longitudinal space charge assisted echo seeding of a free electron laser

Kirsten Hacker

doi:10.1117/12.2181957

12 May 2015 longitudinal space charge assisted echo seeding of a free electron laser

Kirsten Hacker

Proceedings Volume 9512, Advances in X-ray Free-Electron Lasers Instrumentation III; 95121D (2015) https://doi.org/10.1117/12.2181957
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

Seed lasers are employed to improve the temporal coherence of free-electron laser light. However, when seed pulses are short relative to the particle bunch, the noisy, temporally incoherent radiation from the un-seeded electrons can overwhelm the coherent, seeded radiation. In this paper a new seeding mechanism to improve the contrast between coherent and incoherent free electron laser radiation is employed together with a novel, simplified echo-seeding method. The concept relies on a combination of longitudinal space charge wakes and an echo-seeding technique to make a short, coherent pulse of FEL light together with noise background suppression. Several different simulation codes are used to illustrate the concept with conditions at the soft x-ray Free-electron LASer in Hamburg, FLASH. The impacts of coherent synchrotron radiation, intra beam scattering, and high peak current operation are investigated.

Citation Download Citation

Kirsten Hacker "longitudinal space charge assisted echo seeding of a free electron laser", Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 95121D (12 May 2015); https://doi.org/10.1117/12.2181957

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