Optical guidance of terrawatt laser pulses by the implosion phase of a fast Z-pinch discharge in a gas-filled capillary

Hosokai, Tomonao; Kando, M.; Dewa, H.; Kotaki, Hajime; Kondo, Syuji; Hasegawa, Noboru; Nakajima, Kazuhisa; Horioka, Kazuhiko

doi:10.1364/ol.25.000010

Cited by 142 publications

(83 citation statements)

References 11 publications

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“…Plasma waveguides for guiding ultraintense short laser pulses in plasmas are produced by a number of methods, including laser-induced hydrodynamic expansion [45−47] , pulsed discharges of an ablative capillary [4,5,48,49] or a gas-filled capillary [50,51] . However, the length of such a plasma channel has been limited to less than 10 cm and the plasma density has been created for n 0 10 17 cm −3 .…”

Section: Discussionmentioning

confidence: 99%

100-GeV large scale laser plasma electron acceleration by a multi-PW laser

Nakajima¹,

Lu²,

Zhao³

et al. 2013

中国光学快报

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We present three possible design options of laser plasma acceleration (LPA) for reaching a 100-GeV level energy by means of a multi-petawatt laser such as the 3.5-kJ, 500-fs PETawatt Aquitane Laser (PETAL) at French Alternative Energies and Atomic Energy Commission (CEA). Based on scaling of laser wakefield acceleration in the quasi-linear regime with the normalized vector potential a0 = 1.4(1.6), acceleration to 100 (130) GeV requires a 30-m-long plasma waveguide operated at the plasma density ne ≈ 7 × 10 15 cm −3 with a channel depth Δn/ne = 20%, while a nonlinear laser wakefield accelerator in the bubble regime with a0 2 can reach 100 GeV approximately in a 36/a0-m-long plasma through self-guiding. The third option is a hybrid concept that employs a ponderomotive channel created by a long leading pulse for guiding a short trailing driving laser pulse. The detail parameters for three options are evaluated, optimizing the operating plasma density at which a given energy gain is obtained over the dephasing length and the matched conditions for propagation of relativistic laser pulses in plasma channels, including the self-guiding. For the production of high-quality beams with 1%-level energy spread and a 1π-mm-mradlevel transverse normalized emittance at 100-MeV energy, a simple scheme based on the ionization-induced injection mechanism may be conceived. We investigate electron beam dynamics and effects of synchrotron radiation due to betatron motion by solving the beam dynamics equations on energy and beam radius numerically. For the bubble regime case with a0 = 4, radiative energy loss becomes 10% at the maximum energy of 90 GeV.

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Section: Discussionmentioning

confidence: 99%

100-GeV large scale laser plasma electron acceleration by a multi-PW laser

Nakajima¹,

Lu²,

Zhao³

et al. 2013

中国光学快报

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“…As discussed, the lower plasma densities for a centimeter scale laser-driven hydrodynamic expansion waveguide made that approach unpractical because low efficiency heating needs high energy heater. The Ignitor -heater concept [114,115,123] was not the only way to achieve a guiding of an intense laser, and however, other guiding concepts relying on the use of preformed plasma channels have been pursued by several groups around the world [124][125][126][127][128]. An alternative plasma channel technology, based on capillary discharge guides (CDG), was developed at Oxford University [129][130][131].…”

Section: Loasis Laser Plasma Based Acceleratorsmentioning

confidence: 99%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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“…1 Although sufficiently intense pulses can selfguide by relativistic self-focusing, 2-4 preformed plasma channels [5][6][7] offer superior control over the mode quality of the guided pulse. 8 Milchberg and co-workers [6][7][8] have developed a method for producing 2 cm long, 10-50 m radius channels of excellent optical quality by ionizing and heating heavy noble gases or N 2 with axicon-focused 0.3 J, 100 ps Nd:Y 3 Al 5 O 12 ͑Nd:YAG͒ laser pulses to induce a radially expanding shock.…”

Section: ͓S0003-6951͑00͒04648-9͔mentioning

confidence: 99%