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Prosa TJ, Oltman E. Study of LEAP® 5000 Deadtime and Precision via Silicon Pre-Sharpened-Microtip™ Standard Specimens. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2021; 28:1-19. [PMID: 34315558 DOI: 10.1017/s143192762101206x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Atom probe tomography (APT) is a technique that has expanded significantly in terms of adoption, dataset size, and quality during the past 15 years. The sophistication used to ensure ultimate analysis precision has not kept pace. The earliest APT datasets were small enough that deadtime and background considerations for processing mass spectrum peaks were secondary. Today, datasets can reach beyond a billion atoms so that high precision data processing procedures and corrections need to be considered to attain reliable accuracy at the parts-per-million level. This paper considers options for mass spectrum ranging, deadtime corrections, and error propagation as applied to an extrinsic-silicon standard specimen to attain agreement for silicon isotopic fraction measurements across multiple instruments, instrument types, and acquisition conditions. Precision consistent with those predicted by counting statistics is attained showing agreement in silicon isotope fraction measurements across multiple instruments, instrument platforms, and analysis conditions.
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Affiliation(s)
- Ty J Prosa
- CAMECA Instruments, Inc., 5470 Nobel Drive, Madison, WI53711, USA
| | - Edward Oltman
- CAMECA Instruments, Inc., 5470 Nobel Drive, Madison, WI53711, USA
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Su B, Kong LG, Zhang AB, Klecker B, Escoubet CP, Kataria DO, Dai L. Performance and simulated moment uncertainties of an ion spectrometer with asymmetric 2π field of view for ion measurements in space. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:024501. [PMID: 33648106 DOI: 10.1063/5.0028866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 01/22/2021] [Indexed: 06/12/2023]
Abstract
Space plasma instruments provide 3D particle velocity distribution functions. Because of telemetry limitations, these cannot be transmitted in high time resolution and the plasma needs to be characterized by moments of the velocity distribution function. These moment uncertainties have vital effects on the reliability and accuracy of onboard plasma moments. We assess the measurement accuracy for magnetosheath and solar wind ions using an ion spectrometer with an asymmetric field of view designed for the all-sky measurement of low-energy ions in the magnetosheath and solar wind. We focus on moment uncertainties for the ideal spectrometer, not considering the background counts, which may have considerable effects on the uncertainties in real life. To obtain number density, bulk velocity, and temperature, different orders of moments are integrated assuming a Maxwellian velocity distribution. Based on the design specifications, we use simulations to estimate systematic and random errors for typical plasma conditions. We find that the spectrometer resolution is adequate for determining the density of solar wind (∼7% error) and magnetosheath ions (∼4% error). The resolution is also adequate for determining the temperature of solar wind (∼10% error) and magnetosheath ions (∼2% error). For high speed flows with a bulk velocity of 750 km/s and a temperature of 20 eV, the maximum density and temperature errors become 9% and 7%, respectively. The bulk velocity errors are less than 2% for all cases. The contributions of heavy ions to the systematic errors are less than 5% for magnetosheath ions and less than 8% for solar wind ions.
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Affiliation(s)
- B Su
- National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
| | - L G Kong
- National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
| | - A B Zhang
- National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
| | - B Klecker
- Max-Planck-Institut für extraterrestrische Physik, Garching 85748, Germany
| | - C P Escoubet
- European Space Research and Technology Center, European Space Agency, Noordwijk 2201AZ, The Netherlands
| | - D O Kataria
- Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey RH5 6NT, United Kingdom
| | - L Dai
- National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
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Vogt MF, Connerney JEP, DiBraccio GA, Wilson RJ, Thomsen MF, Ebert RW, Clark GB, Paranicas C, Kurth WS, Allegrini F, Valek PW, Bolton SJ. Magnetotail Reconnection at Jupiter: A Survey of Juno Magnetic Field Observations. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2020; 125:e2019JA027486. [PMID: 32874821 DOI: 10.1029/2018ja026169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 07/29/2019] [Indexed: 05/24/2023]
Abstract
At Jupiter, tail reconnection is thought to be driven by an internal mass loading and release process called the Vasyliunas cycle. Galileo data have shown hundreds of reconnection events occurring in Jupiter's magnetotail. Here we present a survey of reconnection events observed by Juno during its first 16 orbits of Jupiter (July 2016-October 2018). The events are identified using Juno magnetic field data, which facilitates comparison to the Vogt et al. (2010, https://doi.org/10.1029/2009JA015098) survey of reconnection events from Galileo magnetometer data, but we present data from Juno's other particle and fields instruments for context. We searched for field dipolarizations or reversals and found 232 reconnection events in the Juno data, most of which featured an increase in |B θ |, the magnetic field meridional component, by a factor of 3 over background values. We found that most properties of the Juno reconnection events, like their spatial distribution and duration, are comparable to Galileo, including the presence of a ~3-day quasi-periodicity in the recurrence of Juno tail reconnection events and in Juno JEDI, JADE, and Waves data. However, unlike with Galileo we were unable to clearly define a statistical x-line separating planetward and tailward Juno events. A preliminary analysis of plasma velocities during five magnetic field reconnection events showed that the events were accompanied by fast radial flows, confirming our interpretation of these magnetic signatures as reconnection events. We anticipate that a future survey covering other Juno datasets will provide additional insight into the nature of tail reconnection at Jupiter.
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Affiliation(s)
- Marissa F Vogt
- Center for Space Physics, Boston University, Boston, MA, USA
| | | | | | - Rob J Wilson
- Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA
| | | | - Robert W Ebert
- Southwest Research Institute, San Antonio, TX, USA
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
| | - George B Clark
- The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
| | - Christopher Paranicas
- The Johns Hopkins University Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
| | - William S Kurth
- Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
| | - Frédéric Allegrini
- Southwest Research Institute, San Antonio, TX, USA
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX, USA
| | - Phil W Valek
- Southwest Research Institute, San Antonio, TX, USA
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Scime EE, Keesee AM, Dugas M, Ellison S, Tersteeg J, Wagner G, Barrie A, Rager A, Elliott D. A micro-scale plasma spectrometer for space and plasma edge applications (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11D302. [PMID: 27910531 DOI: 10.1063/1.4960145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A plasma spectrometer design based on advances in lithography and microchip stacking technologies is described. A series of curved plate energy analyzers, with an integrated collimator, is etched into a silicon wafer. Tests of spectrometer elements, the energy analyzer and collimator, were performed with a 5 keV electron beam. The measured collimator transmission and energy selectivity were in good agreement with design targets. A single wafer element could be used as a plasma processing or fusion first wall diagnostic.
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Affiliation(s)
- E E Scime
- Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315, USA
| | - A M Keesee
- Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315, USA
| | - M Dugas
- Advanced Research Corporation, White Bear Lake, Minnesota 55110, USA
| | - S Ellison
- Advanced Research Corporation, White Bear Lake, Minnesota 55110, USA
| | - J Tersteeg
- Advanced Research Corporation, White Bear Lake, Minnesota 55110, USA
| | - G Wagner
- Advanced Research Corporation, White Bear Lake, Minnesota 55110, USA
| | - A Barrie
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
| | - A Rager
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
| | - D Elliott
- Department of Physics, West Virginia University, Morgantown, West Virginia 26506-6315, USA
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