Generation Of Ultrashort X-ray Pulses Research Articles

Electron-Beam-Based Sources of Ultrashort X-ray Pulses

A review of various methods for generation of ultrashort X-ray pulses using relativistic electron beam from conventional accelerators is presented. Both spontaneous and coherent emission of electrons are considered.

Recent Progress in Ultrafast X‐ray Diffraction

X-ray diffraction with femtosecond time-resolution represents a direct probe of ultrafast structural changes in condensed matter. The generation of ultrashort X-ray pulses in laser-driven plasma and/or accelerator-based sources has made substantial progress, and has allowed for studies of transient structures with an unprecedented accuracy. Herein, recent work on transient crystalline structures is reviewed, with the focus on laser-based experiments.

Photoinjector generation of a flat electron beam with transverse emittance ratio of 100

The generation of a flat electron beam directly from a photoinjector is an attractive alternative to the electron damping ring as envisioned for linear colliders. It also has potential applications to light sources such as the generation of ultra-short x-ray pulses or Smith-Purcell free electron lasers. In this Letter, we report on the experimental generation of a flat-beam with a measured transverse emittance ratio of $100\pm 20.2$ for a bunch charge of $\sim 0.5$ nC; the smaller measured normalized root-mean-square emittance is $\sim 0.4$ $\mu$m and is limited by the resolution of our experimental setup. The experimental data, obtained at the Fermilab/NICADD Photoinjector Laboratory, are compared with numerical simulations and the expected scaling laws.

High-average-power 2-kHz laser for generation of ultrashort x-ray pulses

We describe a Ti:sapphire-based laser-x-ray system specifically designed for generation of ultrafast x-ray pulses in the tenths-of-nanometers spectral range at a 2-kHz repetition rate. To obtain high-contrast laser pulses we divide the laser system into a section for generation of microjoule, high-contrast pulses with pulse cleaning and a subsequent section for chirped-pulse amplification and pulse compression. This laser section operates in conjunction with an x-ray-generation section based on a moving copper wire in a He atmosphere. The high reliability of the entire system permits maintenance-free production of x-ray pulses over tens of hours. Average x-ray fluxes of 10(13) photons/(s 4pi sr 1 keV) at 3 keV and 10(9) photons/(s 4pi sr) above 5 keV of photon energy are produced.

Femtosecond x-ray pulses of synchrotron radiation.

A method capable of producing femtosecond pulses of synchrotron radiation is proposed. It is based on the interaction of femtosecond light pulses with electrons in a storage ring. The application of the method to the generation of ultrashort x-ray pulses at the Advanced Light Source of Lawrence Berkeley National Laboratory has been considered. The same method can also be used for extraction of electrons from a storage ring in ultrashort series of microbunches spaced by the periodicity of light wavelength.

A proposal for the generation of ultra-short X-ray pulses

In this paper it is shown that optical stochastic cooling in a 150 MeV electron storage ring will allow production of a beam with a longitudinal emittance of 3 × 10−6MeV/m. Such a small emittance accompanied with a bunch compression technique based upon the transformation in the longitudinal phase space will allow achieving a bunch length of 30 μm. This bunch could then be used for the generation of ultra-short X-ray pulses by Compton scattering of laser photons.

Generation of superstrong optical fields on the basis on high-power femtosecond laser systems with excimer amplification and experiments on the generation of ultrashort x-ray pulses

Generation of superstrong optical fields on the basis on high-power femtosecond laser systems with excimer amplification and experiments on the generation of ultrashort x-ray pulses

Generatsiya sverkhsil'nykh opticheskikh polei na osnove moshchnykh femtosekundnykh lazernykh sistem s eksimernym usileniem i eksperimenty po generatsii sverkhkorotkikh rentgenovskikh impul'sov

Генерация сверхсильных оптических полей на основе мощных фемтосекундных лазерных систем с эксимерным усилением и эксперименты по генерации сверхкоротких рентгеновских импульсов, Гордиенко В.М., Коротеев Н.И., Платоненко В.Т.

Generation of ultrashort x-ray pulses.

We report on the characterization of ultrashort (<10 psec at 1 keV), high-brightness (${10}^{20}$ photons/sec ${\mathrm{mm}}^{2}$eV into 2\ensuremath{\pi} sr at 1 keV) x-ray pulses. The pulses are generated by exciting a preformed laser-produced plasma using an \ensuremath{\sim}1 GW, picosecond laser pulse. Time-resolved measurements of the x-ray emission from a solid Au target are presented as well as the variation in the yield with laser energy and the angle of incidence. Time-integrated x-ray emission yields and spectra are presented for Si, Ti, and Au solid targets. Physical mechanisms responsible for the x-ray generation are discussed.