Open AccessUsing irregularly spaced current peaks to generate an isolated attosecond X‐ray pulse in free‐electron lasers
Author(s) -
Tanaka Takashi,
Parc Yong Woon,
Kida Yuichiro,
Kinjo Ryota,
Shim Chi Hyun,
Ko In Soo,
Kim Byunghoon,
Kim Dong Eon,
Prat Eduard
Publication year - 2016
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577516013345
Subject(s) - pulse (music) , laser , optics , attosecond , physics , electron , power (physics) , current (fluid) , pulse duration , cathode ray , contrast (vision) , atomic physics , ultrashort pulse , detector , quantum mechanics , thermodynamics
A method is proposed to generate an isolated attosecond X‐ray pulse in free‐electron lasers, using irregularly spaced current peaks induced in an electron beam through interaction with an intense short‐pulse optical laser. In comparison with a similar scheme proposed in a previous paper, the irregular arrangement of current peaks significantly improves the contrast between the main and satellite pulses, enhances the attainable peak power and simplifies the accelerator layout. Three different methods are proposed for this purpose and achievable performances are computed under realistic conditions. Numerical simulations carried out with the best configuration show that an isolated 7.7 keV X‐ray pulse with a peak power of 1.7 TW and pulse length of 70 as can be generated. In this particular example, the contrast is improved by two orders of magnitude and the peak power is enhanced by a factor of three, when compared with the previous scheme.