Publications
284 results found
Spencer I, Ledingham KWD, Singhal RP, et al., 2001, High intensity laser generation of proton beams for the production of beta(+) sources used in Positron Emission Tomography, Melville, 10th international symposium on resonance ionization spectroscopy and its applications (ris-2000), Knoxville, Tennessee, 8 - 12 October 2000, Publisher: American Institute of Physics, Pages: 73-78
Spencer I, Ledingham KWD, Singhal RP, et al., 2001, High intensity laser generation of proton beams for the production of beta(+) sources used in Positron Emission Tomography, Melville, 10th international symposium on resonance ionization spectroscopy and its applications (ris-2000), Knoxville, Tennessee, 8 - 12 October 2000, Publisher: American Institute of Physics, Pages: 73-78
Krushelnick K, Clark E, Najmudin Z, et al., 2000, Diagnosis of peak laser intensity from high-energy ion measurements during intense laser interactions with underdense plasmas, LASER AND PARTICLE BEAMS, Vol: 18, Pages: 595-600, ISSN: 0263-0346
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- Citations: 3
Beg FN, Ross I, Lorenz A, et al., 2000, Study of x-ray emission from a table top plasma focus and its application as an x-ray backlighter, JOURNAL OF APPLIED PHYSICS, Vol: 88, Pages: 3225-3230, ISSN: 0021-8979
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- Citations: 92
Neely D, Allott RM, Clarke RJ, et al., 2000, Frequency doubling multi-terawatt sub-picosecond pulses for plasma interactions, ULIA-1 Conference, Publisher: CAMBRIDGE UNIV PRESS, Pages: 405-409, ISSN: 0263-0346
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- Citations: 9
Norreys PA, Allott R, Clarke RJ, et al., 2000, Experimental studies of the advanced fast ignitor scheme, PHYSICS OF PLASMAS, Vol: 7, Pages: 3721-3726, ISSN: 1070-664X
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- Citations: 105
Najmudin Z, Dangor AE, Modena A, et al., 2000, Investigation of a channeling high-intensity laser beam in underdense plasmas, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 28, Pages: 1057-1070, ISSN: 0093-3813
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- Citations: 16
Malka V, Faure J, Marquès JR, et al., 2000, Interaction of ultraintense laser pulses with an underdense, preformed plasma channel, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 28, Pages: 1078-1083, ISSN: 0093-3813
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- Citations: 6
Neely D, Collier JL, Allott R, et al., 2000, Proposed beatwave experiment at RAL with the Vulcan CPA laser, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 28, Pages: 1116-1121, ISSN: 0093-3813
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- Citations: 5
Krushelnick K, Clark EL, Allott R, et al., 2000, Ultrahigh-intensity laser-produced plasmas as a compact heavy ion injection source, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 28, Pages: 1184-1189, ISSN: 0093-3813
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- Citations: 139
Najmudin Z, Allott R, Amiranoff F, et al., 2000, Measurement of forward Raman scattering and electron acceleration from high-intensity laser-plasma interactions at 527 nm, IEEE TRANSACTIONS ON PLASMA SCIENCE, Vol: 28, Pages: 1084-1089, ISSN: 0093-3813
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- Citations: 8
Lebedev SV, Beg FN, Bland SN, et al., 2000, Effect of core-corona plasma structure on seeding of instabilities in wire array <i>Z</i> pinches, PHYSICAL REVIEW LETTERS, Vol: 85, Pages: 98-101, ISSN: 0031-9007
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- Citations: 153
Faure J, Malka V, Marquès JR, et al., 2000, Interaction of an ultra-intense laser pulse with a nonuniform preformed plasma, PHYSICS OF PLASMAS, Vol: 7, Pages: 3009-3016, ISSN: 1070-664X
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- Citations: 29
Christou C, Dangor AE, Hammer DA, 2000, Characterization of wire <i>x</i> pinches driven by a microsecond-long capacitive discharge, JOURNAL OF APPLIED PHYSICS, Vol: 87, Pages: 8295-8303, ISSN: 0021-8979
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- Citations: 31
Haines MG, Lebedev SV, Chittenden JP, et al., 2000, The past, present, and future of <i>Z</i> pinches, 41st Annual Meeting of the Division of Plasma Physics of the American-Physical-Society, Publisher: AIP Publishing, Pages: 1672-1680, ISSN: 1070-664X
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- Citations: 75
Krushelnick K, Clark EL, Zepf M, et al., 2000, Energetic proton production from relativistic laser interaction with high density plasmas, 41st Annual Meeting of the Division of Plasma Physics of the American-Physical-Society, Publisher: AIP Publishing, Pages: 2055-2061, ISSN: 1070-664X
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- Citations: 131
Lebedev SV, Aliaga-Rossel R, Bland SN, et al., 2000, Two different modes of nested wire array <i>Z</i>-pinch implosions, PHYSICAL REVIEW LETTERS, Vol: 84, Pages: 1708-1711, ISSN: 0031-9007
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- Citations: 69
Santala MIK, Zepf M, Watts I, et al., 2000, Effect of the plasma density scale length on the direction of fast electrons in relativistic laser-solid interactions, PHYSICAL REVIEW LETTERS, Vol: 84, Pages: 1459-1462, ISSN: 0031-9007
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- Citations: 203
Ledingham KWD, Spencer I, McCanny T, et al., 2000, Photonuclear physics when a multiterawatt laser pulse interacts with solid targets, PHYSICAL REVIEW LETTERS, Vol: 84, Pages: 899-902, ISSN: 0031-9007
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- Citations: 233
Clark EL, Krushelnick K, Davies JR, et al., 2000, Measurements of energetic proton transport through magnetized plasma from intense laser interactions with solids, PHYSICAL REVIEW LETTERS, Vol: 84, Pages: 670-673, ISSN: 0031-9007
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- Citations: 685
Haines MG, Lebedev SV, Chittenden JP, et al., 2000, The past, present, and future of [formula omitted] pinches, Physics of Plasmas, Vol: 7, Pages: 1672-1680, ISSN: 1070-664X
The Z pinch is enjoying a renaissance as the world's most powerful yet efficient soft x-ray source which can energize large volume hohlraums for indirectly driven inertial confinement fusion. It has the advantages of being efficient and having high energy and power density. Its early history will be traced from the 18th century to the present day. The most notable feature of the Z pinch is its instability. The various regimes of stability analysis will be reviewed, including resistive and finite ion Larmor radius effects. Work in the last 10 years on single fibres, especially of cryogenic deuterium, gave neutrons that were of the same origin, namely, beam–plasma interactions, as reported by Kurchatov. The renaissance has come about through the implosion of arrays of fine wires. Research at Sandia National Laboratory has shown that by using more and finer wires, the x-ray radiation emitted at stagnation increased in power and decreased in pulse width. The understanding of these results has been advanced considerably by theory, simulation and smaller-scale, well diagnosed experiments showing the early uncorrelated [formula omitted] instabilities on each wire, the inward jetting of plasma to the axis, the global Rayleigh–Taylor instability and the mitigating effect of nested arrays. © 2000, American Institute of Physics. All rights reserved.
Lebedev SV, Chittenden JP, Bland SN, et al., 2000, Plasma formation and seeding of Rayleigh-Taylor instabilities in wire array z-pinches, IEEE International Conference on Plasma Science, ISSN: 0730-9244
X-ray radiography with high temporal (approximately lns) and spatial (approximately 20 μm) resolution was used to study implosion dynamics of wire array Z-pinch in experiments on the 1.4 MA, 240 ns MAGPIE facility. Comparison of laser probing and x-ray radiography data shows that the plasma formed from the wires has a heterogeneous structure, with a low density corona surrounding the dense wire cores. Non-uniform sweeping of the coronal plasma by the global J×B force from the wires towards the array axis produces both mass perturbations in the wire cores and a precursor column on the axis. The spatial scale of these perturbations, which act as seeding for the global m = 0 mode of the Rayleigh-Taylor instability, is determined by the size of wire cores (0.25 mm for Al and 0.1 mm for W). A qualitative change in the implosion dynamics (transition to 0-D-like implosion trajectory) was observed in Al arrays when the ratio of inter-wire gap to the wire core size decreased to approximately 3. This probably explains the existence of `critical' inter-wire gap, below which a significant rise in x-ray power was observed in experiments at Sandia National Lab. Experimental data on `nested' wire array implosions will be presented, which show significant sharpening of the X-ray pulse in different dynamic modes of the interaction between the two arrays.
Collier JL, Neely D, Allott R, et al., 2000, Simultaneous dual wavelength CPA operation of the vulcan laser for particle acceleration experiments
A chirped pulse amplification laser configuration capable of particle acceleration through the driving of a plasma beatwave into saturation before modulation instabilities can grow is reported. The configuration is based on generating a single sub-ps, broad bandwidth pulse (approximately 16 nm) and stretching and filtering to select two wavelength components (separation approximately 7 nm). The two spectral components are temporally stretched (to >100 ps) and separated (by approximately 1 ns). The pulses are then amplified in a single Nd:glass chain to greater than 15 J per pulse. Using a single pass reflective grating compressor the pulses are temporally compressed to between 2 and 5 ps and automatically synchronized. Moreover, the system is capable of introducing a chirp into the actual beat, such that the compressed pulses can compensate for relativistic detuning of the plasma wave. The optimum laser amplification and recombination configuration for generating a saturated laser driven beatwave is presented and options for future work discussed.
Tatarakis M, Zepf M, Beg FN, et al., 2000, Energetic heavy ion and proton generation from ultra-intense laser-plasma interactions with solids, Physical Review Letters, Vol: 85, Pages: 1654-1657
Krushelnick K, Zepf M, Tatarakis M, et al., 2000, Energetic protonproduction from relativistic laser interaction with high density plasmas, Physics of Plasmas, Vol: 7
Lebedev SV, Aliaga-Rossel R, Bland SN, et al., 1999, Physics of wire array Z-pinch implosions: Experiments on magpie generator, IEE Colloquium (Digest), ISSN: 0963-3308
Lebedev SV, Aliaga-Rossel R, Bland SN, et al., 1999, Effect of wire material on plasma formation in wire array z-pinches, ISSN: 0730-9244
Plasma formation in wire array z-pinches was studied in experiments with 16-mm diameter arrays of between 8 and 64 aluminum, tungsten or titanium wires, imploded in 200 to 260 ns by a 1.4 MA current pulse. Side-on (r-z plane) diagnostics included laser probing with interferometer, schlieren and shadow channels, gated 4-frame soft x-ray imaging and radial and axial optical streak photography. End-on (r-θ plane) laser probing gave information about the azimuthal structure of the implosion. The x-ray radiation at stagnation and during the implosion phase was measured with filtered PCD and XRD detectors. A comparison of plasma formation for different wire material will be presented, including measurements of the expansion velocities of the coronal plasma in the radial and azimutal directions, the wavelength of instabilities and the parameters of the precursor pinch.
Lebedev SV, Aliaga-Rossel R, Bland SN, et al., 1999, Study of Rayleigh-Taylor instability growth in wire array z-pinch experiments, ISSN: 0730-9244
Wire array z-pinches are extremely efficient sources of high power soft x-ray pulses (up to 280 TW) for energizing hohlraums for inertial confinement fusion and other high energy density physics applications. The main processe affecting quality of the implosion and x-ray power at stagnation is development of the Rayleigh-Taylor instability in a plasma accelerated by the magnetic pressure. In this paper we present experimental results on Rayleigh-Taylor instability growth in wire array z-pinches driven by a 1.4 MA, 240 ns current pulse. Al, W and Ti wire arrays of 16 mm diameter with between 8 and 64 wires were studied. Comparison of the instability development for different wire material and wire number will be presented. The radial structure of the instability was observed by laser probing and soft x-ray imaging in implosions of arrays consisting of four groups of four closely spaced wires (4×4 wire array). Experiments to study the instability development in nested-wire arrays and effect of the Bz magnetic field induced by wires twisting will be presented.
Ruiz-Camacho J, Beg FN, Dangor AE, et al., 1999, Z-pinch discharges in aluminum and tungsten wires, PHYSICS OF PLASMAS, Vol: 6, Pages: 2579-2587, ISSN: 1070-664X
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- Citations: 32
Lebedev SV, Aliaga-Rossel R, Bland SN, et al., 1999, The dynamics of wire array Z-pinch implosions, 40th Annual Meeting of the Division of Plasma Physics of the American-Physical-Society, Publisher: AIP Publishing, Pages: 2016-2022, ISSN: 1070-664X
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- Citations: 114
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