Measurements of Smith–Purcell radiation

Shih, I-Fu; Salisbury, W. W.; Masters, D. L.; Chang, D. B.

doi:10.1364/josab.7.000345

Cited by 18 publications

(6 citation statements)

References 12 publications

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“…This is the term used to describe the radiation emitted through the interaction of a charged particle beam (electrons, in our case) with a nearby periodic metallic structure, the grating. The details of this process can be found in numerous publications [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and in the references contained therein, so we restrict ourselves to a brief summary of its essential features.…”

Section: Introductionmentioning

confidence: 99%

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

Blackmore

Doucas

Perry

et al. 2009

Phys. Rev. ST Accel. Beams

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Coherent Smith-Purcell (SP) radiation originating from three different gratings has been measured at End Station A, SLAC, and has been used to reconstruct the time profile of the electron bunches. The beam energy during these experiments was 28.5 GeV ( ffi 55 773) and the number of electrons in the bunch was 0:9-1:4 Â 10 10 . The spectral distribution of the radiated energy was measured by means of an array of 11 pyroelectric detectors. Typical values of the FWHM of the bunch length are about 2.5 ps, but sharper peaks with FWHM less than 2.0 ps have also been observed. The longitudinal profile also varies with accelerator conditions and can best be approximated by a superposition of 3-4 Gaussian curves. Some typical profiles are presented, together with a discussion of the limitations and strengths of coherent SP radiation as a diagnostic tool. It is concluded that SP radiation offers excellent prospects in this respect, not only in the picosecond range, but potentially in the femtosecond range as well.

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Section: Introductionmentioning

confidence: 99%

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

Blackmore

Doucas

Perry

et al. 2009

Phys. Rev. ST Accel. Beams

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show abstract

“…When electron wave packages travel near a metallic grating, SPR is generated and belongs to a thresholdless process, behaving like a simple Bragg scattering of the evanescent waves carried along with the electrons, where a constant light velocity fundamentally defines the angle relations of radiation's wavelength [14][15][16][17] . The speed of light directly determines the relative phase of scattering waves between two adjacent grating scatters.…”

Section: Introductionmentioning

confidence: 99%

Smith–Purcell radiation-like photoacoustic phased array

et al. 2023

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Relativistic electrons moving over a periodic metal grating can lead to an intriguing emission of light, known as Smith-Purcell radiation (SPR), the precursor of the free-electron laser. The speed of light plays a critical role in the far-field emission spectrum. Inspired by this photonic SPR, here we experimentally demonstrate a photoacoustic phased array using laser-induced shock waves. We observe acoustic radiation spectrum in the far field, perfectly predicted by a universal theory for the SPR. This scheme provides a tool to control the acoustic radiation in the near field, paving the way toward coherent acoustic wave generation and microstructure metrology.

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“…Since its first observation, SPR has been studied using mainly metallic diffraction gratings of one-dimensional periodicity [4,5,6,7,8]. In most theoretical analyses made so far, the gratings have been treated as perfect conductors to simplify the treatment of the periodic light scattering [9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Theory of unconventional Smith-Purcell radiation in finite-size photonic crystals

Ochiai¹,

Ohtaka²

2006

Opt. Express

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Unusual emission of light, called the unconventional SmithPurcell radiation (uSPR) in this paper, was demonstrated from an electron traveling near a finite photonic crystal (PhC) at an ultra-relativistic velocity. This phenomenon is not related to the accepted mechanism of the conventional SPR and arises because the evanescent light from the electron has such a small decay constant in the ultra-relativistic regime that it works practically as a plane-wave probe entering the PhC from one end. We analyze the dependence of the SPR spectrum on the velocity of electron and on the parity of excited photonic bands and show, for PhCs made up of a finite number of cylinders, that uSPR probes the photonic band structure very faithfully.

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Measurements of Smith–Purcell radiation

Cited by 18 publications

References 12 publications

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

First measurements of the longitudinal bunch profile of a 28.5 GeV beam using coherent Smith-Purcell radiation

Smith–Purcell radiation-like photoacoustic phased array

Theory of unconventional Smith-Purcell radiation in finite-size photonic crystals

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