Search Results - "Tokar, R.L"

Pre-flight calibration and initial data processing for the ChemCam laser-induced breakdown spectroscopy instrument on the Mars Science Laboratory rover by Wiens, R.C., Maurice, S., Lasue, J., Forni, O., Anderson, R.B., Clegg, S., Bender, S., Blaney, D., Barraclough, B.L., Cousin, A., Deflores, L., Delapp, D., Dyar, M.D., Fabre, C., Gasnault, O., Lanza, N., Mazoyer, J., Melikechi, N., Meslin, P.-Y., Newsom, H., Ollila, A., Perez, R., Tokar, R.L., Vaniman, D.

“…The ChemCam instrument package on the Mars Science Laboratory rover, Curiosity, is the first planetary science instrument to employ laser-induced breakdown…”
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Production, ionization and redistribution of O2 in Saturn's ring atmosphere by JOHNSON, R. E, LUHMANN, J. G, LIU, M, CRARY, F. J, YOUNG, D. T, TOKAR, R. L, BOUHRAM, M, BENHELIER, J. J, SITTLER, E. C, COOPER, J. F, HILL, T. W, SMITH, H. T, MICHAEL, M

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A model of the ionosphere of Saturn's rings and its implications by Luhmann, J.G., Johnson, R.E., Tokar, R.L., Ledvina, S.A., Cravens, T.E.

“…The detection of cold O 2 + and O + ions in the vicinity of Saturn's rings during the Cassini Orbiter orbit insertion confirmed expectations that the rings…”
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Gamma-ray and neutron spectrometer for the Dawn mission to 1 Ceres and 4 Vesta by Prettyman, T.H., Feldman, W.C., Ameduri, F.P., Barraclough, B.L., Cascio, E.W., Fuller, K.R., Funsten, H.O., Lawrence, D.J., McKinney, G.W., Russell, C.T., Soldner, S.A., Storms, S.A., Szeles, C., Tokar, R.L.

“…We present the design of the gamma-ray and neutron spectrometer (GR/NS) for Dawn, which is a NASA Discovery-class mission to explore two of the largest…”
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Cassini Finds an Oxygen-Carbon Dioxide Atmosphere at Saturn's Icy Moon Rhea by Teolis, B.D, Jones, G.H, Miles, P.F, Tokar, R.L, Magee, B.A, Waite, J.H, Roussos, E, Young, D.T, Crary, F.J, Coates, A.J, Johnson, R.E, Tseng, W.-L, Baragiola, R.A

“…The flyby measurements of the Cassini spacecraft at Saturn's moon Rhea reveal a tenuous oxygen (O₂)-carbon dioxide (CO₂) atmosphere. The atmosphere appears to…”
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Laser-induced breakdown spectra of rock powders at variable ablation and collection angles under Mars-analog conditions by Breves, E.A., Lepore, K., Dyar, M.D., Bender, S.C., Tokar, R.L., Boucher, T.

“…Laser-induced breakdown spectroscopy has become a popular tool for rapid elemental analysis of geological materials. However, quantitative applications of LIBS…”
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Correcting for variable laser-target distances of laser-induced breakdown spectroscopy measurements with ChemCam using emission lines of Martian dust spectra by Melikechi, N., Mezzacappa, A., Cousin, A., Lanza, N.L., Lasue, J., Clegg, S.M., Berger, G., Wiens, R.C., Maurice, S., Tokar, R.L., Bender, S., Forni, O., Breves, E.A., Dyar, M.D., Frydenvang, J., Delapp, D., Gasnault, O., Newsom, H., Ollila, A.M., Lewin, E., Clark, B.C., Ehlmann, B.L., Blaney, D., Fabre, C.

“…As part of the Mars Science Laboratory, the ChemCam instrument acquires remote laser induced breakdown spectra at distances that vary between 1.56m and 7m…”
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Global Distribution of Neutrons from Mars: Results from Mars Odyssey by Feldman, W. C., Boynton, W. V., Tokar, R. L., Prettyman, T. H., Gasnault, O., Squyres, S. W., Elphic, R. C., Lawrence, D. J., Lawson, S. L., Maurice, S., McKinney, G. W., Moore, K. R., Reedy, R. C.

“…Global distributions of thermal, epithermal, and fast neutron fluxes have been mapped during late southern summer/northern winter using the Mars Odyssey…”
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Plasma in Saturn's nightside magnetosphere and the implications for global circulation by McAndrews, H.J., Thomsen, M.F., Arridge, C.S., Jackman, C.M., Wilson, R.J., Henderson, M.G., Tokar, R.L., Khurana, K.K., Sittler, E.C., Coates, A.J., Dougherty, M.K.

“…We present a bulk ion flow map from the nightside, equatorial region of Saturn's magnetosphere derived from the Cassini CAPS ion mass spectrometer data. The…”
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Production, ionization and redistribution of O 2 in Saturn's ring atmosphere by Johnson, R.E., Luhmann, J.G., Tokar, R.L., Bouhram, M., Berthelier, J.J., Sittler, E.C., Cooper, J.F., Hill, T.W., Smith, H.T., Michael, M., Liu, M., Crary, F.J., Young, D.T.

“…Molecular oxygen produced by the decomposition of icy surfaces is ubiquitous in Saturn's magnetosphere. A model is described for the toroidal O 2 atmosphere…”
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Corrigendum to “Plasma in Saturn׳s nightside magnetosphere and the implications for global circulation” [Planet. Space Sci. 57(14–15) (2009) 1714–1722] by McAndrews, H.J., Thomsen, M.F., Arridge, C.S., Jackman, C.M., Wilson, R.J., Henderson, M.G., Tokar, R.L., Khurana, K.K., Sittler, E.C., Coates, A.J., Dougherty, M.K.

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Nonadiabatic electron heating at high-Mach-number perpendicular shocks by Tokar, R. L., Aldrich, C. H., Forslund, D. W., Quest, K. B.

“…Fully kinetic simulations of high-Mach-number (HMN) perpendicular collisionless shocks are described. It is shown that electron acceleration in the cross-shock…”
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Robust controller design of four wheel steering systems using /spl mu/ synthesis techniques by Xiaoming Gao, McVey, B.D., Tokar, R.L.

“…In this paper, a linearized four wheel steering (4WS) system model is deduced and then modified into a form which is appropriate for applying Matlab /spl mu/…”
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Resonator Mode Matcmng For Free-electron-laser Optical Guiding by Sun, K.C., McVey, B.D., Tokar, R.L.

“…The FELEX code is used to evaluate optical guiding in a grazing-incidence resonator at the Boeing FEL facility. The results indicate that a high-brightness…”
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Sideband suppression in free electron lasers using a grating rhomb by Tokar, R.L., McVey, B.D., Goldstein, J.C.

“…The phase shift produced by a grating rhomb is included in free-electron laser (FEL) pulse calculations to investigate whether or not grating rhombs can be…”
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Tests of a grazing-incidence ring resonator free-electron laser by Dowell, D.H., Laucks, M.L., Lowrey, A.R., Adamski, J.L., Pistoresi, D.J., Shoffstall, D.R., Bentz, M.P., Burns, R.H., Guha, J., Sun, K.C., Tomita, W., Lumpkin, A.H., Bender, S.C., Byrd, D., Tokar, R.L.

“…The authors describe operational experience of the first free-electron laser (FEL) using a grazing-incidence ring resonator. The Boeing FEL optical cavity was…”
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Simulations of a ring resonator free-electron laser by Tokar, R.L., McVey, B.D., Thode, L.E., Gallatin, G.M.

“…A relatively high gain ( approximately=25 to 40%) free-electron laser (FEL) with an optical ring resonator is simulated using the code FELEX. The laser system…”
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Improved Performance Of The Boeing/LANL Fel Experiment by Lumpkin, A.H., Tokar, R.L., Dowell, D.H., Lowrey, A.R., Yeremian, A.D., Justice, R.E.

“…We observed significant improvement in the performance of the Boeing/LANL free-electron laser (FEL) experiment in the last year. Some of the more graphic…”
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INEX Simulations Of The Boeing Fel System by Tokar, R.L., Young, L.M., Lumpkin, A.H., Mcvey, B.D., Thode, L.E., Bender, S.C., Chan, K.C.D., Yeremian, A.D., Dowell, D.H., Lowrey, A.R., Quimby, D.C.

“…The INEX (integrated numerical experiment) numerical model is applied to the 0.6 /spl mu/m FEL oscillator at the Boeing laboratory in Seattle, WA. This system…”
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Emittance measurements of FEL accelerators using optical transition radiation methods by Fiorito, R.B., Rule, D.W., Lumpkin, A.H., Tokar, R.L., Dowell, D.H., Sellyey, W.C., Lowrey, A.R.

“…Measurements of the emittance of the Boeing free electron laser accelerator operating at 107 MeV, were performed using optical transition radiation (OTR). The…”
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