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Shortening the pulse duration in seeded free-electron lasers by chirped microbunching
Primož Rebernik Ribič, Takashi Tanaka, 2019, original scientific article

Abstract: In externally seeded free-electron lasers (FELs) that rely on a frequency upconversion scheme to generate intense short-wavelength light pulses, the slippage effect in the radiator imposes a lower limit on the FEL pulse duration, which is typically on the order of a few tens of femtoseconds. Recently it was proposed that a combination of a chirped microbunch and a tapered undulator can be used to break this limit. Although the method has the potential to reduce the FEL pulse duration down to a level that cannot be achieved by current state-of-the-art technology, it requires a very short seed pulse (∼ one optical cycle or less), making it challenging to put this concept into practical use. Here, we propose an alternative technique to relax the requirement on the seed pulse length. We show that the modified scheme allows generation of FEL pulses with durations much shorter than that determined by the seed pulse and the slippage effect. The performance of the method, which can easily be implemented at existing seeded FEL user facilities, is evaluated through a campaign of analytical calculations and simulations. For our set of typical seeded FEL parameters, we expect the generation of 1.6 fs long pulses at 26 nm with a peak power of 10 GW using a 20 fs long chirped seed pulse operating at 260 nm.
Keywords: free-electron lasers, short pulses, femtosecond
Published in RUNG: 12.01.2020; Views: 2123; Downloads: 0
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Energy enhancement of the target surface electron by using a 200 TW sub-picosecond laser
J. Y. Mao, 2018, original scientific article

Abstract: One order of magnitude energy enhancement of the target surface electron beams with central energy at 11.5 MeV is achieved by using a 200 TW, 500 fs laser at an incident angle of 72° with a prepulse intensity ratio of 5×10−6. The experimental results demonstrate the scalability of the acceleration process to high electron energy with a longer (sub-picosecond) laser pulse duration and a higher laser energy (120 J). The total charge of the beam is 400±20 pC(
Keywords: Strong field laser physics, Plasmas, Particles, Femtosecond phenomena, Surface dynamics.
Published in RUNG: 07.08.2018; Views: 3558; Downloads: 0
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The CITIUS light source
Sandra Gardonio, Giovanni De Ninno, Barbara Ressel, 2013, published scientific conference contribution abstract

Keywords: femtosecond laser source, time resolved photoemission spectroscopy, correlated electron materials
Published in RUNG: 06.05.2014; Views: 6048; Downloads: 30
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