Measurement of coherent Cherenkov radiation from an intense beam of a picosecond electron bunch

Ohkuma, J.; Okuda, Shuichi; Tsumori, K.

doi:10.1103/physrevlett.66.1967

Cited by 27 publications

(10 citation statements)

References 6 publications

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“…For the 23 Na parameters and statistically independent electrons, a photon is emitted in the mode under consideration each 10 7 electrons. This problem may be overcome by looking at the radiation generated by a very large number of electrons at a time [17]: since the radial velocity y r is much smaller than the charge velocity w, the profile of the group cone would not be smeared out even if the spatial extension of the bunch of electrons is much longer than the wavelength of the emitted light.…”

Section: -2 064801-2 Volume 87 Number 6 P H Y S I C a L R E V mentioning

confidence: 99%

Slow Group Velocity and Cherenkov Radiation

Carusotto

Artoni²,

Rocca

et al. 2001

Phys. Rev. Lett.

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We study theoretically the effect of ultraslow group velocities on the emission of Vavilov-Cherenkov radiation in a coherently driven medium. We show that in this case the aperture of the group cone on which the intensity of the radiation peaks is much smaller than that of the usual wave cone associated with the Cherenkov coherence condition. As a specific example, we consider a coherently driven ultracold atomic gas where such singular behavior may be observed.

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Section: -2 064801-2 Volume 87 Number 6 P H Y S I C a L R E V mentioning

confidence: 99%

Slow Group Velocity and Cherenkov Radiation

Carusotto

Artoni²,

Rocca

et al. 2001

Phys. Rev. Lett.

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“…The shock wave was transmitted and received by leaky transmission lines in a way which resembles Cherenkov radiation. Leaky transmission line antennas could be used in particle accelerator applications, such as for measuring the length of relativistic bunches by Cherenkov radiation [10], [11] in a similar manner to Smith-Purcell radiation [12], [13]. Underground anomaly detection by this method was presented.…”

Section: Discussionmentioning

confidence: 97%

Underground Anomaly Detection by Electromagnetic Shock Waves

Kesar

2011

IEEE Trans. Antennas Propagat.

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A method for the detection of underground anomalies by electromagnetic (EM) shock waves is presented. Following Grischkowsky et al. [Phys. Rev. Lett., vol. 59, pp. 1663-1666, 1987, an EM shock wave will develop in a dielectric medium by exciting a pulse which leaks into the dielectric bulk from a transmission line. A shock wave occurs when the group velocity in the line exceeds the phase velocity in the dielectric. This mechanism is similar to Cherenkov radiation. In this paper the transmission and reception of the EM shock wave between two identical leaky transmission lines is introduced. For underground detection, the two lines are placed in boreholes and are made in a manner in which the speed of propagation in the line is faster than the speed of propagation in the ground. The effect on the shock wave by an underground anomaly such as a dielectric or metallic pipeline located between the two boreholes is studied. The anomaly scatters the shock wave, resulting in a detectable disturbance in the received signal. The time delay of this disturbance, with respect to the time when the pulse was transmitted, is correlated with the location of the object. Numerical examples are presented by using a two-dimensional finite-difference time-domain algorithm.

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“…Similarly, using the backward emission of Cherenkov radiation in a metamaterial structure, high output powers were achieved by Hummelt [12] using a lower electron current (<100 A) and proved to be an interesting path toward compact high-power THz sources. Coherent Cherenkov radiation from short electron bunches was also observed experimentally in 1991 by Ciocci [13] and Ohkuma [14]. Its capability to produce high output powers at millimetre or sub-millimetre wavelengths has inspired several groups to develop dielectric wakefield acceleration (DWA) [15], where recent demonstrations have shown ultrahigh accelerating gradient (i.e., >GV=m) in capillary tubes [16].…”

Section: Introductionmentioning

confidence: 89%

Noninvasive bunch length measurements exploiting Cherenkov diffraction radiation

Curcio

Bergamaschi

Corsini

et al. 2020

Phys. Rev. Accel. Beams

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We present the observation and the detailed investigation of coherent Cherenkov diffraction radiation (CChDR) in terms of spectral-angular characteristics. Electromagnetic simulations have been performed to optimize the design of a prismatic dielectric radiator and the performance of a detection system with the aim of providing longitudinal beam diagnostics. Successful experimental validations have been organized on the CLEAR and the CLARA facilities based at CERN and Daresbury laboratory respectively. With ps to sub-ps long electron bunches, the emitted radiation spectra extend up to the THz frequency range. Bunch length measurements based on CChDR have been compared to longitudinal bunch profiles obtained using a radio frequency deflecting cavity or coherent transition radiation (CTR). The retrieval of the temporal profile of both Gaussian and non-Gaussian bunches has also been demonstrated. The proposed detection scheme paves the way to a new kind of beam instrumentation, simple and compact for monitoring short bunches of charged particles, particularly well-adapted to novel Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Measurement of coherent Cherenkov radiation from an intense beam of a picosecond electron bunch

Cited by 27 publications

References 6 publications

Slow Group Velocity and Cherenkov Radiation

Slow Group Velocity and Cherenkov Radiation

Underground Anomaly Detection by Electromagnetic Shock Waves

Noninvasive bunch length measurements exploiting Cherenkov diffraction radiation

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