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論文

Enhancement of maximum attainable ion energy in the radiation pressure acceleration regime using a guiding structure

Bulanov, S. S.*; Esarey, E.*; Schroeder, C. B.*; Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Pegoraro, F.*; Leemans, W. P.*

Physical Review Letters, 114(10), p.105003_1 - 105003_5, 2015/03

AA2014-0849.pdf:0.58MB

 被引用回数:26 パーセンタイル:82.5(Physics, Multidisciplinary)

It is shown that there is a fundamental limit on the maximum attainable ion energy, which is determined by the group velocity of the laser.

論文

Phase space dynamics after the breaking of a relativistic Langmuir wave in a thermal plasma

Grassi, A.*; Fedeli, L.*; Macchi, A.*; Bulanov, S. V.; Pegoraro, F.*

European Physical Journal D, 68(6), p.178_1 - 178_8, 2014/06

 被引用回数:8 パーセンタイル:45.93(Optics)

The relativistic Vlasov equation is integrated numerically in order to investigate the phase space development of the wave break of a relativistic Langmuir wave in a thermal plasma. Relativistic effects lead to a differential retardation in the time required by the electrons to evolve in phase space, the largest momentum electron staking the longest time. This leads to the formation of long lasting spikes in momentum space at the wave break position that propagates with a velocity close to the speed of light and to extremely steep density jumps in coordinate space.

論文

Strong field electrodynamics of a thin foil

Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Bulanov, S. S.*; Rykovanov, S. G.*; Pegoraro, F.*

Physics of Plasmas, 20(12), p.123114_1 - 123114_13, 2013/12

 被引用回数:27 パーセンタイル:80.57(Physics, Fluids & Plasmas)

Exact solutions describing the nonlinear electrodynamics of a thin double layer foil are presented. These solutions correspond to a broad range of problems of interest for the interaction of high intensity laser pulses with overdense plasmas, such as frequency upshifting, high order harmonic generation, and high energy ion acceleration.

論文

On the breaking of a plasma wave in a thermal plasma, 1; The Structure of the density singularity

Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Koga, J. K.; Pirozhkov, A. S.; 中村 龍史; Bulanov, S. S.*; Schroeder, C. B.*; Esarey, E.*; Califano, F.*; et al.

Physics of Plasmas, 19(11), p.113102_1 - 113102_14, 2012/11

 被引用回数:16 パーセンタイル:60.35(Physics, Fluids & Plasmas)

The structure of the singularity that is formed in a relativistically large amplitude plasma wave close to the wave breaking limit is found by using a simple waterbag electron distribution function. The electron density distribution in the breaking wave has a typical "peakon" form. The maximum value of the electric field in a thermal breaking plasma is obtained and compared to the cold plasma limit. The results of computer simulations for different initial electron distribution functions are in agreement with the theoretical conclusions.

論文

On the breaking of a plasma wave in a thermal plasma, 2; Electromagnetic wave interaction with the breaking plasma wave

Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Koga, J. K.; Pirozhkov, A. S.; 中村 龍史; Bulanov, S. S.*; Schroeder, C. B.*; Esarey, E.*; Califano, F.*; et al.

Physics of Plasmas, 19(11), p.113103_1 - 113103_7, 2012/11

 被引用回数:13 パーセンタイル:53.19(Physics, Fluids & Plasmas)

The structure of the density singularity formed in a relativistically large amplitude plasma wave close to the wave breaking limit leads to a refraction coefficient which has a coordinate dependence with discontinuous derivatives. This results in a non-exponentially small above-barrier reflection of an electromagnetic wave interacting with the nonlinear plasma wave.

論文

Ion acceleration from thin foil and extended plasma targets by slow electromagnetic wave and related ion-ion beam instability

Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Pegoraro, F.*; Bulanov, S. S.*; Geddes, C. G. R.*; Schroeder, C. B.*; Esarey, E.*; Leemans, W. P.*

Physics of Plasmas, 19(10), p.103105_1 - 103105_10, 2012/10

 被引用回数:29 パーセンタイル:80.26(Physics, Fluids & Plasmas)

When the ions are accelerated by the radiation pressure of the laser pulse, their velocity can not exceed the laser group velocity, in the case when it is less than the speed of light in vacuum. This is demonstrated in two cases corresponding to the thin foil target irradiated by a high intensity laser light and to the hole boring by the laser pulse in the extended plasma accompanied by the collisionless shock wave formation. It is found that the beams of accelerated at the collisionless shock wave front ions are unstable against the Buneman-like and the Weibel-like instabilities which result in the ion energy spectrum broadening.

論文

Phase-locked ions and foil transparency in the radiation pressure acceleration regime

Pegoraro, F.*; Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Echkina, E.*; Inovenkov, I. N.*; Korn, G.*

Nuclear Instruments and Methods in Physics Research A, 653(1), p.153 - 155, 2011/10

The transverse expansion of a thin foil accelerated in the RPDA regime can be exploited in order to increase the ion energy and the acceleration efficiency at the expense of decreasing the number of accelerated particles. In the relativistic regime, the ions become phase-locked with respect to the electromagnetic wave. The use of an optimal laser pulse shape makes it possible to keep the expanding foil opaque to the laser radiation. This provides a new approach in order to enhance the energy of laser accelerated ions significantly.

論文

Phase-locked ions and foil transparency in the radiation pressure acceleration regime

Pegoraro, F.*; Bulanov, S. V.; Esirkepov, T. Z.; 神門 正城; Echkina, E. Yu.*; Inovenkov, I. N.*; Korn, G.*

Nuclear Instruments and Methods in Physics Research A, 653(1), p.153 - 155, 2010/10

 被引用回数:2 パーセンタイル:20.73(Instruments & Instrumentation)

The transverse expansion of a thin foil accelerated in the RPDA regime can be exploited in order to increase the ion energy and the acceleration efficiency at the expense of decreasing the number of accelerated particles. In the relativistic regime, the ions become phase-locked with respect to the electromagnetic wave.

論文

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

 被引用回数:37 パーセンタイル:83.13(Physics, Multidisciplinary)

Slowly evolving, regularly spaced patterns have been observed in proton projection images of plasma channels drilled by intense laser pulses propagating in an ionized gas jet. The analysis suggests the formation of rows of magnetized soliton remnants, with a quasistatic magnetic field associated with vortex like electron currents resembling those of magnetic vortices.

論文

Unlimited energy gain in the laser-driven radiation pressure dominant acceleration of ions

Bulanov, S. V.; Echkina, E. Yu.*; Esirkepov, T. Z.; Inovenkov, I. N.*; 神門 正城; Pegoraro, F.*; Korn, G.*

Physics of Plasmas, 17(6), p.063102_1 - 063102_12, 2010/06

 被引用回数:34 パーセンタイル:80.32(Physics, Fluids & Plasmas)

The energy of the ions accelerated by an intense electromagnetic wave in the radiation pressure dominated regime can be greatly enhanced by a transverse expansion of a thin target. The expansion decreases the number of accelerated ions in the irradiated region increasing the energy and the longitudinal velocity of the remaining ions. In the relativistic limit, the ions become phase-locked with respect to the electromagnetic wave resulting in an unlimited ion energy gain. This effect and the use of optimal laser pulse shape provide a new approach for great enhancing the energy of laser accelerated ions.

論文

Unlimited ion acceleration by radiation pressure

Bulanov, S. V.; Echkina, E. Yu.*; Esirkepov, T. Z.; Inovenkov, I. N.*; 神門 正城; Pegoraro, F.*; Korn, G.*

Physical Review Letters, 104(13), p.135003_1 - 135003_4, 2010/04

 被引用回数:135 パーセンタイル:96.09(Physics, Multidisciplinary)

The energy of ions accelerated by an intense electromagnetic wave in the radiation pressure dominated regime can be greatly enhanced due to a transverse expansion of a thin target. The expansion decreases the number of accelerated ions in the irradiated region resulting in an increase in the ion energy and in the ion longitudinal velocity. In the relativistic limit, the ions become phase locked with respect to the electromagnetic wave resulting in unlimited ion energy gain.

論文

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

When the laser pulse radiation pressure is dominant, the efficiency of the laser energy transformation into the energy of relativistic ions is very high. The energy and luminosity scalings in the RPDA regime are presented.

論文

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

 被引用回数:13 パーセンタイル:11.29(Physics, Fluids & Plasmas)

When the dominant mechanism for ion acceleration is the laser radiation pressure, the conversion efficiency of the laser energy into the energy of relativistic ions may be very high. Stability analysis of a thin plasma layer accelerated by the radiation pressure shows that Raleigh-Taylor instability may enhance plasma inhomogeneity. In the linear stage of instability, the plasma layer decays into separate bunches, which are accelerated by the radiation pressure similarly to clusters accelerated under the action of an electromagnetic wave. The energy and luminosity of an ion beam accelerated in the radiation pressure dominated regime a calculated.

論文

Relativistic laser-matter interaction and relativistic laboratory astrophysics

Bulanov, S. V.; Esirkepov, T. Z.; Habs, D.*; Pegoraro, F.*; 田島 俊樹*

European Physical Journal D, 55(2), p.483 - 507, 2009/11

 被引用回数:101 パーセンタイル:81.16(Optics)

The paper is devoted to the prospects of using the laser radiation interaction with plasmas in the laboratory relativistic astrophysics context. We discuss the dimensionless parameters characterizing the processes in the laser and astrophysical plasmas and emphasize a similarity between the laser and astrophysical plasmas in the ultra relativistic energy limit. In particular, we address basic mechanisms of the charged particle acceleration, the collisionless shock wave and magnetic reconnection and vortex dynamics properties relevant to the problem of ultrarelativistic particle acceleration.

論文

Stability of a plasma foil in the radiation pressure dominated regime

Pegoraro, F.*; Bulanov, S. V.

European Physical Journal D, 55(2), p.399 - 405, 2009/11

 被引用回数:5 パーセンタイル:30.69(Optics)

The stability of a thin plasma foil accelerated to relativistic velocities by the radiation pressure of an ultra high intensity electromagnetic pulse is investigated. The effects of the onset of a Rayleigh-Taylor-like instability are discussed in the context of the ion acceleration process during the interaction of the laser pulse with the plasma. It is stressed that the experimental study of this advanced laser plasma interaction regime will be accessible within the framework of the ELI experiment and will be of relevance for our understanding of high energy astrophysical phenomena.

論文

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

 被引用回数:20 パーセンタイル:72.1(Astronomy & Astrophysics)

The paper presents theoretical analysis and computer simulations of the laser ion acceleration with thin targets.

論文

Ion acceleration and stability in the radiation pressure dominated regime

Pegoraro, F.*; Bulanov, S. V.

Laser Physics, 19(2), p.222 - 227, 2009/02

 被引用回数:7 パーセンタイル:38.89(Optics)

We investigate the stability against the onset of Rayleigh-Taylor modes of a thin plasma foil accelerated by the radiation pressure. We are interested in the process of ion acceleration in the interaction between a plasma foil and an ultra-intense laser pulse in the so-called radiation pressure dominated regime. We show that in the relativistic regime the Rayleigh-Taylor instability develops more slowly than in the non-relativistic regime. We show that the onset of the Rayleigh-Taylor-like instability leads to the formation of high-density, high-energy plasma clumps and to a relatively higher rate of ion acceleration in the regions between the clumps.

論文

Bandwidth enhancement for parametric amplifiers operated in chirped multi-beam mode

Terranova, F.*; 桐山 博光; Pegoraro, F.*

Optics Communications, 281(19), p.4993 - 4997, 2008/10

 被引用回数:4 パーセンタイル:25.9(Optics)

OPCPAの増幅スペクトル幅の拡大を目的として理論的な評価をしている。シグナル光を2つに分離し、位相整合条件をわずかに変化させた2つのOPCPAにてそれぞれ増幅する。このような構成にすることで、一方のOPCPAで短波長側のシグナル光成分を増幅し、もう一方のOPCPAで長波長側のシグナル光成分を増幅することが可能となる。最後に増幅された2つのシグナルビームを重ね合わせることで、シングルビームのOPCPAに必要な大型の非線形光学結晶,大型のポンプレーザーを用いることなしに、高エネルギーでかつ広いスペクトル帯域の増幅が可能であることを理論的に示した。

論文

Photon bubbles and ion acceleration in a plasma dominated by the radiation pressure of an electromagnetic pulse

Pegoraro, F.*; Bulanov, S. V.

Physical Review Letters, 99(6), p.065002_1 - 065002_4, 2007/08

 被引用回数:235 パーセンタイル:98.23(Physics, Multidisciplinary)

高強度レーザーをプラズマ中に集光することにより、プラズマの薄片を加速することができる。高強度電磁パルスの放射圧により加速したプラズマの薄片の安定性について、理論及び粒子シミュレーションにより調べた。Rayleigh-Taylorのような不安定性が、薄片を横方向へ圧縮し横方向の広がりを抑制する。その横方向の圧縮は、イオンを縦方向に広げ、高速イオンのエネルギースペクトルに広がりをもたらすことを見いだした。

論文

Novel acceleration techniques for the physics of massive neutrinos

Terranova, F.*; Bulanov, S. V.; Esirkepov, T. Z.; 桐山 博光; 田島 俊樹; Collier, J. L.*; Migliozzi, P.*; Pegoraro, F.*

International Journal of Modern Physics B, 21(3&4), p.351 - 360, 2007/02

来たるべき10年の間に、質量のあるニュートリノの物理は従来の加速器技術ではなく、今までない新規技術により開拓されるものと考えている。ここでは、新しいニュートリノソースによるニュートリノ振動研究を推進するのではなく、レーザー生成プラズマ相互作用について議論する。集団的レーザー生成プラズマ相互作用における効率の良いイオン加速は、慣性核融合研究や中性子スパレーションソースと連携を取りながら、ニュートリノより一般的な高エネルギー物理研究を切り開くものと考えられる。さらに、パラメトリック増幅による高強度レーザー技術は、慣性核融合炉用レーザーの現状の設計を大きく変えることなく応用できる。実験的な検証のために、効率の良いイオン加速領域の条件について議論する。

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