Sep 18 – 24, 2022
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

High-quality electron beams and free electron lasing based on a laser wakefield accelerator at SIOM

Sep 21, 2022, 5:50 PM
Sala Maria Luisa - Hotel Hermitage

Sala Maria Luisa - Hotel Hermitage

Invited talk Special Sub-Session


Ke Feng (SIOM)


Laser wakefield accelerators (LWFAs) are capable of generating ultra-high accelerating gradient up to 100 GV/m, and hold a great potential as a candidate for driving compact free electron lasers (FELs). However, the stability and insufficient beam quality, in terms of energy spread, large initial divergence, present a substantial obstacle to the realization of high-gain FELs. With the in-house developed 200-TW laser system with a repetition rate of 1-5 Hz and a well-designed gas target, a stable and high quality LWFA has been experimentally obtained. Here, we present an experimental demonstration of undulator radiation amplification in the exponential-gain regime. The amplified undulator radiation, typically centered at the 27 nanometers, has a maximum radiation energy of approximate 150 nJ. The maximum gain was estimated to be 100-fold in the third of the three undulators with the orbit kick method, indicating an undoubtable exponential gain. Such a proof-of-principle experiment will expedite the development of future compact facilities with broad applications.

Primary authors

Ke Feng (SIOM) Mr Ruxin Li Mr Wentao Wang (Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS).)

Presentation materials