22–26 Aug 2022
Trieste Convention Centre
Europe/Zurich timezone

First Observation of Laser-Beam Interaction in a Dipole Magnet

TUBO4
23 Aug 2022, 12:20
25m
Auditorium Generali (Trieste Convention Centre)

Auditorium Generali

Trieste Convention Centre

viale Miramare, 24/2 Trieste - Italy
Contributed Oral Seeded FEL Seeded FELs

Speaker

Jiawei Yan (European XFEL GmbH)

Description

Recently, a self-modulation scheme was proposed and experimentally demonstrated for enhancing energy modulation in seeded FELs [1], thereby significantly reducing the requirement of an external laser system. Driven by this scheme, an electron beam with a laser-induced energy modulation as small as 1.8 times the slice energy spread is used for lasing at the 7th harmonic of a 266-nm seed laser in a single-stage high-gain harmonic generation (HGHG) setup and the 30th harmonic of the seed laser in a two-stage HGHG setup. Moreover, using this scheme, we report the first observation of the laser-beam interaction in a pure dipole magnet [2] in which the electron beam energy modulation with a 40-keV amplitude and a 266-nm period is measured. We demonstrate that such an energy modulation can be used to launch a seeded FEL, that is, lasing at the sixth harmonic of the seed laser in a high-gain harmonic generation scheme. The results reveal the most basic process of the FEL lasing and open up a new direction for the study and exploitation of laser-beam interactions.

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Primary authors

Jiawei Yan (European XFEL GmbH) Haixiao Deng (Shanghai Advanced Research Institute Chinese Academy of Science) Zhentang Zhao (Shanghai Synchrotron Radiation Facility)

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