED:20180525T003827Z LAST-MODIFIED:20180525T003838Z UID:409-1527235200-1527267600@inpa.lbl.gov SUMMARY:No INPA Seminar This Week DESCRIPTION: URL:https://inpa.lbl.gov/event/no-inpa-seminar-this-week/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180518T120000 DTEND;TZID=America/Los_Angeles:20180518T130000 DTSTAMP:20260405T052213 CREATED:20180402T154429Z LAST-MODIFIED:20180426T220952Z UID:381-1526644800-1526648400@inpa.lbl.gov SUMMARY:Alexey Drobizhev (UCB/LBNL) DESCRIPTION: URL:https://inpa.lbl.gov/event/alexey-drobizhev/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180511T120000 DTEND;TZID=America/Los_Angeles:20180511T130000 DTSTAMP:20260405T052213 CREATED:20180426T215632Z LAST-MODIFIED:20180430T171544Z UID:400-1526040000-1526043600@inpa.lbl.gov SUMMARY:Shirley Li (SLAC) - DUNE as the next-generation solar neutrino experiment DESCRIPTION: URL:https://inpa.lbl.gov/event/shirley-li-slac-dune-as-the-next-generation-solar-neutrino-experiment/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180427T120000 DTEND;TZID=America/Los_Angeles:20180427T130000 DTSTAMP:20260405T052213 CREATED:20180314T154654Z LAST-MODIFIED:20180425T170724Z UID:367-1524830400-1524834000@inpa.lbl.gov SUMMARY:Dan Dwyer (LBNL) - Demonstration of a true 3D micro-power sensor for liquid argon time projection chambers DESCRIPTION:Time projection chambers (TPCs) based on the ionization of cryogenic liquids are a prominent tool for neutrino oscillation\, neutrinoless double beta decay\, and dark matter experiments. Over the past two years I have pursued the development of a novel charge readout sensor providing true 3D imaging of particle interactions in large-scale liquid argon TPCs. The sensor must meet stringent requirements on noise (<600 electron)\, power (<100 microwatts per channel)\, and scalability (digital multiplexing of 100\,000 channels per square meter)\, all at cryogenic temperatures. Such a scalable 3D micro-power sensor would enable operation of liquid argon TPCs in high-occupancy environments\, such as the near detector site of the Deep Underground Neutrino Experiment (DUNE). I will present my recent mad dash to a successful demonstration of 3D micro-power imaging of particle tracks in liquid argon\, and discuss what worked and what didn’t work along the way. I will also discuss the potential impact on upcoming neutrino measurements. URL:https://inpa.lbl.gov/event/dan-dwyer-lbnl-tba-dune-upgrade-tpc-readout/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180420T120000 DTEND;TZID=America/Los_Angeles:20180420T130000 DTSTAMP:20260405T052213 CREATED:20180202T161329Z LAST-MODIFIED:20180416T171943Z UID:344-1524225600-1524229200@inpa.lbl.gov SUMMARY:Rebecca Canning (Stanford) - Understanding Active Galactic Nuclei (AGN) in the most massive cosmic laboratories DESCRIPTION:Supermassive Black Holes (SMBHs) lurk in the centers of all massive galaxies\, a fraction of these SMBHs are actively accreting and this can result in powerful outbursts which have important consequences for galaxy formation and evolution. However\, the conditions under which a SMBH becomes active and the manner in which it interacts with its environment are not well understood. Clusters of galaxies offer us wonderful cosmic laboratories in which we can observe these processes. I will discuss what observations of these massive galaxy clusters can tell us about the role of AGN feedback in both maintaining a delicate balance between heating and cooling and in searching for a casual link between SMBHs and galaxy co-evolution and detail the Cluster AGN Topography Survey which is undertaking a census of SMBH activity in massive galaxy clusters. URL:https://inpa.lbl.gov/event/rebecca-canning-stanford/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180417T170000 DTEND;TZID=America/Los_Angeles:20180417T180000 DTSTAMP:20260405T052213 CREATED:20180411T184240Z LAST-MODIFIED:20180416T171625Z UID:390-1523984400-1523988000@inpa.lbl.gov SUMMARY:Heidi Newberg (RPI) - Dwarf galaxies and dark matter in the Milky Way DESCRIPTION:In the past fifteen years\, dozens of tidal streams of stars pulled from dwarf galaxies and globular clusters have been discovered in the Milky Way’s stellar halo. Recently\, it has been discovered that as the dwarf galaxies fall into our galaxy they perturb the stars in the disk\, causing wavelike disturbances that are seen in the densities and velocities of disk stars. These disturbances could be driving force behind spiral structure in galaxies. MilkyWay@home is a petaFLOPS scale volunteer computing platform that is mapping the densities of stars in the larger tidal streams in the stellar halo and using that information to measure the mass and density profile of both the stars and the dark matter in the progenitor dwarf galaxies\, using only information from the stars in the tidal streams. Eventually\, MilkyWay@home will fit the shape of the Galactic potential using tidal streams. URL:https://inpa.lbl.gov/event/heidi-newbert-rpi-dwarf-galaxies-and-dark-matter-in-the-milky-way/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180413T120000 DTEND;TZID=America/Los_Angeles:20180413T130000 DTSTAMP:20260405T052213 CREATED:20180402T154118Z LAST-MODIFIED:20180410T173652Z UID:376-1523620800-1523624400@inpa.lbl.gov SUMMARY:Helion Mas du Bourboux ( University of Utah) - Baryonic Acoustic Oscillations in SDSS and DESI using the intergalactic medium absorption DESCRIPTION:We present the measurement of the Baryonic Acoustic Oscillation (BAO) scale from the correlation between absorption in the intergalactic medium and the positions of galaxies and quasars in the SDSS data and in the desi simulations. \nWe use the absorption by neutral Hydrogen and by Magnesium-II observed in quasar spectra to trace the underlying matter density fluctuations. Combined with galaxies and quasars\, these two tracers allow to measure the 3d cross-correlation of matter from a redshift of z = 0.5 up to a redshift of z = 2.4. URL:https://inpa.lbl.gov/event/helion-mas-du-bourboux-quasars/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180406T120000 DTEND;TZID=America/Los_Angeles:20180406T130000 DTSTAMP:20260405T052213 CREATED:20180314T154601Z LAST-MODIFIED:20180402T153516Z UID:365-1523016000-1523019600@inpa.lbl.gov SUMMARY:Vincent Fischer (UC Davis) - Accelerator Neutrino Neutron Interaction Experiment (ANNIE) DESCRIPTION:The next generation of large scale neutrino detectors\, such as DUNE or Hyper-Kamiokande\, will heavily rely on a precise understanding of neutrino-nucleus interactions to reach their goal of measuring leptonic CP violation. Accounting for and reconstructing all final state particles\, especially neutrons\, created upon such interactions is thus crucial. This is the goal of the ANNIE experiment: Measuring the neutron abundance in the final state of neutrino-nucleus interactions in the energy domain relevant for oscillation experiments. With a volume of about 30 tons of pure water doped with gadolinium to enhance neutron tagging efficiency\, ANNIE will provide a measurement of the neutron yield of neutrino interactions as a function of the neutrino energy in the well-characterized Booster Neutrino Beam at Fermilab. The modularity of ANNIE will allow it to perform the very first live test of a novel kind of photodetectors called LAPPDs (Large Area Picosecond Photodetectors) in a neutrino detector to reconstruct neutrino interaction vertices through precision timing measurement. This seminar will describe the design and construction of the experiment\, along with the background measurement results from Phase~I and the plans for Phase~II. URL:https://inpa.lbl.gov/event/vincent-fischer-uc-davis-tba-accelerator-neutrino-neutron-interaction-experiment-annie/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180326T120000 DTEND;TZID=America/Los_Angeles:20180326T130000 DTSTAMP:20260405T052213 CREATED:20180227T171324Z LAST-MODIFIED:20180321T152158Z UID:358-1522065600-1522069200@inpa.lbl.gov SUMMARY:Dr. Leila Haegel (University of the Balearic Islands\, Spain) - Testing general relativity with gravitational waves DESCRIPTION:Gravitational waves have been directly detected by the LIGO experiment in 2015. Since then\, five black holes and one neutron star binaries merging have been observed during the two observational runs. The measured signals already provided a large amount of physical results\, from the mass distribution of stellar-masses black holes to the short gamma-ray burst mechanisms through measurement of the expansion rate of the Universe and tests of general relativity. Both detection and analysis of gravitational waves rely on the simulation of the expected signal to be extracted from the noise. As the exact computation of gravitational waveforms is a computationally expensive resource\, physicists are building phenomenological models. I will review the process of designing such models as well as their impact on the physics extracted from the signals. URL:https://inpa.lbl.gov/event/dr-leila-haegel-university-of-the-balearic-islands-spain/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180323T120000 DTEND;TZID=America/Los_Angeles:20180323T130000 DTSTAMP:20260405T052213 CREATED:20180119T191700Z LAST-MODIFIED:20180319T200604Z UID:336-1521806400-1521810000@inpa.lbl.gov SUMMARY:Krista Lynne Smith (Stanford) - A New Regime of Optical Variability in AGN: Light Curves from Exoplanet Satellites DESCRIPTION:The optical light curves of AGN provide a unique window into the conditions and behavior within the accretion disk. The development of a specialized pipeline for AGN science with the unparalleled photometry of exoplanet-hunting satellites allows us to explore new optical variability phenomena. Such data provide an opportunity for direct comparison with X-ray light curves\, and promise to inform models of both accretion physics and the relationship between X-ray and optical emitting regions in the central engine. These data will be critical in learning how to interpret AGN light curves from upcoming large variability surveys like LSST. Finally\, exoplanet mission data have enormous future promise for a multifaceted understanding of accretion processes\, including blazar jets and quasi-periodic oscillations. URL:https://inpa.lbl.gov/event/krista-lynne-smith-stanford/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180316T120000 DTEND;TZID=America/Los_Angeles:20180316T130000 DTSTAMP:20260405T052213 CREATED:20180119T190757Z LAST-MODIFIED:20180228T171248Z UID:333-1521201600-1521205200@inpa.lbl.gov SUMMARY:Ana Bonaca (Harvard-CfA) - What are the tidal streams constraining? DESCRIPTION:Cold stellar streams\, remnants of tidally disrupted globular clusters\, have been employed as exquisite tracers of dark matter in the Milky Way. Because of their different positions in phase space\, different ages\, and different levels of observational scrutiny\, different streams tell us different things about the Galaxy. We employ a Cramer–Rao or Fisher-matrix approach to understand the quantitative information content in the known streams. In simple\, static\, analytic models of the Milky Way\, streams on eccentric orbits contain the most information about the dark-matter shape. For any individual stream\, there are near-degeneracies between dark-matter halo properties and parameters describing the Galactic bulge\, disk and the stream progenitor itself\, but we find that simultaneous fitting of multiple streams ought to constrain all parameters to a precision of a few percent. At this level\, simulated dark matter halos deviate from analytic parametrizations\, so we chart the way forward by discussing constraints streams place on more flexible models of the Galactic gravitational potential. URL:https://inpa.lbl.gov/event/ana-bonaca-harvard-cfa-desi-mw-science/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180309T120000 DTEND;TZID=America/Los_Angeles:20180309T130000 DTSTAMP:20260405T052213 CREATED:20180119T190112Z LAST-MODIFIED:20180119T190112Z UID:331-1520596800-1520600400@inpa.lbl.gov SUMMARY:Giorgia Pollina - Unveiling cosmic voids in large-scale structure surveys: the impact of tracer bias DESCRIPTION:The large-scale structure of the Universe can only be observed directly via luminous tracers of the underlying matter density field. However\, luminous tracers\, such as galaxies\, do not precisely mirror the clustering statistic of the bulk of the cold dark matter distribution: their correlation function (or power spectrum) is biased and depends on various properties of the tracers themselves. Although on small scales this bias is an unestablished function of space and time\, on very large scales it results in a constant offset in the clustering amplitude\, known as linear bias. In this talk we focus on the bias of luminous objects within and around cosmic voids\, enormous under-dense regions of the Universe that occupy the vast majority of its volume. As a remarkable result\, we find that\, within voids\, the relation between matter and galaxy density is always linear and determined by a multiplicative constant. Furthermore\, the value of this constant decreases with the increase of the size of voids and asymptotes to the linear bias. This result opens to the possibility of using such simple relation in other voids studies\, allowing to extend our theoretical understanding of voids (typically defined as depressions in the matter density field) to voids that are identified using galaxies as tracers of the matter density. Ultimately we aim to test these findings with observations\, using the Dark Energy Survey data currently available. URL:https://inpa.lbl.gov/event/giorgia-pollina-unveiling-cosmic-voids-in-large-scale-structure-surveys-the-impact-of-tracer-bias/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180302T120000 DTEND;TZID=America/Los_Angeles:20180302T130000 DTSTAMP:20260405T052213 CREATED:20180119T185751Z LAST-MODIFIED:20180228T003105Z UID:326-1519992000-1519995600@inpa.lbl.gov SUMMARY:Andre Walker-Loud (LBNL) - Lattice QCD for Neutrinoless Double Beta Decay DESCRIPTION:In recent years\, lattice QCD has matured to the stage where it is now routine for calculations to be performed at or near the physical pion mass\, with fully controlled extrapolations to the continuum and infinite volume limits. These calculations are predominantly related to flavor physics and heavy quark physics. The application of lattice QCD to nuclear physics is beset by a number of additional challenges which make them exponentially more expensive\, prohibiting the same success so far for low-energy nuclear processes. Algorithmic improvements and the computing power of the next generation supercomputers promises an era in which we will be able to make rigorous\, fully controlled calculations of basic nuclear properties. I will briefly introduce lattice QCD and describe the challenges in applying it to basic nuclear physics. I will then highlight some recent results and outline a strategy for connecting complex\, exotic phenomena such as neutrinoless double beta decay to the fundamental theory of nuclear strong interactions\, Quantum Chromodynamics. aim to test these findings with observations\, using the Dark Energy Survey data currently available. URL:https://inpa.lbl.gov/event/andre-walker-loud-lbnl-tba-lattice-qcd-calculations-of-0%ce%bd%ce%b2%ce%b2-matrix-elements/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180223T120000 DTEND;TZID=America/Los_Angeles:20180223T130000 DTSTAMP:20260405T052213 CREATED:20180216T165728Z LAST-MODIFIED:20180216T191248Z UID:351-1519387200-1519390800@inpa.lbl.gov SUMMARY:Dan Wilkins (Stanford) - Seeing to the Event Horizons of Supermassive Black Holes DESCRIPTION:From the reflection and reverberation of X-rays off the innermost regions of AGN accretion discs\, a three-dimensional picture is starting to emerge of the extreme environments around supermassive black holes in which intense X-ray emission is produced and jets are launched at close to the speed of light. \n  \nRecent advances in the analysis of the X-ray emission and its variability in AGN\, observed by the great X-ray observatories\, coupled with general relativistic ray tracing simulations\, have revealed vast amounts of information about the extreme environments in the immediate vicinity of the black hole event horizon. The effects of general relativity on the reflected emission can be exploited to pinpoint the location of reflection in the strong gravitational field\, while time delays in the X-ray echoes off the accretion disc enable the structure of the innermost regions to be mapped. \n  \nWe discover how the X-ray emitting corona evolves on long and short timescales\, giving rise to orders of magnitude variation in luminosity as well as the processes the corona can undergo during transient events\, most notably the collimation and ejection of portions of the corona during X-ray flares\, reminiscent of the aborted launching of a jet. The latest X-ray reverberation studies are revealing\, for the first time\, structure within the corona including a persistent collimated core akin to the base of a jet\, even in radio-quiet sources\, alongside a second component associated with the accretion disc itself. \n  \nThis gives us important insight into the small-scale processes close to the event horizon that enable supermassive black holes to power some of the most luminous objects in the Universe\, launch vast jets and play their important role in the formation of structure in the Universe. URL:https://inpa.lbl.gov/event/dan-wilkins-stanford/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180216T120000 DTEND;TZID=America/Los_Angeles:20180216T130000 DTSTAMP:20260405T052213 CREATED:20180119T185643Z LAST-MODIFIED:20180119T185643Z UID:324-1518782400-1518786000@inpa.lbl.gov SUMMARY:Samuele Sangiorgio (Lawrence Livermore National Laboratory) - Neutrinoless Double Beta Decay with nEXO: Experiment Concept\, R&D\, and Sensitivity DESCRIPTION:The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta (0νββ) decay whose observation would imply lepton number violation and confirm the existence of elementary Majorana fermions. nEXO searches for 0νββ in 136 Xe with a target half-life sensitivity of approximately 10 28 years using 5×10 3 kg of isotopically enriched liquid-xenon in a time projection chamber. This improvement of two orders of magnitude in sensitivity over current limits is obtained by a significant increase of the 136Xe mass\, the monolithic and homogeneous configuration of the active medium\, and the multi-parameter measurements of the interactions enabled by the time projection chamber. This seminar will introduce nEXO’s detector concept\, present the R&D activities\, and discuss the anticipated performance based upon demonstrated realizable background rates. URL:https://inpa.lbl.gov/event/samuele-sangiorgio-lawrence-livermore-national-laboratory-neutrinoless-double-beta-decay-with-nexo-experiment-concept-rd-and-sensitivity/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180212T120000 DTEND;TZID=America/Los_Angeles:20180212T130000 DTSTAMP:20260405T052213 CREATED:20180119T181830Z LAST-MODIFIED:20180208T010525Z UID:322-1518436800-1518440400@inpa.lbl.gov SUMMARY:Special - Danielle Leonard (CMU) - Measuring the scale-dependence of intrinsic alignments using multiple shear estimates DESCRIPTION:The next generation of cosmological surveys promises significant advancements in the field of weak gravitational lensing. As such\, it is crucial that relevant systematic effects such as the intrinsic alignment of galaxies are well-understood. I will discuss a new method for measuring the scale-dependence of the intrinsic alignment contamination to the galaxy-galaxy lensing signal\, which takes advantage of multiple shear estimates applied to the same data set. For a galaxy-galaxy lensing measurement which uses LSST sources and DESI lenses\, the signal-to-noise on the intrinsic alignment signal measured by our method is forecast to improve on an existing method (Blazek et al. 2012) by a factor of >2\, for optimally chosen pairs of shear estimates. URL:https://inpa.lbl.gov/event/special-danielle-leonard-cmu/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180209T120000 DTEND;TZID=America/Los_Angeles:20180209T130000 DTSTAMP:20260405T052213 CREATED:20180119T181418Z LAST-MODIFIED:20180207T154537Z UID:319-1518177600-1518181200@inpa.lbl.gov SUMMARY:Wing Yan Ma (Imperial College London) - Recent Neutrino Oscillation Results from T2K DESCRIPTION:T2K is a long baseline neutrino experiment situated in Japan. A muon neutrinos and antineutrinos beam is produced and fired 295km across the country and observed using the 50 kTon Super Kamiokande detector. By studying how many of these neutrinos have oscillated into different flavours and whether the oscillations occur differently for antineutrinos we have sensitivity to CP violation in the neutrino sector. I will present the latest results of the neutrino oscillation measurements using data collected up to May 2017\, including new limits on the CP violating parameter δCP. URL:https://inpa.lbl.gov/event/wing-yan-ma-imperial-college-london-t2k/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180202T120000 DTEND;TZID=America/Los_Angeles:20180202T130000 DTSTAMP:20260405T052213 CREATED:20180119T180543Z LAST-MODIFIED:20180119T180543Z UID:315-1517572800-1517576400@inpa.lbl.gov SUMMARY:Jason Bono (Fermilab) - Muon Anomalies and Their Future Investigations DESCRIPTION:The muon is 200 times heavier than the electron and still lighter than any hadron\, which make it’s interactions\, at once\, potentially sensitive to undiscovered phenomena\, and predictable to high precision within the Standard Model. The muon’s ease of production\, natural polarization and self analyzing decay\, and comparatively long lifetime also allow for extremely high precision measurements of fundamental constants and interactions. Muons thus offer a unique probe to search for physics beyond the Standard Model. \nThis discussion will first elaborate on some of the experimental and theoretical niceties of the muon\, and briefly look at the particle from a historical perspective\, emphasizing a few of the many important roles that it’s played in piecing together our current understanding of particle physics. We will then look at a variety of anomalies in experiments using muons\, which\, taken together may suggest the possibility of sensitivity to new physics within reach of future experiments\, some of which will also be looked at. Topics include recent developments in the proton radius puzzle\, the muon anomalous magnetic moment\, hints of lepton flavor non-universality in B decays\, and searches for charged lepton flavor violation. For fun\, a recent discovery in the Great Pyramid of Giza using muon tomography will also be discussed. URL:https://inpa.lbl.gov/event/jason-bono-fermilab-muon-anomalies-and-their-future-investigations/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180126T120000 DTEND;TZID=America/Los_Angeles:20180126T130000 DTSTAMP:20260405T052213 CREATED:20180119T175958Z LAST-MODIFIED:20180122T214337Z UID:312-1516968000-1516971600@inpa.lbl.gov SUMMARY:Elizabeth Wills (Drexel) - Probing Cosmic Ray Anisotropy in the Northern Hemisphere with Atmospheric Neutrinos DESCRIPTION:Cosmic Rays have remained an enigma for over a hundred years since their discovery. This talk focuses on a well-measured\, yet similarly elusive feature; an unexplained structure in arrival direction spanning many energies and angular scales. This talk introduces a new way of exploring Cosmic Ray Anisotropy: observation through secondary neutrinos. Studying the cosmic rays’ neutral daughter particles with pointing capabilities\, like neutrinos\, could shed new light. This can be done at two levels; a source which produces cosmic rays must also produce high energy astrophysical neutrinos\, and low energy atmospheric neutrinos are made when the cosmic rays interact with the atmosphere. This analysis focuses on atmospheric neutrinos detected by IceCube\, a Cherenkov detector instrumenting a kilometer cubed of glacial ice at the South Pole. IceCube has studied the anisotropy and its energy dependence in the Southern sky using atmospheric muons.\n\nUsing IceCube and a high-acceptance dataset of atmospheric neutrinos created for this analysis\, we are nearing the sensitivity threshold to observe the phenomenon in atmospheric neutrinos arriving from the Northern Hemisphere. This analysis focuses on energy ranges that correspond to the spatially-consistent lower energy features of the dipole structure. Due to the statistical limitations of the neutrino dataset in comparison to the cosmic ray datasets\, we also introduce new methods for detecting signal along with the standard multipole analysis methods. These include a 1D relative intensity fit to determine the amplitude and phase of the dipole\, and a 2D binned log-likelihood analysis focusing on searching for observed anisotropy maps from the Tibet collaboration. Future hope for the work is to create a single-detector all-sky map of the anisotropy\, minimizing systematical difficulties combining datasets from separate collaborations. URL:https://inpa.lbl.gov/event/elizabeth-wills-drexel-icecube/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180123T120000 DTEND;TZID=America/Los_Angeles:20180123T130000 DTSTAMP:20260405T052213 CREATED:20180119T180752Z LAST-MODIFIED:20180119T181203Z UID:317-1516708800-1516712400@inpa.lbl.gov SUMMARY:Bjoern Lehnert (Carleton University) - Dark Matter Search with DEAP-3600 and the Importance of Rare Nuclear Decay Searches DESCRIPTION:The DEAP-3600 experiment is searching for dark matter with a single phase liquid argon (LAr) target\, located at SNOLAB. For a background-free exposure of 3000 kg·yr\, the projected sensitivity to the spin-independent WIMP-nucleon cross section at 100 GeV/c2 WIMP mass is 1e-46 cm2. The construction and filling of DEAP-3600 was completed in 2016 and the experiment is currently taken physics data. Recently\, the first results of an initial commissioning data set were presented which could successfully demonstrate the detector performance and resulted in the leading limit on the WIMP-nucleon spin-independent cross section for argon. \nIn the first part of this seminar I will present the DEAP-3600 experiment and its recent results with an emphasis on radioactive backgrounds. In the second part of the seminar I will briefly describe a few recent investigations of rare beta and double beta decay processes such as 36Ar\, 39Ar and 42Ar with DEAP but also other isotopes with gamma-spectroscopy setups. I will illustrate their importance in the context of radioactive backgrounds in other low background experiments and in the context of understanding nuclear structure. Especially the better understanding of nuclear models and their intrinsic parameters is needed to obtain more reliable nuclear matrix elements e.g. for neutrinoless double beta decay processes in order to connect the observed half-life to the the effective Majorana neutrino mass. URL:https://inpa.lbl.gov/event/bjoern-lehnert-carleton-university-dark-matter-search-with-deap-3600-and-the-importance-of-rare-nuclear-decay-searches/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20180112T120000 DTEND;TZID=America/Los_Angeles:20180112T130000 DTSTAMP:20260405T052213 CREATED:20180104T163059Z LAST-MODIFIED:20180104T163059Z UID:306-1515758400-1515762000@inpa.lbl.gov SUMMARY:Hirotaka Ito - Numerical Simulations of Photospheric Emission from Collapsar Jets DESCRIPTION:We explore the photospheric emission from a relativistic jet breaking out\nfrom a massive stellar envelope based on relativistic hydrodynamical simulations and post- process radiation transfer calculations in three dimensions. It is shown that structures developed within the jet during its propagation have a significant imprint on the resulting emission. Particularly\, we show that the viewing angle dependence of the emission properties caused by the lateral structure naturally reproduces the observed correlation between the peak energy and luminosity (Yonetoku relation). We also show that the emission possesses non-negligible degree of polarization. URL:https://inpa.lbl.gov/event/hirotaka-ito-numerical-simulations-of-photospheric-emission-from-collapsar-jets/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171215T120000 DTEND;TZID=America/Los_Angeles:20171215T130000 DTSTAMP:20260405T052213 CREATED:20171019T175334Z LAST-MODIFIED:20171019T175334Z UID:293-1513339200-1513342800@inpa.lbl.gov SUMMARY:Marco Salathe (LBL) - GRETA R&D DESCRIPTION: URL:https://inpa.lbl.gov/event/marco-salathe-lbl-greta-rd/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171208T080000 DTEND;TZID=America/Los_Angeles:20171208T170000 DTSTAMP:20260405T052213 CREATED:20171019T175220Z LAST-MODIFIED:20171019T175234Z UID:291-1512720000-1512752400@inpa.lbl.gov SUMMARY:Anna Zsigmond - GERDA neutrinoless double beta decay experiment DESCRIPTION: URL:https://inpa.lbl.gov/event/anna-zsigmond-gerda-neutrinoless-double-beta-decay-experiment/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171201T120000 DTEND;TZID=America/Los_Angeles:20171201T130000 DTSTAMP:20260405T052213 CREATED:20171019T174909Z LAST-MODIFIED:20171130T173507Z UID:287-1512129600-1512133200@inpa.lbl.gov SUMMARY:Yuan Mei (LBL) - TPC without charge multiplication: a CMOS direct readout towards neutrinoless double-beta decay and other applications DESCRIPTION:High-pressure gaseous TPCs provide a unique combination of excellent energy resolution\, event tracking for background discrimination\, and scalability\, which are ideal for neutrinoless double-beta decay searches. We are developing a pixelated charge readout plane filled with an array of CMOS sensors to harness the power of such a TPC. Each CMOS sensor has an exposed metal patch for direct charge collection and integrates charge sensitive amplifiers as well as signal processing and digitization/data transmission circuitry. The electronic noise is suppressed to a level that the required signal-to-noise ratio is achieved without the need of charge multiplication. It provides competitive energy resolution while improves on tracking capability\, stability\, and scalability compared to alternative readout schemes. Moreover\, ions drifting in the gas can be read directly since the otherwise prohibitive ion avalanche is unnecessary. It enables the use of alternative gases and double-beta decay candidate isotopes such as $^{82}$SeF$_6$ gas\, in which only ion drifting is possible. With modest modifications\, the readout plane could be used in liquid noble gas and organic liquid TPCs for a broad range of applications. The design and the progress of the first prototype will be presented. URL:https://inpa.lbl.gov/event/yuan-mei-lbl-cmos-gainless-charge-readout-for-tpc/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171124T080000 DTEND;TZID=America/Los_Angeles:20171124T170000 DTSTAMP:20260405T052213 CREATED:20171019T175040Z LAST-MODIFIED:20171019T175040Z UID:289-1511510400-1511542800@inpa.lbl.gov SUMMARY:Holiday DESCRIPTION: URL:https://inpa.lbl.gov/event/holiday/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171110T120000 DTEND;TZID=America/Los_Angeles:20171110T130000 DTSTAMP:20260405T052213 CREATED:20171019T174749Z LAST-MODIFIED:20171027T144234Z UID:285-1510315200-1510318800@inpa.lbl.gov SUMMARY:Katelin Schutz (UCB) - Excluding a thin dark matter disk in the Milky Way with Gaia DR1: Resurrecting the Dinosaurs DESCRIPTION:If a component of the dark matter has dissipative interactions\, it could collapse to form a thin dark disk in our Galaxy coincident with the baryonic disk. It has been suggested that dark disks could explain a variety of observed phenomena\, including mass extinction events due to periodic comet impacts. Using the first data release from the Gaia space observatory\, I will present the results of a search for a dark disk via its effect on stellar kinematics in the Milky Way. I will discuss our strong new limits that disfavor the presence of a thin dark matter disk and present updated measurements on the total matter density in the solar neighborhood. URL:https://inpa.lbl.gov/event/katelin-schutz-ucb/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171103T120000 DTEND;TZID=America/Los_Angeles:20171103T130000 DTSTAMP:20260405T052213 CREATED:20171019T174547Z LAST-MODIFIED:20171024T173800Z UID:283-1509710400-1509714000@inpa.lbl.gov SUMMARY:Noah Kurinsky (Stanford) - Pushing to Low Mass with SuperCDMS SNOLAB: New Developments in Ultra-Low Threshold Dark Matter Detectors DESCRIPTION:In the last few years\, the dark matter field has bifurcated into experiments focused on wimp-scale dark matter with massive liquid noble detectors and experiments focused on so-called ‘hidden sectors’ dark matter\, pushing small detectors to much lower energy resolutions. Low-mass dark matter searches\, focusing on single eV-scale energy deposits\, are sensitive to different backgrounds than their higher-threshold counterparts\, including but not limited to infrared emissions from the experimental environment and low-rate cosmogenic contamination in the target materials. The traditional paradigm of 2-phase detectors used to discriminate between electronic and nuclear recoils is no longer effective\, both because of experimental limitations and kinematic constraints. The low-mass reach of SuperCDMS SNOLAB is based on the idea of moving from a phonon+charge readout to a charge-mediated phonon readout; introducing degeneracy between our separate detection channels to achieve lower thresholds. In this talk I will discuss the theory behind the CDMS-HV detector technology and present exciting results from prototype detectors run at test facilities in the CDMS collaboration. I will then discuss the science reach given these results\, and explore future directions with this technology.I will describe our development of a convolutional neural network (CNN) to learn to search for and characterize absorption lines in quasar spectra. Specifically\, the algorithm discovers and measures the redshift and Hydrogen column density of damped Lya systems (DLAs). These systems dominate the neutral hydrogen gas of the universe\, trace the interstellar medium of distant galaxies\, and offer cosmological constraints on the build up of gas and heavy elements across cosmic time. I will discuss the lessons learned employing CNN techniques on large spectral datasets and the prospects for future analysis. URL:https://inpa.lbl.gov/event/noah-kurinsky-stanford/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171027T120000 DTEND;TZID=America/Los_Angeles:20171027T130000 DTSTAMP:20260405T052213 CREATED:20171024T173237Z LAST-MODIFIED:20171024T173314Z UID:297-1509105600-1509109200@inpa.lbl.gov SUMMARY:Xavier Prochaska (UCSD) - Deep Learning of Quasar Spectra DESCRIPTION:I will describe our development of a convolutional neural network (CNN) to learn to search for and characterize absorption lines in quasar spectra. Specifically\, the algorithm discovers and measures the redshift and Hydrogen column density of damped Lya systems (DLAs). These systems dominate the neutral hydrogen gas of the universe\, trace the interstellar medium of distant galaxies\, and offer cosmological constraints on the build up of gas and heavy elements across cosmic time. I will discuss the lessons learned employing CNN techniques on large spectral datasets and the prospects for future analysis. URL:https://inpa.lbl.gov/event/xavier-prochaska-ucsd-deep-learning-of-quasar-spectra/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171020T120000 DTEND;TZID=America/Los_Angeles:20171020T130000 DTSTAMP:20260405T052213 CREATED:20171019T173727Z LAST-MODIFIED:20171019T173801Z UID:281-1508500800-1508504400@inpa.lbl.gov SUMMARY:Prabhat (NERSC at LBL) - Deep Learning for Science DESCRIPTION:Deep Learning has revolutionized the fields of computer vision\, speech recognition and control systems. Can Deep Learning (DL) work for scientific problems? This talk will explore a variety of DOE/LBL applications that are currently benefiting from Deep Learning. We will review classification and regression problems in astronomy\, cosmology\, neuroscience\, genomics and high-energy physics. We will outline several short and long-term challenges at the frontier of DL research\, and speculate about the future of DL for data-intensive science. URL:https://inpa.lbl.gov/event/prabhat-nersc-at-lbl-deep-learning-for-science/ LOCATION:50A-5132- Sessler\, 50A-5132 Sessler Conference Room\, CA END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/Los_Angeles:20171013T120000 DTEND;TZID=America/Los_Angeles:20171013T130000 DTSTAMP:20260405T052213 CREATED:20171010T231405Z LAST-MODIFIED:20171019T173539Z UID:277-1507896000-1507899600@inpa.lbl.gov SUMMARY:Michael Walther (UCSB) - New Constraints on Thermal Evolution in the IGM from the Small Scale Lyα Forest Power Spectrum DESCRIPTION:The line-of-sight power spectrum (P_F(k)) of the Ly-α forest has proven to be a valuable tool for doing cosmological observations. It also not only allows to constrain cosmological parameters\, but enables us to measure the thermal state of the IGM at redshifts z>1.8. While at large scales (k<0.02 s/km) P_F(k) has been accurately measured using the large number (10^3-10^5) of quasar sightlines from SDSS and BOSS\, there are much less spectra available at smaller scales (larger k). Prior power spectrum measurements from high-resolution data only used several times less (QSO) spectra in our redshift range about 15 years ago whereas a few hundred became available in the meantime. We therefore performed a new measurement using 74 quasar sightlines with 1.8