Absolute scale power measurements of frequency-locked coherent transition radiation

Marsh, Roark; Kesar, Amit S.; Temkin, Richard J.

doi:10.1103/physrevstab.10.082801

Cited by 5 publications

(5 citation statements)

References 18 publications

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“…There are several approaches based on electron beam technologies (see, for instance, [9][10][11][12]) proposed to design such a source. In most cases an adjustable monochromator needs to be foreseen to achieve a narrow-band THz output, but tunable in a broad spectral range.…”

Section: Introductionmentioning

confidence: 99%

Monochromaticity of coherent Smith-Purcell radiation from finite size grating

Aryshev

Потылицын

Naumenko

et al. 2017

Phys. Rev. Accel. Beams

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Investigation of coherent Smith-Purcell Radiation (SPR) spectral characteristics was performed both experimentally and by numerical simulation. The measurement of SPR spectral line shapes of different diffraction orders was carried out at KEK LUCX facility. A pair of room-temperature Schottky barrier diode (SBD) detectors with sensitivity bands of 60 − 90 GHz and 320 − 460 GHz was used in the measurements. Reasonable agreement of experimental results and simulations performed with CST Studio Suite justifies the use of different narrow-band SBD detectors to investigate different SPR diffraction orders. It was shown that monochromaticity of the SPR spectral lines increases with diffraction order. The comparison of coherent transition radiation and coherent SPR intensities in sub-THz frequency range showed that the brightnesses of both radiation mechanisms were comparable. A fine tuning feasibility of the SPR spectral lines is discussed.

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Section: Introductionmentioning

confidence: 99%

Monochromaticity of coherent Smith-Purcell radiation from finite size grating

Aryshev

Потылицын

Naumenko

et al. 2017

Phys. Rev. Accel. Beams

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“…Thanks to the relativistic origin, transition radiation can be fruitfully exploited for energy detection or mass identification of high energy particles [9,10,11,12,13,14,15,16,17,18,19,20]. Transition radiation based diagnostics is commonly used in a particle accelerator to monitor the transverse [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37] or the longitudinal profile of a charged beam [38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55]. Transition radiators, typically made of a thin metallic foil or a thin polished Aluminium coating on dielectric substrates, respond as an ideal conductor over a ...…”

Section: Introductionmentioning

confidence: 99%

Covariant formulation of the transition radiation energy spectrum of an electron beam at a normal angle of incidence onto a round metallic screen

Orlandi

2013

Optics Communications

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In the transition radiation emission from a N electron bunch hitting at a normal angle of incidence a metallic screen, the transverse and the longitudinal spatial coordinates of the electron bunch play different roles in determining the N single electron radiation field amplitudes and their relative phases in relation to the different physical constraints which an electromagnetic radiative mechanism by a charged beam must meet: i.e., temporal causality and covariance. The distribution of the N electron longitudinal coordinates determines indeed the sequence of the N electron collisions onto the metallic screen and, on the basis of the temporal causality principle, it also determines the distribution function of the relative emission phases of the N single electron field amplitudes from the metallic surface. The distribution of the transverse coordinates of the N electrons contributes as well to determine the relative phase distribution of the N electron field amplitudes at the observation point -located on the longitudinal axis of the reference frameproviding a further phase information that accounts for the transverse displacement of the N electrons with respect to the beam axis. The distribution of the transverse coordinates of the N electrons is a relativistic invariant under a Lorentz transformation with respect to the direction of motion of the beam and, consequently, it is expected to leave a covariant mark on the N single electron amplitudes composing the radiation field. The covariant imprinting of the N electron transverse density on the radiation field affects both the temporal coherent and incoherent parts of the transition radiation Email address: gianluca.orlandi@psi.ch (Gian Luca Orlandi) PSI Preprint: PSI-PR-12-02May 22, 2018 energy spectrum. Such a dependence of the N single electron radiation field amplitudes on the electron density in the transverse plane manifests itself as an increase -towards an asymptotic limit -of the radiated spectral energy with the decrease of the beam transverse size and as a spectral narrowing of the angular distribution of the radiation intensity with respect to the ideal case of a single electron hitting an infinite metallic screen. In the case of a round metallic screen with an arbitrary radius, the formal expression of the transition radiation energy spectrum will be derived and numerical results will be presented.

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“…Another application of the CTR process (as well as the coherent diffraction radiation (CDR)) is the measurement of longitudinal profile of ultra short bunches. As a rule one has to measure the CTR / CDR spectrum in order to reconstruct the bunch profile using, for instance, inverse Fourier transform [7]. To determine the bunch length it is necessary to measure the high-frequency range of the CTR spectrum with high accuracy.…”

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confidence: 99%

“…The CTR process generated by an electron beam consisting of a periodic train of bunches was also studied in [3,7,8]. In [9][10][11] the authors investigated this effect for the coherent synchrotron radiation mechanism, in [12] -for the coherent Smith-Purcell radiation.…”

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confidence: 99%

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Monochromatic coherent transition and diffraction radiation from a relativistic electron bunch train

et al. 2018

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Electron beams of most accelerators have a bunched structure and are synchronized with the accelerating RF field. Due to modulation of the electron beam with frequency ν RF one can expect to observe resonances with frequencies ν k=k⋅ ν RF in radiation spectrum generated via any spontaneous emission mechanism (k is an integer and the resonance order). In this paper we present the results of spectral measurements of coherent transition radiation (CTR) generated by an electron bunch train from the Tomsk microtron with ν RF=2.63GHz in the spectral frequency range from 8 to 35 GHz. We also measured the spectrum of coherent diffraction radiation and demonstrated that the observed spectra in both cases consist of monochromatic lines. For spectral measurements the Martin-Puplett interferometer with spectral resolution of 800 MHz (FWMH) was employed. Using a waveguide frequency cut-off we were able to exclude several spectral lines to observe higher resonance orders of up to k =7.

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Absolute scale power measurements of frequency-locked coherent transition radiation

Cited by 5 publications

References 18 publications

Monochromaticity of coherent Smith-Purcell radiation from finite size grating

Monochromaticity of coherent Smith-Purcell radiation from finite size grating

Covariant formulation of the transition radiation energy spectrum of an electron beam at a normal angle of incidence onto a round metallic screen

Monochromatic coherent transition and diffraction radiation from a relativistic electron bunch train

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