Work

Extraction of the longitudinal profile of the transverse emittance from single-shot RF deflector measurements at sFLASH

Year: 2024

Type: article

Abstract: The gain length of the free-electron laser (FEL) process strongly depends on the slice energy spread, slice emittance, and current of the electron bunch. At an FEL with only moderately compressed electron bunches, the slice energy spread is mainly determined by the compression process. In this regime, single-shot measurements using a transverse deflecting rf cavity enable the extraction of the longitudinal profile of the transverse emittance. At the free-electron laser FLASH at DESY, this technique was used to determine the slice properties of the electron bunch set up for seeded operation in the sFLASH experiment. Thereby, the performance of the seeded FEL process as a function of seed laserelectron timing can be predicted from these slice properties with the semi-analytical Ming-Xie model. The prediction is well in line with the FEL peak power observed during an experimental laser-electron timing scan. The power profiles of the FEL pulses were reconstructed from the longitudinal phase-space measurements of the seeded electron bunches that were measured with the transverse deflecting cavity.

Source: European XFEL

Authors: Plath T., Khan S., Amstutz Ph., Lazzarino L.L., Miltchev V., Roßbach J., Maltezopoulos, Theophilos, Bödewadt J., Laarmann T., Lechner C., Ekanayake N.

Language: English

Topic: Particle Accelerators and Free-Electron Lasers

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung

Award: Verbundprojekt FSP 302 - Freie-Elektronen-Laser: Beschleunigerphysik - Konzept und Vision. Teilprojekt 3: EEHG bei FLASH und FLASH II

OpenAlex ID: W7132295407

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