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Journal Articles

High order harmonics from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Faenov, A. Y.*; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; Koga, J. K.; Mori, Michiaki; Kawase, Keigo*; et al.

RAL-TR-2015-025, P. 22, 2015/00

Journal Articles

High order harmonics from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T. A.*; Kawachi, Tetsuya; Sagisaka, Akito; et al.

New Journal of Physics (Internet), 16(9), p.093003_1 - 093003_30, 2014/09

 Times Cited Count:22 Percentile:20.08(Physics, Multidisciplinary)

Journal Articles

Instrumentation for diagnostics and control of laser-accelerated proton (ion) beams

Bolton, P.; Borghesi, M.*; Brenner, C.*; Carroll, D. C.*; De Martinis, C.*; Fiorini, F.*; Flacco, A.*; Floquet, V.*; Fuchs, J.*; Gallegos, P.*; et al.

Physica Medica; European Journal of Medical Physics, 30(3), p.255 - 270, 2014/05

 Times Cited Count:44 Percentile:14(Radiology, Nuclear Medicine & Medical Imaging)

Journal Articles

Relativistic high harmonic generation in gas jet targets

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

AIP Conference Proceedings 1465, p.167 - 171, 2012/07

 Times Cited Count:1 Percentile:48.59

Journal Articles

High-order harmonics from bow wave caustics driven by a high-intensity laser

Esirkepov, T. Z.; Pirozhkov, A. S.; Kando, Masaki; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

AIP Conference Proceedings 1465, p.172 - 180, 2012/07

 Times Cited Count:0 Percentile:100

The bow wave induced mechanism of high-order harmonics generation was discovered using simulations and catastrophe theory. This mechanism feasibility was successfully demonstrated in 3D and 2D PIC simulations. The mechanism and the simulations explained high-order harmonics in the XUV spectral region seen in recent experiments with terawatt lasers. Development of new XUV light and X-ray source based on the high-order harmonics generation mechanism is proposed.

Journal Articles

Soft-X-ray harmonic comb from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Kawachi, Tetsuya; Sagisaka, Akito; et al.

Physical Review Letters, 108(13), p.135004_1 - 135004_5, 2012/03

 Times Cited Count:59 Percentile:8.18(Physics, Multidisciplinary)

We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multi-terawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving $$mu$$J/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.

Journal Articles

Observation of plasma density dependence of electromagnetic soliton excitation by an intense laser pulse

Sarri, G.*; Kar, S.*; Romagnani, L.*; Bulanov, S. V.; Cecchetti, C. A.*; Galimberti, M.*; Gizzi, L. A.*; Heathcote, R.*; Jung, R.*; Kourakis, I.*; et al.

Physics of Plasmas, 18(8), p.080704_1 - 080704_4, 2011/10

 Times Cited Count:17 Percentile:33.48(Physics, Fluids & Plasmas)

Journal Articles

Coherent X-ray generation in relativistic laser - gas jet interactions

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.; Koga, J. K.; Kiriyama, Hiromitsu; et al.

Proceedings of SPIE, Vol.8140, p.81400A_1 - 81400A_16, 2011/10

Journal Articles

Observation of magnetized soliton remnants in the wake of intense laser pulse propagation through plasmas

Romagnani, L.*; Bigongiari, A.*; Kar, S.*; Bulanov, S. V.; Cecchetti, C. A.*; Esirkepov, T. Z.; Galimberti, M.*; Jung, R.*; Liseykina, T. V.*; Osterholz, J.*; et al.

Physical Review Letters, 105(17), p.175002_1 - 175002_4, 2010/10

 Times Cited Count:31 Percentile:18.42(Physics, Multidisciplinary)

Journal Articles

Tomography of an ultrafast laser driven proton source

Ter-Avetisyan, S.*; Schn$"u$rer, M.*; Nickles, P. V.*; Sandner, W.*; Borghesi, M.*; Nakamura, Tatsufumi; Mima, Kunioki*

Physics of Plasmas, 17(6), p.063101_1 - 063101_6, 2010/06

 Times Cited Count:7 Percentile:68.17(Physics, Fluids & Plasmas)

Using a multichannel Thomson spectrometer we have implemented a tomographic approach allowing the reconstruction of the emission characteristics of a laser driven proton source with high energy and spatial resolution. The results demonstrate the complexity of the temporal and spatial characteristics of such a source. The emitted proton beam, which is laminar and divergent ant high energies, becomes convergent at low energies. This implies that a fraction of the proton beam having this kinetic energy is emitted in a collimated way from the target at the turning point between these tow behaviors. Only a finite fraction of the target surface is contributing to the ion spectrum, which is measured at a specific angle within the beam cone. Therefore the momentum distribution of the protons in the emitted beam at any point in space can be controlled by determining the proton source area.

Journal Articles

Dependence of the ion energy on the parameters of the laser pulse and target in the radiation-pressure-dominated regime of acceleration

Echkina, E. Yu.*; Inovenkov, I. N.*; Esirkepov, T. Z.; Pegoraro, F.*; Borghesi, M.*; Bulanov, S. V.

Plasma Physics Reports, 36(1), p.15 - 29, 2010/01

Journal Articles

Dependence of the ion energy on the parameters of the laser pulse and target in the radiation-pressure-dominated regime of acceleration

Echkina, E. Yu.*; Inovenkov, I. N.*; Esirkepov, T. Z.; Pegoraro, F.*; Borghesi, M.*; Bulanov, S. V.

Plasma Physics Reports, 36(1), p.15 - 29, 2010/01

 Times Cited Count:9 Percentile:93.55(Physics, Fluids & Plasmas)

Journal Articles

Submicron ionography of nanostructures using a femtosecond- laser-driven-cluster-based source

Faenov, A. Y.; Pikuz, T. A.*; Fukuda, Yuji; Kando, Masaki; Kotaki, Hideyuki; Homma, Takayuki; Kawase, Keigo; Kameshima, Takashi*; Pirozhkov, A. S.; Yogo, Akifumi; et al.

Applied Physics Letters, 95(10), p.101107_1 - 101107_3, 2009/09

 Times Cited Count:25 Percentile:28.12(Physics, Applied)

Journal Articles

On the ion acceleration by high power electromagnetic waves in the radiation pressure dominated regime

Bulanov, S. V.; Esirkepov, T. Z.; Pegoraro, F.*; Borghesi, M.*

Comptes Rendus Physique, 10(2-3), p.216 - 226, 2009/03

 Times Cited Count:19 Percentile:27.09(Astronomy & Astrophysics)

Journal Articles

Superthermal and efficient-heating modes in the interaction of a cone target with ultraintense laser light

Nakamura, Hirotaka*; Chrisman, B.*; Tanimoto, Tsuyoshi*; Borghesi, M.*; Kondo, Kiminori; Nakatsutsumi, Motoaki*; Norimatsu, Takayoshi*; Tampo, Motonobu; Tanaka, Kazuo*; Yabuuchi, Toshinori*; et al.

Physical Review Letters, 102(4), p.045009_1 - 045009_4, 2009/01

 Times Cited Count:21 Percentile:25.11(Physics, Multidisciplinary)

Interactions between a relativistic-intensity laser pulse and a cone-wire target are studied by changing the focusing point of the pulse. The pulse, when focused on the sidewall of the cone, produced superthermal electrons with an energy $$>$$10 MeV, whereas less energetic electrons $$sim$$1 MeV were produced by the pulse when focused on the cone tip. Efficient heating of the wire was indicated by significant neutron signals observed when the pulse was focused on the tip. Particle-in-cell simulation results show reduced heating of the wire due to energetic electrons produced by specularly reflected light at the sidewall.

Journal Articles

Laser-driven proton acceleration; Source optimization and radiographic applications

Borghesi, M.*; Bigongiari, A.*; Kar, S.*; Macchi, A.*; Romagnani, L.*; Audebert, P.*; Fuchs, A.*; Toncian, T.*; Willi, O.*; Bulanov, S. V.; et al.

Plasma Physics and Controlled Fusion, 50(12), p.124040_1 - 124040_10, 2008/12

 Times Cited Count:45 Percentile:11.31(Physics, Fluids & Plasmas)

Journal Articles

Observation of collisionless shocks in laser-plasma experiments

Romagnani, L.*; Bulanov, S. V.; Borghesi, M.*; Audebert, P.*; Gauthier, J. C.*; L$"o$wenbr$"u$ck, K.*; Mackinnon, A. J.*; Patel, P.*; Pretzler, G.*; Toncian, T.*; et al.

Physical Review Letters, 101(2), p.025004_1 - 025004_4, 2008/07

 Times Cited Count:113 Percentile:4.53(Physics, Multidisciplinary)

Journal Articles

Highly efficient relativistic-ion generation in the laser-piston regime

Esirkepov, T. Z.; Borghesi, M.*; Bulanov, S. V.; Mourou, G.*; Tajima, Toshiki

Physical Review Letters, 92(17), p.175003_1 - 175003_4, 2004/04

 Times Cited Count:760 Percentile:0.23(Physics, Multidisciplinary)

An intense laser-plasma interaction regime of the generation of high density ultra-short relativistic ion beam is suggested. When the radiation pressure is dominant, the laser energy is transformed effciently into the energy of fast ions.

Oral presentation

High-speed ion beam generation from mass-less targets irradiated with ultra-intense laser light

Tampo, Motonobu; Fuchs, J.*; Kodama, Ryosuke*; Borghesi, M.*; Norimatsu, Takayoshi*

no journal, , 

no abstracts in English

Oral presentation

Observation of high-order harmonics produced by relativistic laser-plasma interaction

Kando, Masaki; Pirozhkov, A. S.; Esirkepov, T. Z.; Gallegos, P.*; Ahmed, H.*; Ragozin, E. N.*; Faenov, A.*; Pikuz, T.*; Kawachi, Tetsuya; Sagisaka, Akito; et al.

no journal, , 

When we focus laser pulses to the relativistic intensities (10$$^{18}$$ W/cm$$^2$$) in helium plasma, modulated spectra in the ultraviolet region (80- 300 eV) are observed in the forward direction. Some spectra contain odd and even high harmonics of the nearly fundamental frequency of the laser, continuum frequencies, and modulated structures. When we use a higher peak power laser (50-170 TW, 50fs), these spectral features are reproduced almost 100% probability. Also these spectra are observed when the laser polarization is changed to circular. The mechanism observed in our experiment is different from usual high-harmonics from gas targets, betatron radiation of electrons in wakefield, or nonlinear Thomson scattering due to above experimental conditions and results. We propose a theoretical model that electron density cusps formed by intense laser pulses radiate coherently. The validity of the model is confirmed with computer simulations.

36 (Records 1-20 displayed on this page)