Spectral Modification of Shock Accelerated Ions Using a Hydrodynamically Shaped Gas Target

Tresca, O.; Dover, N. P.; Cook, Nathan; Maharjan, C.; Polyanskiy, Mikhail; Najmudin, Z.; Shkolnikov, P. L.; Pogorelsky, Igor

doi:10.1103/physrevlett.115.094802

Cited by 46 publications

(55 citation statements)

References 29 publications

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“…Furthermore, recent achievement of mono-energetic proton acceleration by collisionless ES shock produced by ultrahigh-intensity laser system [84][85][86] shows a possibility to apply the collisionless shock to several applications including medical treatment.…”

Section: Discussionmentioning

confidence: 99%

“…Numerical simulation has revealed ion acceleration at a relativistic ES shock generated in an overdense plasma due to reflection of ions in the upstream region by the shock front [75][76][77][78][79][80][81][82][83], and mono-energetic proton acceleration by ES shock has been shown experimentally [84][85][86]. These mono-energetic protons have a potential to be used in several applications including medical treatment [87].…”

Section: Introductionmentioning

confidence: 99%

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Collisionless electrostatic shock generation using high-energy laser systems

Sakawa

Morita

Kuramitsu

et al. 2016

Advances in Physics: X

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Collisionless shock is ubiquitous in space and astrophysical plasmas, and is believed to be a source of cosmic rays. In this review article, historical achievements of three different types of collisionless shocks, i.e. magnetohydrodynamic, electromagnetic, and electrostatic (ES) shocks, in theory/simulation, observation in space and astrophysical plasmas, and laboratory experiments are shown. An overview is given on recent progress of collisionless ES shock experiments using high-energy laser systems for two schemes. One is an interaction between laser-produced highdensity ablating plasma and a low-density ambient plasma, and the other is an interaction between laser-ablated counterstreaming plasmas using double-plane target. For the former scheme, detailed measurements of structures of collisionless ES shock and ion-acoustic soliton, and the transition from double-layer to collisionless ES shock are conducted by proton radiography. For the latter scheme, optical diagnostics are used to observe global structures of plasmas and shocks; collective laser Thomson scattering method is applied to clarify local plasma parameters, such as electron and ion temperatures, flow velocity, and electron density; and proton radiography is employed to measure a shock electric field. The measured large density-jump, steepening of self-emission profile, plasma parameters in the upand down-stream regions of a shock, and the narrow width of the shock electric field compared with the ion-ion Coulomb meanfree-path reveal the evidence for the formation of collisionless ES shock. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Collisionless electrostatic shock generation using high-energy laser systems

Sakawa

Morita

Kuramitsu

et al. 2016

Advances in Physics: X

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“…Recent theoretical work has highlighted the promise of employing shaped density profile for enhancing this acceleration process [27]. Work also reported by N. Dover (IC) described how tailoring the profile of a gas jet, by using laser-driven blast waves, can be used to control the energy and spectral profile of the shock-accelerated accelerated ions [28] . This experiment employed the CO2 laser system at the Accelerator Test Facility at BNL.…”

Section: Collisionless Shock Accelerationmentioning

confidence: 99%

Summary of Working Group 2: Ion beams from plasmas

Borghesi

Schramm

2016

Nuclear Instruments and Methods in Physics Research Section A:

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“…Recently, Tresca et al found that monoenergetic ions are produced when there is a low-energy prepulse 25 ns before the main pulse from BNL's CO 2 laser system. 8 The prepulse ionizes and heats the gas near the focus, and then the expanding blast wave forms a hollow "bubble" surrounded by a sharp, high-density wall before the main pulse arrives. Monoenergetic ions are observed at an optimal prepulse energy.…”

Section: Introductionmentioning

confidence: 99%

Observation of monoenergetic protons from a near-critical gas target tailored by a hydrodynamic shock

et al. 2015

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We present our recent experimental results of monoenergetic protons accelerated from the interaction of an intense terawatt CO 2 laser pulse with a near-critical hydrogen gas target, with its density profile tailored by a hydrodynamic shock. A 5-ns Nd:YAG laser pulse is focused onto a piece of stainless steel foil mounted at the front edge of the gas jet nozzle orifice. The ablation launches a spherical shock into the near-critical gas column, which creates a sharp density gradient at the front edge of the target, with ~ 6X local density enhancement up to several times of critical density within ~<100 microns. With such density profile, we have obtained monoenergetic proton beams with good shot-to-shot reproducibility and energies up to 1.2 MeV.

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Spectral Modification of Shock Accelerated Ions Using a Hydrodynamically Shaped Gas Target

Cited by 46 publications

References 29 publications

Collisionless electrostatic shock generation using high-energy laser systems

Collisionless electrostatic shock generation using high-energy laser systems

Summary of Working Group 2: Ion beams from plasmas

Observation of monoenergetic protons from a near-critical gas target tailored by a hydrodynamic shock

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