Generation of attosecond coherent X-ray radiation through modulation compression

Abstract

In this paper, we propose a scheme to generate tunable attosecond coherent X-ray radiation for future light source applications. This scheme uses a short-pulse seeding laser, two bunch compressors, and a laser chirper to generate a prebunched, kilo-Ampere current electron beam from an initial 10-Ampere low-current electron beam. Such an electron beam sent into a short undulator generates attosecond coherent soft X-ray radiation. The final X-ray radiation wavelength can be tuned by adjusting the compression factor. It also allows one to control the final radiation pulse length by controlling the seeding laser pulse length or the compression factor. As an illustration, we present an example to generate 1 GW, 200 attosecond, 1 nm coherent X-ray radiation from a 28 A current, 200 nm laser modulated beam.

Generation of subterawatt-attosecond pulses in a soft x-ray free-electron laser

“…X-ray free-electron lasers (FELs) [10,11], which overcome the intensity and photon energy limit of the HHGbased radiation source, provide an alternative way for generating high brightness ultrashort radiation pulses. While a typical x-ray FEL pulse is tens of femtoseconds long, various schemes have been proposed and developed to generate subfemtosecond pulses [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In a FEL, the radiation slips along the electron bunch in the forward direction and gets amplified.…”

Generating Single-Spike Hard X-Ray Pulses with Nonlinear Bunch Compression in Free-Electron Lasers

“…To further shorten the total pulse duration down to the attosecond regime, various ideas have been proposed with the x-ray FELs [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. A common way is based on time slicing of the electron bunch, in which the lasing part of the electron bunch is selectively controlled by an extremely short optical laser pulse, by a slotted foil, or by a bunch tilt with subsequent orbit control [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The slicing scheme uses electron beam with a regular bunch charge, but requires implementing additional hardware in the existing facility.…”

Generation of stable subfemtosecond hard x-ray pulses with optimized nonlinear bunch compression

“…Since the electron bunch length is usually tens of femtoseconds (fs) long, a common way to produce attosecond x-ray pulses is based on time slicing where only a small fraction of the bunch is selected to lase. This process is typically controlled by either an extremely short optical laser pulse [3][4][5][6][7][8][9][10][11][12] or a slotted foil [13]. After this manipulation, the resultant x-ray pulse is much shorter than the whole electron bunch.…”