X-ray free-electron lasing in a flying-focus undulator

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F10974938%3A_____%2F25%3A25_89_05" target="_blank" >RIV/10974938:_____/25:25_89_05 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1038/s42005-025-02028-x" target="_blank" >https://doi.org/10.1038/s42005-025-02028-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s42005-025-02028-x" target="_blank" >10.1038/s42005-025-02028-x</a>

Result language

angličtina

Original language name

X-ray free-electron lasing in a flying-focus undulator

Original language description

Laser-driven free-electron lasers (LDFELs) replace magnetostatic undulators with the electromagnetic fields of a laser pulse. Because the undulator period is half the wavelength of the laser pulse, LDFELs can amplify X rays using lower electron energies and over shorter interaction lengths than a traditional free-electron laser. In LDFELs driven by conventional laser pulses, the undulator uniformity required for high gain necessitates large laser-pulse energies. Here, we show that a flying-focus pulse provides the undulator uniformity required to reach high gain with a substantially lower energy than a conventional pulse. The flying-focus pulse features an intensity peak that travels in the opposite direction of its phase fronts. This enables an LDFEL configuration where an electron beam collides head-on with the phase fronts and experiences a near-constant undulator strength as it co-propagates with the intensity peak. Three-dimensional simulations of this configuration demonstrate the generation of megawatts of coherent X-ray radiation with 20 x less energy than a conventional laser pulse.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

—

Continuities

R - Projekt Ramcoveho programu EK

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

communications physics

ISSN

2399-3650

e-ISSN

—

Volume of the periodical

8

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

1-10

UT code for WoS article

001450001800001

EID of the result in the Scopus database

2-s2.0-105000807712