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論文

Beam collimation and transport of quasineutral laser-accelerated protons by a solenoid field

Harres, K.*; Alber, I.*; Tauschwitz, A.*; Bagnoud, V.*; 大道 博行; G$"u$nther, M.*; N$"u$rnberg, F.*; Otten, A.*; Schollmeier, M.*; Sch$"u$trumpf, J.*; et al.

Physics of Plasmas, 17(2), p.023107_1 - 023107_7, 2010/02

 被引用回数:50 パーセンタイル:87.14(Physics, Fluids & Plasmas)

This article reports about controlling laser-accelerated proton beams with respect to beam divergence and energy. The particles are captured by a pulsed high field solenoid with a magnetic field strength of 8.6 T directly behind a flat target foil that is irradiated by a high intensity laser pulse. Proton beams with energies around 2.3 MeV and particle numbers of 10$$^{12}$$ could be collimated and transported over a distance of more than 300 mm. In contrast to the protons the comoving electrons are strongly deflected by the solenoid field. They propagate at a submillimeter gyroradius around the solenoid's axis which could be experimentally verified. The originated high flux electron beam produces a high space charge resulting in a stronger focusing of the proton beam than expected by tracking results. Leadoff particle-in-cell simulations show qualitatively that this effect is caused by space charge attraction due to the comoving electrons. The collimation and transport of laser-accelerated protons is the first step to provide these unique beams for further applications such as postacceleration by conventional accelerator structures.

論文

Proton acceleration experiments and warm dense matter research using high power lasers

Roth, M.*; Alber, I.*; Bagnoud, V.*; Brown, C. R. D.*; Clarke, R.*; 大道 博行; Fernandez, J.*; Flippo, K.*; Gaillard, S.*; Gauthier, C.*; et al.

Plasma Physics and Controlled Fusion, 51(12), p.124039_1 - 124039_7, 2009/12

 被引用回数:27 パーセンタイル:72.19(Physics, Fluids & Plasmas)

The acceleration of intense proton and ion beams by ultra-intense lasers has matured to a point where applications in basic research and technology are being developed. Crucial for harvesting the unmatched beam parameters driven by the relativistic electron sheath is the precise control of the beam. In this paper we report on recent experiments using the PHELIX laser at GSI, the VULCAN laser at RAL and the TRIDENT laser at LANL to control and use laser accelerated proton beams for applications in high energy density research. We demonstrate efficient collimation of the proton beam using high field pulsed solenoid magnets, a prerequisite to capture and transport the beam for applications. Furthermore, we report on two campaigns to use intense, short proton bunches to isochorically heat solid targets up to the warm dense matter state. The temporal profile of the proton beam allows for rapid heating of the target, much faster than the hydrodynamic response time thereby creating a strongly coupled plasma at solid density. The target parameters are then probed by X-ray Thomson scattering to reveal the density and temperature of the heated volume. This combination of two powerful techniques developed during the past few years allows for the generation and investigation of macroscopic samples of matter in states present in giant planets or the interior of the earth.

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