Zobrazeno 1 - 10
of 45
pro vyhledávání: '"J. A. Antoniades"'
Autor:
Jeffrey H. Bowles, Carl L. Siefring, Richard F. Fernsler, J. A. Antoniades, William E. Amatucci, M. J. Keskinen, David N. Walker
Publikováno v:
Journal of Geophysical Research: Space Physics. 104:12473-12485
We describe experimental and theoretical research related to the mitigation of spacecraft charging by the release of neutral gas through specially designed nozzles. The experiments were conducted in the large Space Physics Simulation Chamber (SPSC) a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90f879f35cb7ff0167f3bfaeddec5073
https://doi.org/10.1029/1998ja900172
https://doi.org/10.1029/1998ja900172
Autor:
J. A. Antoniades, Curtiss O. Davis, Mary E. Kappus, M Czarnaski, Jeffrey H. Bowles, Mark M. Baumback, John M. Grossmann
Publikováno v:
Metrologia. 35:657-661
We demonstrate the calibration and error estimation for three inexpensive pushbroom imaging spectrometers that operate in the visible/near-infrared range. The instruments were all built at the Naval Research Laboratory from commercial, off-the-shelf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7beb4dcd22da73305692181615d4daf6
https://doi.org/10.1088/0026-1394/35/4/74
https://doi.org/10.1088/0026-1394/35/4/74
Autor:
Gurudas Ganguli, Mark Koepke, J. A. Antoniades, David N. Walker, Jeffrey H. Bowles, William E. Amatucci, D. Duncan, Valeriy V. Gavrishchaka
Publikováno v:
Journal of Geophysical Research: Space Physics. 103:11711-11724
Recent sounding rocket experiments, such as SCIFER, AMICIST, and ARCS-4, and satellite data from FAST, Freja, DE-2, and HILAT, provide compelling evidence of a correlation between small-scale spatial plasma inhomogeneities, broadband low-frequency wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::117485337eb9845d2cab8142eac25bcd
https://doi.org/10.1029/98ja00659
https://doi.org/10.1029/98ja00659
Autor:
J. A. Antoniades, David N. Walker, D. Duncan, Mark Koepke, Valeriy V. Gavrishchaka, William E. Amatucci, Jeffrey H. Bowles, Gurudas Ganguli
Publikováno v:
Geophysical Research Letters. 24:1187-1190
Perpendicular ion heating resulting from velocity-shear-driven ion-cyclotron waves has been measured for the first time. The experiment was performed in the Naval Research Laboratory's Space Physics Simulation Chamber (SPSC) under plasma conditions a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ff71b0200e5b49e1cba3e77033650ac
https://doi.org/10.1029/97gl01102
https://doi.org/10.1029/97gl01102
Publikováno v:
Journal of Applied Physics. 80:4249-4257
The propagation of intense, relativistic electron beams in air is subject to the resistive hose instability. Conditioning the beam prior to injecting it into the air can extend its range by reducing the hose growth rate and by reducing the initial sp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aed1fa24ac9a6fb455833e81464c0268
https://doi.org/10.1063/1.363384
https://doi.org/10.1063/1.363384
Autor:
Richard F. Fernsler, D. P. Murphy, Richard F. Hubbard, J. A. Antoniades, R. A. Meger, M.C. Myers
Publikováno v:
Journal of Applied Physics. 80:4258-4267
An intense relativistic electron beam injected into dense gas characteristically propagates in a self‐pinched mode but is susceptible to the resistive hose instability. This convective instability typically leads to large amplitude beam motion and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bdebd1d6ff9663ecd4811feb23d57ead
https://doi.org/10.1063/1.363385
https://doi.org/10.1063/1.363385
Publikováno v:
Review of Scientific Instruments. 67:455-461
We report on the design, construction, and use of a large cavity microwave plasma source. The source is designed to provide a range of space‐plasma‐like conditions in the Naval Research Laboratory Space Physics Simulation Chamber. A new feature o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cc1baed9669e3927dc2658f6aa810b83
https://doi.org/10.1063/1.1146612
https://doi.org/10.1063/1.1146612
Autor:
D. P. Murphy, Richard F. Fernsler, M.C. Myers, J. A. Antoniades, Richard F. Hubbard, R. A. Meger
Publikováno v:
Journal of Applied Physics. 78:3580-3591
Conducting tubes filled with neutral gas at pressures between 0.001 and 0.1 Torr can be used to transport, to center, and to reduce the transverse oscillations of high current (≳10 kA) electron beams. Electron impact ionization of the gas leads to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b0e4db34c0af86ff62ea09288ebf9d0b
https://doi.org/10.1063/1.359933
https://doi.org/10.1063/1.359933
Publikováno v:
Review of Scientific Instruments. 66:4681-4689
We present a method for measuring large changes in the electrical potential of a spacecraft. It is known that a spacecraft in the ionosphere can obtain voltages as large as a few kilovolts. Spacecraft charging can occur naturally in the auroral regio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f1359e8137bbaa47636a6dc7de25f4e
https://doi.org/10.1063/1.1145307
https://doi.org/10.1063/1.1145307
Autor:
Robert A. Meger, T. A. Peyser, R. E. Pechacek, D.P. Murphy, J. A. Antoniades, Martin Lampe, M.C. Myers
Publikováno v:
Review of Scientific Instruments. 62:2895-2903
A multi‐element segmented concentric Faraday collector has been developed for measuring the time evolution of the beam half‐current radius (a1/2) of an intense relativistic electron beam. Each collector segment measures the total current within i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6a5ee919455179be97a37f3b5c47c18d
https://doi.org/10.1063/1.1142178
https://doi.org/10.1063/1.1142178