Publications
312 results found
Santala MIK, Najmudin Z, Clark EL, et al., 2001, Observation of a hot high-current electron beam from a self-modulated laser wakefield accelerator, PHYSICAL REVIEW LETTERS, Vol: 86, Pages: 1227-1230, ISSN: 0031-9007
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- Citations: 107
Faure J, Marques JR, Malka V, et al., 2001, Dynamics of Raman instabilities using chirped laser pulses, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol: 63, Pages: 065401/1-065401/4, ISSN: 1539-3755
Measurements of Raman instabilities with subpicosecond time resolution in the referential frame of the laser pulse were carried out. It was found that Raman 30° side scattering and forward scattering occur at the back of the pulse. A simple model was developed that allows to calculate RFS spectra with a good accuracy.
Malka V, Faure J, Marquès JR, et al., 2001, Electron source produced in the self modulated laser wake field regime, 26th European Conference on Laser Interactions with Matter (ECLIM 2000), Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 446-451, ISSN: 0277-786X
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: 1122-1127, ISSN: 0093-3813
High-intensity laser-plasma interaction experiments were performed using high-power laser pulses (greater than 8 TW) at a wavelength of 527 nm. These pulses were focused to intensity greater than 1018 W/cm2 into underdense helium plasma at a density of ne < 5 x 1019 cm~3. Systematic examination of the forward Raman scattering instability was performed by measuring the spectrum of the forward scattered light. It was found that the three-wave instability occurs first, which then proceeds to a nonlinear regime involving four-wave processes. Measurements of the accelerated electron spectrum suggest that higher phase velocity plasma waves are generated than when using lower frequency light. l ©2000 IEEE.
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
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
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
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
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
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
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
Malka V, Coulaud C, Geindre JP, et al., 2000, Characterization of neutral density profile in a wide range of pressure of cylindrical pulsed gas jets, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 71, Pages: 2329-2333, ISSN: 0034-6748
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- Citations: 99
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.
Dorchies F, Amiranoff F, Malka V, et al., 1999, Acceleration of injected electrons in a laser wakefield experiment, PHYSICS OF PLASMAS, Vol: 6, Pages: 2903-2913, ISSN: 1070-664X
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- Citations: 54
DORCHIES F, AMIRANOFF F, BATON S, et al., 1999, Electron acceleration in laser wakefield experiment at Ecole Polytechnique, Laser and Particle Beams, Vol: 17, Pages: 299-305, ISSN: 0263-0346
<jats:p>An experiment has been performed with the LULI Multi-TeraWatt Laser. The acceleration of electrons injected in a plasma wave generated by the laser wakefield mechanism has been observed with a maximum energy gain of 1.5 MeV. It has been shown that the electrons deflected during the interaction, could scatter on the walls of the experimental chamber, and fake a high-energy signal. A special effort has been given in the electron detection to separate the accelerated electrons signal from the background noise.The experimental results agree with theoretical predictions and numerical simulations when 3D effects on the electron beam are taken into account.</jats:p>
Krushelnick K, Tatarakis M, Dangor AE, 1999, Multi MeV production from high intensity laser interactions with underdense plasmas, Physical Review Letters, Vol: 83, Pages: 737-740
Amiranoff F, Baton S, Bernard D, et al., 1999, Laser wakefield acceleration of electrons at ecole polytechnique, 8th Workshop on Advanced Accelerator Concepts, Publisher: AMER INST PHYSICS, Pages: 303-314, ISSN: 0094-243X
Dorchies F, Amiranoff F, Baton S, et al., 1999, Electron acceleration in laser wakefield experiment at Ecole Polytechnique, 25th European Conference on Laser Interaction with Matter (ECLIM), Publisher: CAMBRIDGE UNIV PRESS, Pages: 299-305, ISSN: 0263-0346
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- Citations: 3
Neely D, Danson CN, Allott R, et al., 1999, Frequency doubling of multi-terawatt picosecond pulses, 25th European Conference on Laser Interaction with Matter (ECLIM), Publisher: CAMBRIDGE UNIV PRESS, Pages: 281-286, ISSN: 0263-0346
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- Citations: 16
Neely D, Danson CN, Allott R, et al., 1999, Multi-terawatt frequency doubling of picosecond pulses for plasma interactions, 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, Pages: 414-423, ISSN: 0277-786X
Amiranoff F, Baton S, Bernard D, et al., 1998, Observation of laser wakefield acceleration of electrons, PHYSICAL REVIEW LETTERS, Vol: 81, Pages: 995-998, ISSN: 0031-9007
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- Citations: 214
Clayton CE, Tzeng KC, Gordon D, et al., 1998, Plasma wave generation in a self-focused channel of a relativistically intense laser pulse, PHYSICAL REVIEW LETTERS, Vol: 81, Pages: 100-103, ISSN: 0031-9007
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- Citations: 86
Amiranoff F, Bernard D, Cros B, et al., 1998, The laser wakefield acceleration experiment at Ecole Polytechnique, 13th Advanced ICFA Beam Dynamics Workshop / 1st ICFA Novel and Advanced Accelerator Workshop - The 2nd Generation Plasma Accelerators, Publisher: ELSEVIER SCIENCE BV, Pages: 364-366, ISSN: 0168-9002
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- Citations: 8
Gordon D, Tzeng KC, Clayton CE, et al., 1998, Observation of electron energies beyond the linear dephasing limit from a laser-excited relativistic plasma wave, Physical Review Letters, Vol: 80, Pages: 2133-2136
Clayton CE, Muggli P, Gordon D, et al., 1997, Observation of self-channeling of a relativistically-intense laser pulse in an underdense plasma, Pages: 514-515, ISSN: 1092-8081
Two approaches are used to extend the propagation distance of a very intense laser pulse well beyond a Rayleigh length xR in an underdense plasma. The first method injects the intense pulse into a preformed plasma fiber. The other one allows the intense pulse itself to create its own optical fiber by transversely modifying the refractive index of the plasma which occurs when the laser power exceed the critical power for relativistic self-guiding. Evidence of relativistic guiding is seen in images of either plasma recombination light or sidescattered pump light or its second harmonic.
Malka V, Modena A, Najmudin Z, et al., 1997, Second harmonic generation and its interaction with relativistic plasma waves driven by forward Raman instability in underdense plasmas, PHYSICS OF PLASMAS, Vol: 4, Pages: 1127-1131, ISSN: 1070-664X
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- Citations: 64
Amiranoff F, Antonetti A, Audebert P, et al., 1996, Laser particle acceleration: Beat-wave and wakefield experiments, 23rd European-Physical-Society Conference on Controlled fusion and Plasma Physics, Publisher: IOP PUBLISHING LTD, Pages: A295-A300, ISSN: 0741-3335
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- Citations: 10
Amiranoff F, Bernard D, Cros B, et al., 1996, A summary of the beatwave experiments at Ecole Polytechnique, International Workshop on 2nd-Generation Plasma Accelerators, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 296-300, ISSN: 0093-3813
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- Citations: 13
Modena A, Najmudin Z, Dangor AE, et al., 1996, Observation of Raman forward scattering and electron acceleration in the relativistic regime, International Workshop on 2nd-Generation Plasma Accelerators, Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Pages: 289-295, ISSN: 0093-3813
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- Citations: 65
Clayton CE, Marsh KA, Joshi C, et al., 1996, A broadband electron spectrometer and electron detectors for laser accelerator experiments, 16th Biennial Particle Accelerator Conference, Publisher: I E E E, Pages: 637-639
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- Citations: 2
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