Observation of soft x-ray transition radiation from medium energy electrons

Chu, A. N.; Piestrup, M. A.; Barbee, Troy W.; Pantell, R. H.; Buskirk, F.R.

doi:10.1063/1.1136260

Cited by 21 publications

(6 citation statements)

References 8 publications

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“…The effect of the transverse electron coordinates ρ 0j = (x 0j , y 0j ) (j = 1, .., N) on the Fourier transformation of the charge electric field is driven by a phase factor, see Eqs. (16,17) and Eqs. (18,19).…”

Section: Covariance Of the Electron Bunch Form Factormentioning

confidence: 99%

“…With reference to Eqs. (16,17) and Eqs. (18,19), the charge electric field shows a dependence on the transverse electron coordinates which, under a Lorentz transformation from the laboratory to the rest reference frame, transfers and transforms in a covariant way and whose observability at a given wavelength remains unchanged, this being determined by the Lorentz-invariant scalar product of the electron transverse coordinates and the transverse components of the wave-vector.…”

Section: Covariance Of the Electron Bunch Form Factormentioning

confidence: 99%

“…where, in the equation above, the 3 components of the electric field of the N electron bunch in the laboratory reference frame R can be recognized, see Eqs. (16,17) and also Appendix D:…”

Section: Appendix a Lorentz Transformations Of Coordinates And Fieldsmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Covariance Of the Electron Bunch Form Factormentioning

confidence: 99%

Section: Covariance Of the Electron Bunch Form Factormentioning

confidence: 99%

“…where, in the equation above, the 3 components of the electric field of the N electron bunch in the laboratory reference frame R can be recognized, see Eqs. (16,17) and also Appendix D:…”

Section: Appendix a Lorentz Transformations Of Coordinates And Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…2. There is a significantly intensive soft X-ray transition radiation (XTR) 7 , but we are not planning to use it. A dipole magnet will be placed beyond the mirror to deflect the residual electrons toward the beam dump.…”

Section: Introductionmentioning

confidence: 99%

THz-pump and X-ray-probe sources based on an electron linac

Setiniyaz

Park

Kim

et al. 2017

Review of Scientific Instruments

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We describe a compact THz-pump and X-ray-probe beamline, based on an electron linac, for ultrafast time-resolved diffraction applications. Two high-energy electron (γ > 50) bunches, 5 ns apart, impinge upon a single-foil or multifoil radiator and generate THz radiation and X-rays simultaneously. The THz pulse from the first bunch is synchronized to the X-ray beam of the second bunch by using an adjustable optical delay of a THz pulse. The peak power of THz radiation from the multifoil radiator is estimated to be 0.14 GW for a 200 pC well-optimized electron bunch. GEANT4 simulations show that a carbon foil with a thickness of 0.5-1.0 mm has the highest yield of 10-20 keV hard X-rays for a 25 MeV beam, which is approximately 10 photons/(keV pC-electrons) within a few degrees of the polar angle. A carbon multifoil radiator with 35 foils (25 μm thick each) can generate close to 10 hard X-rays/(keV pC-electrons) within a 2° acceptance angle. With 200 pC charge and a 100 Hz repetition rate, we can generate 10 X-rays per 1 keV energy bin per second or 10 X-rays per 1 keV energy bin per pulse. The longitudinal time profile of an X-ray pulse ranges from 400 to 600 fs depending on the acceptance angle. The broadening of the time duration of an X-ray pulse is observed owing to its diverging effect. A double-crystal monochromator will be used to select and transport the desired X-rays to the sample. The heating of the radiators by an electron beam is negligible because of the low beam current.

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Radiation Sources for X-Ray Microscopy

Michette

1990

Modern Microscopies

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Observation of soft x-ray transition radiation from medium energy electrons

Cited by 21 publications

References 8 publications

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

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

THz-pump and X-ray-probe sources based on an electron linac

Radiation Sources for X-Ray Microscopy

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