Shawn McKee
A5048046068- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Distributed and Parallel Computing Systems
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Advanced Data Storage Technologies
- Scientific Computing and Data Management
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Radiation Therapy and Dosimetry
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Cloud Computing and Resource Management
- Peer-to-Peer Network Technologies
- Network Traffic and Congestion Control
- Software-Defined Networks and 5G
- CCD and CMOS Imaging Sensors
- Distributed systems and fault tolerance
- Software System Performance and Reliability
University of Michigan
2015-2025
Michigan United
2002-2024
California Institute of Technology
2014-2016
Ann Arbor Center for Independent Living
2004-2012
Omeros Corporation (United States)
2012
European Organization for Nuclear Research
2010
University of Tennessee at Knoxville
2007
Youngstown State University
2006
Stockholm University
2003
Pennsylvania State University
1998-2001
Two measurements of the cosmic-ray positron fraction as a function energy have been made using High-Energy Antimatter Telescope (HEAT) balloon-borne instrument. The first flight took place from Fort Sumner, New Mexico, in 1994 and yielded results above geomagnetic cutoff 4.5 GeV. second flight, Lynn Lake, Manitoba, 1995, permitted over larger interval, 1 to 50 We present on based data Lake compare these with previously published Sumner flight. confirm that does not increase ≈ 10 GeV,...
Neuroscience is advancing standardization and tool development to support rigor transparency. Consequently, data pipeline complexity has increased, hindering FAIR (findable, accessible, interoperable reusable) access. brainlife.io was developed democratize neuroimaging research. The platform provides standardization, management, visualization processing automatically tracks the provenance history of thousands objects. Here, described evaluated for validity, reliability, reproducibility,...
Measurements of the energy spectra negative electrons and positrons have been performed with High-Energy Antimatter Telescope (HEAT) in two balloon flights—1994 May from Fort Sumner, NM, 1995 August Lynn Lake, Manitoba. We present combined data set these flights, covering range 1-100 GeV. compare our results other groups discuss context diffusive propagation models. There is some evidence that primary above 10 GeV cosmic-ray nuclei exhibit same spectrum at source, but source becomes harder...
We present a new measurement of the cosmic-ray positron fraction at energies between 5 and 15 GeV with balloon-borne HEAT-pbar instrument in spring 2000. The data presented here are compatible our previous measurements, obtained different instrument. combined from three HEAT flights indicate small flux nonstandard origin above GeV. compare earlier HEAT-e(+/-) instrument, during opposite epoch solar cycle, conclude that measurements do not support predictions charge sign dependent modulation abundance
The Grid2003 Project has deployed a multivirtual organization, application-driven grid laboratory (Grid3) that sustained for several months the production-level services required by physics experiments of Large Hadron Collider at CERN (ATLAS and CMS), Sloan Digital Sky Survey project, gravitational wave search experiment LIGO, BTeV Fermilab, as well applications in molecular structure analysis genome analysis, computer science research projects such areas job data scheduling. infrastructure...
Observations of cosmic-ray electrons and positrons have been made with a new balloon-borne detector, the High-Energy Antimatter Telescope (HEAT), which was first flown in 1994 May from Fort Sumner, New Mexico. We describe instrumental approach data analysis procedures, we present results this flight. The measurement has provided determination individual energy spectra 5 GeV to about 50 combined "all-electron" intensity (e+ + e-) up ~100 GeV. single power-law spectral indices for are α = 3.09...
We present a new measurement of the antiproton-to-proton abundance ratio, pbar/p, in cosmic radiation. The HEAT-pbar instrument, balloon borne magnet spectrometer with precise rigidity and multiple energy loss capability, was flown successfully Spring 2000, at an average atmospheric depth 7.2 g/cm(2). A total 71 antiprotons were identified above vertical geomagnetic cutoff 4.2 GV. highest measured proton 81 GeV. find that pbar/p ratio agrees expected from purely secondary origin produced by...
We describe the results of a balloon-borne apparatus searching for low-energy antiprotons in Galactic cosmic rays. For energies less than 640 MeV at top atmosphere, no cosmic-ray were observed. This yields an upper limit to $\frac{\overline{p}}{p}$ ratio 4.6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}5}$ 85% confidence level.
While the LHC data movement systems have demonstrated ability to move at necessary throughput, we identified two weaknesses: latency for physicists access and complexity of tools involved. To address these, both ATLAS CMS begun federate regional storage using Xrootd. Xrootd, referring a protocol implementation, allows us provide all disk-resident from single virtual endpoint. This "redirector" discovers actual location redirects client appropriate site. The approach is particularly...
We present a new measurement of the cosmic-ray positron fraction ${e}^{+}/({e}^{+}{+e}^{\ensuremath{-}})$ obtained from first balloon flight High Energy Antimatter Telescope (HEAT). Using magnet spectrometer combined with transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved high degree background rejection. Our results do not indicate major contribution to flux primary sources. In particular, see no evidence for significant rise in at...
The SuperNova / Acceleration Probe (SNAP) is a space-based experiment to measure the expansion history of Universe and study both its dark energy matter. motivated by startling discovery that accelerating. A 0.7 square-degree imager comprised 36 large format fully-depleted n-type CCD's sharing focal plane with HgCdTe detectors forms heart SNAP, allowing lightcurve measurements simultaneously for many supernovae. high-efficiency low-resolution integral field spectrograph are coupled 2-m three...
The Grid2003 Project has deployed a multivirtual organization, application-driven grid laboratory ("Grid3") that sustained for several months the production-level services required by physics experiments of Large Hadron Collider at CERN (ATLAS and CMS), Sloan Digital Sky Survey project, gravitational wave search experiment LIGO, BTeV Fermilab, as well applications in molecular structure analysis genome analysis, computer science research projects such areas job data scheduling....
view Abstract Citations (47) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Cosmic-Ray 3He/ 4He Ratio from 100 to 1600 MeV AMU -1 Beatty, J. ; Ficenec, D. Tobias, S. Mitchell, W. McKee, Nutter, Tarle, G. Tomasch, A. Clem, Guzik, T. Lijowski, M. Wefel, P. Bower, C. R. Heinz, Mufson, L. Musser, Pitts, Spiczak, Ahlen, Zhou, B. Superconducting Magnet Instrument for Light Isotopes (SMILI) flew 19 hours on September 1, 1989, with a residual...
view Abstract Citations (53) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Limits on the Antiproton/Proton Ratio in Cosmic Radiation from 100 MeV to 1580 Salamon, M. H. ; McKee, S. Musser, J. A. Tarle, G. Tomasch, Bower, C. R. Heinz, Miller, L. Mufson, Barwick, W. Gerbier, Lowder, D. Price, P. B. Zhou, Beatty, Ahlen, A search for antiprotons (p-bars) cosmic radiation with energies below at top of atmosphere was performed using PBAR...
We present data from the second flight of superconducting magnet instrument for light isotopes (SMILI), which took place on 1991 July 24. This was optimized to determine isotopic composition He, Li, Be, and B in Galactic cosmic rays, up an energy 2 GeV amu-1. The abundances are found be consistent with standard models cosmic-ray propagation. Our measurement beryllium suggests enhancement fraction isotope 10Be over that at low energy. Of 26 events, nine 10Be. Monte Carlo calculations based...
The Supernova / Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of acceleration Universe's expansion by performing series complementary systematics-controlled measurements. We describe self-consistent reference mission design for building Type Ia supernova Hubble diagram wide-area weak gravitational lensing study. A 2-m wide-field telescope feeds focal plane consisting 0.7 square-degree imager tiled with equal...
TeraPaths is a DOE MICS/SciDAC-fundedproject conceived to address the needs of high energy and nuclear physics scientific community for effectively protecting data flows various levels priority through modern high-speed networks. rapidly evolving from last-mile, LAN QoS provider distributed end-to-end network path negotiator multiple administrative domains. Developed as web service-based software system, automates establishment paths with guarantees between end sites by configuring their...
The Worldwide LHC Computing Grid relies on the network as a critical part of its infrastructure and therefore needs to guarantee effective usage prompt detection resolution any issues, including connection failures, congestion, traffic routing, etc. WLCG Network Transfer Metrics project aims integrate combine all network-related monitoring data collected by infrastructure. This includes FTS information, from XRootD federation, well results perfSONAR tests. main challenge consists further...
Scientific innovation continues to increase requirements for the computing and networking infrastructures of world. Collaborative partners, instrumentation, storage, processing facilities are often geographically topologically separated, as is case with LHC virtual organizations. These separations challenge technology used interconnect available resources, delivered by Research Education (R&E) providers, leads complications in overall process end-to-end data management.
Modern scientific data-intensive applications brought about the need for novel data transfer technologies and automated tools capable of effectively utilizing available raw network bandwidth intelligently assisting scientists in replicating large volumes to desired locations a timely manner. In this paper we describe design StorNet, an integrated end-to-end resource provisioning management system high performance transfers that can operate with heterogeneous protocols storage systems...
We describe progress on building the SLATE (Services Layer at Edge) platform. The high level goal of is to facilitate creation multi-institutional science computing systems by augmenting canonical Science DMZ pattern with a generic, "programmable", secure and trusted underlayment This platform permits hosting advanced container-centric services needed for higher-level capabilities such as data transfer nodes, software caches, workflow gateway components. uses best-of-breed center...
uGridNFS combines the NFSv4 protocol and a collection of supporting middleware services configured to run in Globus environment. GridNFS provides file system name space that spans virtual organization, security meshes with Globus, fine-grained access control lists support organization groups users, secure for jobs scheduled an indeterminate future. By combining integrating standard Internet protocols, remains fully compatible standards-compliant desktop enterprise network services....