Electron Beam Characteristics from Laser-Driven Wave Breaking

Tzeng, K. C.; Mori, W. B.; Katsouleas, T.

doi:10.1103/physrevlett.79.5258

Cited by 69 publications

(48 citation statements)

References 23 publications

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“…7 contains 22% of the radiation emitted in the frequency range 0.3-2.9 THz, and 78% of the radiation emitted within the frequency range 2.9-19 THz range. An rms bunch length on the order of 10 m is consistent with self-modulated LWFA simulations 28 which typically predict electron beam bunch lengths to be on the order of the laser pulse duration. …”

Section: E Radiation Spectrumsupporting

confidence: 51%

“…The bunch length would therefore be on the order of the laser pulse length, consistent with particle-in-cell code results. 28 In the present experiment, 3-5 nJ-level pulses were collected within a limited 30 mrad collection angle, 12 and 70-80 nJ when collecting radiation in the angular range 80-300 mrad. For the latter case the charge per bunch was 0.3 nC.…”

Section: Discussionmentioning

confidence: 99%

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Terahertz radiation from laser accelerated electron bunches

et al. 2004

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Coherent terahertz and millimeter wave radiation from laser accelerated electron bunches has been measured. The bunches were produced by tightly focusing (spot diameter ≈6 μm) a high peak power (up to 10 TW), ultra-short (⩾50 fs) laser pulse from a high repetition rate (10 Hz) laser system (0.8 μm), onto a high density (>1019 cm−3) pulsed gas jet of length ≈1.5 mm. As the electrons exit the plasma, coherent transition radiation is generated at the plasma-vacuum boundary for wavelengths long compared to the bunch length. Radiation in the 0.3–19 THz range and at 94 GHz has been measured and found to depend quadratically on the bunch charge. The measured radiated energy for two different collection angles is in good agreement with theory. Modeling indicates that optimization of this table-top source could provide more than 100 μJ/pulse. Together with intrinsic synchronization to the laser pulse, this will enable numerous applications requiring intense terahertz radiation. This radiation can also be used as a powerful tool for measuring the properties of laser accelerated bunches at the exit of the plasma accelerator. Preliminary spectral measurements indicates that bunches as short as 30–50 fs have been produced in these laser driven accelerators.

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Section: E Radiation Spectrumsupporting

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Terahertz radiation from laser accelerated electron bunches

et al. 2004

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“…An rms bunch length on the order of 10 µm, is consistent with self-modulated LWFA simulations [52], which typically predict electron beam bunch lengths to be on the order of the laser pulse duration or shorter.…”

Section: Bunch Duration Measurement Using Coherent Transition Radiationsupporting

confidence: 56%

Advances in Laser Driven Accelerator R&D

Leemans

2004

AIP Conference Proceedings

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Abstract. Current activities (last few years) at different laboratories, towards the development of a laser wakefield accelerator (LWFA) are reviewed, followed by a more in depth discussion of results obtained at the L'OASIS laboratory of LBNL. Recent results on laser guiding of relativistically intense beams in preformed plasma channels are discussed. The observation of mono-energetic beams in the 100 MeV energy range, produced by a channel guided LWFA at LBNL, is described and compared to results obtained in the unguided case at LOA, RAL and LBNL. Analysis, aided by particle-in-cell simulations, as well as experiments with various plasma lengths and densities, indicate that tailoring the length of the accelerator has a very beneficial impact on the electron energy distribution. Progress on laser triggered injection is reviewed. Results are presented on measurements of bunch duration and emittance of the accelerated electron beams, that indicate the possibility of generating femtosecond duration electron bunches. Future challenges and plans towards the development of a 1 GeV LWFA module are discussed.

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“…[3][4][5] Both have been observed in the damping of the EPW excited by Raman backscattering instability ͑which is a slow-phase-velocity wave͒, [6][7][8] and the latter have been observed in the collinear laser-beat-wave ͑which is a fast-phase-velocity wave͒. 9,10 The damping of a self-modulated laser wakefield was attributed to electron beam loading by Tzeng et al 11 in studies using a particle-in-cell simulation that assumes immobile ions. In this case, the EPW amplitude is not high enough to induce longitudinal ͑one-dimensional͒ wavebreaking.…”

Section: Introductionmentioning

confidence: 99%

Excitation and damping of a self-modulated laser wakefield

et al. 2000

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, "Excitation and damping of a self-modulated laser wakefield" (2000). Spatially, temporally, and angularly resolved collinear collective Thomson scattering was used to diagnose the excitation and damping of a relativistic-phase-velocity self-modulated laser wakefield. The excitation of the electron plasma wave was observed to be driven by Raman-type instabilities. The damping is believed to originate from both electron beam loading and modulational instability. The collective Thomson scattering of a probe pulse from the ion acoustic waves, resulting from modulational instability, allows us to measure the temporal evolution of the plasma temperature. The latter was found to be consistent with the damping of the electron plasma wave.

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Electron Beam Characteristics from Laser-Driven Wave Breaking

Cited by 69 publications

References 23 publications

Terahertz radiation from laser accelerated electron bunches

Terahertz radiation from laser accelerated electron bunches

Advances in Laser Driven Accelerator R&D

Excitation and damping of a self-modulated laser wakefield

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