Measurement of very short time ∼10−19–10−17 s structures with the help of X-ray transition radiation

Gazazian, E. D.; Ispirian, K.A.; Ispirian, R. K.; Ivanian, M. I.

doi:10.1016/s0168-583x(00)00193-2

Cited by 10 publications

(1 citation statement)

References 10 publications

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“…First, there is enough COTR energy to distribute to ⇠ 3⇥ as many filtered cameras as demonstrated here, enabling larger spectral range and density and correspondingly greater resolution. Extensions to shorter λ will be important for diagnosing nano-bunching in LWFA-driven XFELS [43,44] and nano-prebunching schemes [19]. Second, by conveying the e-bunch after the COTR imaging split-off mirror (see Fig.…”

Section: Discussionmentioning

confidence: 99%

3D structure of microbunched plasma-wakefield-accelerated electron beams

Downer,

LaBerge,

Bowers

et al. 2024

Preprint

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Plasma wakefield accelerators use tabletop equipment to produce relativistic femtosecond electron bunches. Optical and x-ray diagnostics have established that their charge concentrates within a micrometer-sized volume, but its sub-micrometer internal distribution, which critically influences gain in free-electron lasers or particle yield in colliders, has proven elusive to characterize. Here, by simultaneously imaging different wavelengths of coherent optical transition radiation (COTR) that a laser-wakefield-accelerated e-bunch generated when exiting a metal foil, we elucidated the structure of the coherently-radiating component of bunch charge. Key features of the images correlated uniquely with how plasma electrons injected into the wake: by a plasma-density discontinuity, by ionising high-Z gas-target dopants, or by uncontrolled laser-plasma dynamics. With additional input from electron spectra, spatially-averaged COTR spectra, and particle-in-cell simulations, we reconstructed coherent 3D charge structures. The results demonstrate essential metrology for next-generation X-ray free-electron lasers.

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Section: Discussionmentioning

confidence: 99%

3D structure of microbunched plasma-wakefield-accelerated electron beams

Downer,

LaBerge,

Bowers

et al. 2024

Preprint

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Bunch Coherence in Parametric X-Ray Radiation

Artru

Ispirian

2002

Electron-Photon Interaction in Dense Media

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The amplitude of Parametric X-ray radiation emitted coherently by a bunch of electrons crossing a crystal (CPXR) is calculated. When the bunch density is modulated with a longitudinal period close to the X-ray wavelenght, constructive many-electron interferences enhance the intensity by N b × |F (K)| 2 , where N b is the number of electrons in the bunch, F (K) the bunch form factor and K a specified wave vector. CPXR can be used to test the microbunching in a X-ray free-electron laser.

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New applications of non-optical transition radiation for beam diagnostics

Ispirian

2004

Nuclear Instruments and Methods in Physics Research Section A:

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Measurement of very short time ∼10−19–10−17 s structures with the help of X-ray transition radiation

Cited by 10 publications

References 10 publications

3D structure of microbunched plasma-wakefield-accelerated electron beams

3D structure of microbunched plasma-wakefield-accelerated electron beams

Bunch Coherence in Parametric X-Ray Radiation

New applications of non-optical transition radiation for beam diagnostics

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