Beatwave excitation of plasma wave and electron acceleration

Kitagawa, Y.; Sawai, K.; Mima, K.; Nishihara, K.; Azechi, H.; Tanaka, K. A.; Takabe, H.; Nakai, S.

doi:10.1063/1.40761

Cited by 24 publications

(42 citation statements)

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“…The minimum trapping energy W min was found to be 1.5 MeV. 2 This energy is higher than that expected from the laser ponderomotive force, 25 which is T hot ¼ ð ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi ð1 þ a 2 0 Þ p À 1Þm e c 2 ¼ 36 keV. Therefore, to accelerate electrons using forced-plasma-wave excitation, both higher-density and higher-energy electrons should be injected into the wake field.…”

Section: Discussionmentioning

confidence: 99%

“…The concept of a laser-plasma accelerator 1 has been demonstrated for ns-pulse double-line CO 2 lasers for selftrapping electrons in a plasma 2 and for the external injection of electrons from a radio-frequency linear accelerator. 3 In addition, a ps-pulse CO 2 laser beat wave has been used to accelerate injected electrons into a 3-cm-long plasma wave.…”

Section: Introductionmentioning

confidence: 99%

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Acceleration of cone-produced electrons by double-line Ti-sapphire laser beating

Mori

Kitagawa

2012

Physics of Plasmas

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Acceleration of electrons is demonstrated in a beat wave scheme by using a prepulse-free short-pulse (150 fs) double-line Ti-sapphire laser. To inject electrons, we used a hybrid target composed of a cone-drilled plate and a gas jet, where the cone-produced electrons were accelerated via the forced plasma wave excited in the gas jet that was situated behind the plate. This resulted in an increase in slope temperature from 0.05 to 0.15 MeV. We find a correlation between the slope temperature and forced relativistic plasma wave. The wake amplitude is 15 GV/m at the resonant density of 2:5 Â 10 18 cm À3 in a hydrogen plasma. The wake acceleration models can explain the increase in slope temperature.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acceleration of cone-produced electrons by double-line Ti-sapphire laser beating

Mori

Kitagawa

2012

Physics of Plasmas

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“…At that time, the laser pulse duration is of the order of 300 ps at full width at half maximum (FWHM). Experiments in this regime were also carried out for instance at UCLA [3] (energy gain of 30 MeV), at Ecole Polytechnique [4] and at Osaka [5].…”

Section: Laser Beatwave Accelerationmentioning

confidence: 99%

Production and applications of quasi-monoenergetic electron bunches in laser-plasma based accelerators

Glinec¹,

Faure²,

Ewald³

et al. 2006

AIP Conference Proceedings

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Plasmas are attractive media for the next generation of compact particle accelerators because they can sustain electric fields larger than those in conventional accelerators by three orders of magnitude. However, until now, plasma-based accelerators have produced relatively poor quality electron beams even though for most practical applications, high quality beams are required. In particular, beams from laser plasma-based accelerators tend to have a large divergence and very large energy spreads, meaning that different particles travel at different speeds. The combination of these two problems makes it difficult to utilize these beams. Here, we demonstrate the production of high quality and high energy electron beams from laser-plasma interaction: in a distance of 3 mm, a very collimated and quasi-monoenergetic electron beam is emitted with a 0.5 nanocoulomb charge at 170 ± 20 MeV. In this regime, we have observed very nonlinear phenomena, such as self-focusing and temporal self-shortenning down to 10 fs durations. Both phenomena increase the excitation of the wakefield. The laser pulse drives a highly nonlinear wakefield, able to trap and accelerate plasma background electrons to a single energy. We will review the different regimes of electron acceleration and we will show how enhanced performances can be reached with state-ofthe-art ultrashort laser systems. Applications such as gamma radiography of such electron beams will also be discussed.

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“…The potential at any particular altitude changes temporally, and many studies of this phenomenon are available [1]. Initially, observations focused on the atmospheric potential; later the focus shifted to the electrical field and to the electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Measurement of small variations of atmospheric electrical field signals in fair weather

Narita¹,

Takeuchi

Chubachi

et al. 1999

Elect. Eng. Jpn.

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The variations in atmospheric electrical field signals in fair weather were observed both at Aobayama in Sendai and at Tsukidate in the Miyagi Prefecture. The measurements were made using a slow antenna type electrical field meter composed of a metal plate electrode and a CR integrator. They were recorded using a portable pen‐recorder. A field meter of this type is suitable for measuring relatively rapid variations. The observations were made in a period of a few minutes in fair breezy weather. The data collected using a bare metal electrode were compared with those using an insulated electrode in order to detect an air‐earth current. Examination of the dependence of the amplitude of the variation to the electrode size and height showed that the atmospheric electrical field is affected by these parameters. Observation of signals at two different positions gave the time delay between positions. This indicated that the electrical field perturbation was about several hundred meters. The well known atmospheric circulation with a period of a few minutes suggests that the observed variations in the electrical field signals were caused by electrical charges moving together with the atmospheric circulation. © 1998 Scripta Technica, Electr Eng Jpn, 125(4): 34–42, 1998

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Beatwave excitation of plasma wave and electron acceleration

Cited by 24 publications

References 0 publications

Acceleration of cone-produced electrons by double-line Ti-sapphire laser beating

Acceleration of cone-produced electrons by double-line Ti-sapphire laser beating

Production and applications of quasi-monoenergetic electron bunches in laser-plasma based accelerators

Measurement of small variations of atmospheric electrical field signals in fair weather

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