Výsledky vyhledávání - "J. B. A. Palmer"

Quantitative Measurements of Wire Ablation in Tungsten $X$-pinches at 80 kA

Autor: D. J. Ampleford, Utako Ueda, S.C. Bott, Sergey Lebedev, S. N. Bland, D. M. Haas, Farhat Beg, J. B. A. Palmer, Geoffrey Hall, Yossof Eshaq, J. P. Chittenden

Publikováno v: IEEE Transactions on Plasma Science. 36:2759-2764

This paper investigates the ablation of wires in two-wire tungsten X -pinches driven by an 80-kA current over 50 ns. High-resolution imaging using a Nomarski interferometer allows measurements close to the X-pinch cross point, where the ablation ldqu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ef6b0022362b6027a25a12637d804856
https://doi.org/10.1109/tps.2008.2003964

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The Formation of Precursor Structures in Cylindrical and '4 $\times$ 4' Wire Arrays

Autor: F.A.S. Vidal, J. P. Chittenden, Geoffrey Hall, S. C. Bott, Sergey Lebedev, J. B. A. Palmer, Alberto Marocchino, Simon Bland, D. J. Ampleford, Christopher Jennings

Publikováno v: IEEE Transactions on Plasma Science. 35:165-170

This paper summarizes observations of precursor-column formation in cylindrical wire arrays on the 1-MA MAGPIE generator at Imperial College London. Direct experimental measurements of the diameter variation during the collapse and formation phase of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::635928e52665bd932496d124e00c6667
https://doi.org/10.1109/tps.2007.893253

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Physics of wire array Z-pinch implosions: experiments at Imperial College

Autor: C. A. Jennings, Gareth Hall, J. B. A. Palmer, Theodoros Christoudias, M. G. Haines, Simon C. Bott, Jerry Chittenden, Simon Bland, Sergey Lebedev, S. A. Pikuz, David J. Ampleford, J Goyer, T. A. Shelkovenko, David Hammer

Publikováno v: Plasma Physics and Controlled Fusion. 47:A91-A108

A review of recent experiments on the MAGPIE generator (1 MA, 250 ns) aimed at studying the implosion dynamics of wire array Z-pinches is presented. The first phase of implosion is dominated by the gradual ablation of stationary wire cores and gradua

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4108538497922ff6542db169b98918df
https://doi.org/10.1088/0741-3335/47/5a/009

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Implosion dynamics of wire array Z-pinches: experiments at Imperial College

Autor: Simon C. Bott, J. Rapley, M. G. Haines, Sergey Lebedev, C. A. Jennings, Simon Bland, J. B. A. Palmer, Jerry Chittenden, David J. Ampleford

Publikováno v: Nuclear Fusion. 44:S215-S220

We report on experiments on the MAGPIE generator (1 MA, 250 ns) to study the physics of plasma formation in wire array Z-pinches. It is shown that the gradual redistribution of the array mass by the precursor plasma flow from wire cores plays a very

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::422bba517f7d31d1ae2c0bc11207534f
https://doi.org/10.1088/0029-5515/44/12/s12

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Chemically etched modulation in wire radius for wire array Z-pinch perturbation studies

Autor: J. Rapley, D. K. Lobley, Brent Manley Jones, Geoffrey Hall, D. J. Ampleford, J. B. A. Palmer, J. P. Ramacciotti, A. E. Griego, J. E. Garrity, K. L. Martin, Simon Bland, C. Deeney, S. C. Bott, Sergey Lebedev, John Lee McKenney

Publikováno v: Review of Scientific Instruments. 75:5030-5034

A technique for manufacturing wires with imposed modulation in radius with axial wavelengths as short as 1 mm is presented. Extruded aluminum 5056 with 15 μm diameter was masked and chemically etched to reduce the radius by ∼20% in selected region

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c2f9053e3ff74369b73cbdbd04a6e25c
https://doi.org/10.1063/1.1808371

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Use of X-pinches of diagnose behavior of low density CH foams on axis of wire array Z-pinches

Autor: Simon C. Bott, J. B. A. Palmer, Jerry Chittenden, Simon Bland, Sergey Lebedev, David J. Ampleford

Publikováno v: Review of Scientific Instruments. 75:3944-3946

X-pinch radiography was used to analyze the interaction between streams of coronal plasma and on-axis foam targets in wire array z-pinch experiments on the MAGPIE generator (1 MA,240 ns). The implosion of the x-pinch, used in place of a current retur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00a636ca8089708c5b50f813846a83a0
https://doi.org/10.1063/1.1787927

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Extreme ultraviolet imaging of wire array z-pinch experiments

Autor: J. B. A. Palmer, S. A. Pikuz, T. A. Shelkovenko, Simon Bland, D. J. Ampleford, S. C. Bott, Sergey Lebedev

Publikováno v: Review of Scientific Instruments. 75:3941-3943

A multi-frame extreme ultraviolet imaging system based on four pinhole cameras, each backed by a gated microchannel plate (MCP) detector, was used to analyze plasma formation and dynamics in wire array z-pinch experiments on the MAGPIE generator (1 M

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6dd745bb1e35f2cb791a8c3ef6954ed
https://doi.org/10.1063/1.1787926

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Serevent nationwide surveillance study: comparison of salmeterol with salbutamol in asthmatic patients who require regular bronchodilator treatment

Autor: J B D Palmer, R W Fuller, J R Hall, W M Castle

Publikováno v: BMJ. 306:1034-1037

OBJECTIVE--To compare safety of salmeterol and salbutamol in treating asthma. DESIGN--Double blind, randomised clinical trial in parallel groups over 16 weeks. SETTING--General practices throughout the United Kingdom. SUBJECTS--25,180 patients with a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93827e390eca1c834efff1e8a71cd01d
https://doi.org/10.1136/bmj.306.6884.1034

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Twelve month comparison of salmeterol and salbutamol as dry powder formulations in asthmatic patients. European Study Group

Autor: D. W. Rawlinson, J. B. D. Palmer, Bo Lundbäck

Publikováno v: Thorax. 48:148-153

BACKGROUND: Salmeterol is a potent selective beta 2 agonist that has been shown to have a duration of action in excess of 12 hours. In this study salmeterol and salbutamol were compared over a three month period with a further extension of nine month

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2023a1a8ff93980959c4f35bb448d9b8
https://doi.org/10.1136/thx.48.2.148

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