Diagnostics of an electron beam of a linear accelerator using coherent transition radiation

Shibata, Yukio; Takahashi, Toshiharu; Kanai, T.; Ishi, K.; Ikezawa, Mikihiko; Ohkuma, J.; Okuda, Shuichi; Okada, T.

doi:10.1103/physreve.50.1479

Cited by 113 publications

(73 citation statements)

References 13 publications

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“…The gas jet was backed with up to 70 bar helium gas. The profile of the jet had a 1.8 mm flat top at a density of about 3ϫ10 19 cm Ϫ3 with a ramp of 1 mm length to zero density on either side ͑a total length of just under 4 mm͒. The plasma density profile, measured with a folded-wave interferometer using 400 nm wavelength, 50 fs duration laser pulses, had a typical transverse size of 100 mϮ15 m. The lay-out of the experiment in shown in Fig.…”

Section: A Setupmentioning

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: A Setupmentioning

confidence: 99%

“…The energy radiated, per unit frequency d and per unit solid angle d⍀, from a single electron traversing the dielectric boundary is given by the well-known result [17][18][19] …”

Section: A Ideal Monoenergetic Bunchmentioning

confidence: 99%

Terahertz radiation from laser accelerated electron bunches

et al. 2004

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“…However, using DR one can develop an almost noninvasive diagnostics method. In the experiment [2] the transverse beam size was measured using optical DR (ODR) with an accuracy of the order of 14 m. It is also possible to measure a longitudinal beam profile through the analysis of coherent TR or DR spectral characteristics [3]. Recently, we proposed to use focused coherent DR for soft x-ray generation via the inverse Thompson scattering process [4].…”

Section: Introductionmentioning

confidence: 99%

Observation of focusing effect in optical transition and diffraction radiation generated from a spherical target

Сухих

Aryshev

Karataev

et al. 2009

Phys. Rev. ST Accel. Beams

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For the first time the focusing effect in optical transition and diffraction radiation generated by 1.28 GeV electrons in a tilted spherical target has been observed experimentally. A comparison of detected as well as simulated radiation spatial distributions produced by a flat and a spherical target has been made. It is shown that the application of such targets has allowed us to increase the radiation spectralspatial density at the target focus without applying any additional focusing devices.

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“…[22][23][24][25][26] Another technique relies on the spectral characterization of coherent radiation ͑typically through interferometry͒, emitted by an electron bunch after it propagates through a discontinuity in a dielectric environment. The discontinuity can be realized through insertion of a metallic foil in the bunch path, [27][28][29] resulting in the emission of coherent transition radiation ͑CTR͒. 30 To implement a diagnostic for LWFAproduced bunches, we rely on the emission of CTR ͑pre-dominantly at THz frequencies͒, emitted as the electron bunch exits the plasma-vacuum interface.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Radiation as a Bunch Diagnostic for Laser-Wakefield-Accelerated Electron Bunches

Tilborg

Schroeder

Tóth

et al. 2006

AIP Conference Proceedings

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Experimental results are reported from two measurement techniques ͑semiconductor switching and electro-optic sampling͒ that allow temporal characterization of electron bunches produced by a laser-driven plasma-based accelerator. As femtosecond electron bunches exit the plasma-vacuum interface, coherent transition radiation ͑at THz frequencies͒ is emitted. Measuring the properties of this radiation allows characterization of the electron bunches. Theoretical work on the emission mechanism is presented, including a model that calculates the THz wave form from a given bunch profile. It is found that the spectrum of the THz pulse is coherent up to the 200 m thick crystal ͑ZnTe͒ detection limit of 4 THz, which corresponds to the production of sub-50 fs ͑rms͒ electron bunch structure. The measurements demonstrate both the shot-to-shot stability of bunch parameters that are critical to THz emission ͑such as total charge and bunch length͒, as well as femtosecond synchronization among bunch, THz pulse, and laser beam.

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Diagnostics of an electron beam of a linear accelerator using coherent transition radiation

Cited by 113 publications

References 13 publications

Terahertz radiation from laser accelerated electron bunches

Terahertz radiation from laser accelerated electron bunches

Observation of focusing effect in optical transition and diffraction radiation generated from a spherical target

Terahertz Radiation as a Bunch Diagnostic for Laser-Wakefield-Accelerated Electron Bunches

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