Acceleration of collimated 45 MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 1020W/cm2, 1 μm laser

被引：18

作者：

Antici, P. ^{[1
]}

Boella, E. ^{[5
]}

Chen, S. N. ^{[2
,8
]}

Andrews, D. S. ^{[9
]}

Barberio, M. ^{[1
]}

Boeker, J. ^{[6
]}

Cardelli, F. ^{[1
,3
,4
]}

Feugeas, J. L. ^{[7
]}

Glesser, M. ^{[1
,2
]}

Nicolai, P. ^{[7
]}

Romagnani, L. ^{[2
]}

Sciscio, M. ^{[1
,3
,4
]}

Starodubtsev, M. ^{[8
]}

Willi, O. ^{[6
]}

Kieffer, J. C. ^{[1
]}

Tikhonchuk, V. ^{[7
]}

Pepin, H. ^{[1
]}

Silva, L. O. ^{[5
]}

d' Humieres, E. ^{[7
]}

Fuchs, J. ^{[2
,8
]}

机构：

[1] INRS EMT, 1650 Blvd Lionel Boulet, Varennes, PQ J3X 1S2, Canada

[2] UPMC Univ Paris 06, Sorbonne Univ, Univ Paris Saclay, LULI CNRS,Ecole Polytech,CEA, F-91128 Palaiseau, France

[3] Univ Roma La Sapienza, INFN, I-00185 Rome, Italy

[4] Univ Roma Sapienza, Dipartimento SBAI, I-00185 Rome, Italy

[5] Univ Lisbon, GoLP Inst Plasmas & Fusao Nucl, Inst Super Tecn, P-1049001 Lisbon, Portugal

[6] Heinrich Heine Univ, Inst Laser & Plasmaphys, Dusseldorf, Germany

[7] Univ Bordeaux, CELIA, Talence, France

[8] Inst Appl Phys, 46 Ulyanov St, Nizhnii Novgorod 603950, Russia

[9] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

欧洲研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

HIGH-INTENSITY; CODE;

D O I：

10.1038/s41598-017-15449-8

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A new type of proton acceleration stemming from large-scale gradients, low-density targets, irradiated by an intense near-infrared laser is observed. The produced protons are characterized by high-energies (with a broad spectrum), are emitted in a very directional manner, and the process is associated to relaxed laser (no need for high-contrast) and target (no need for ultra-thin or expensive targets) constraints. As such, this process appears quite effective compared to the standard and commonly used Target Normal Sheath Acceleration technique (TNSA), or more exploratory mechanisms like Radiation Pressure Acceleration (RPA). The data are underpinned by 3D numerical simulations which suggest that in these conditions a Low Density Collisionless Shock Acceleration (LDCSA) mechanism is at play, which combines an initial Collisionless Shock Acceleration (CSA) to a boost procured by a TNSA-like sheath field in the downward density ramp of the target, leading to an overall broad spectrum. Experiments performed at a laser intensity of 10(20) W/cm(2) show that LDCSA can accelerate, from similar to 1% critical density, mm-scale targets, up to 5 x 10(9) protons/MeV/sr/J with energies up to 45(+/- 5) MeV in a collimated (similar to 6 degrees half-angle) manner.

引用

页数：9

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