Compact laser-plasma-accelerator-driven free-electron laser using a transverse gradient undulator | Zendy

Zhirong Huang | Zendy; Panagiotis Baxevanis | Zendy; C. Benedetti | Zendy; Yuantao Ding | Zendy; Ronald D. Ruth | Zendy; C. B. Schroeder | Zendy; D. Wang | Zendy; T. Zhang | Zendy

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Compact laser-plasma-accelerator-driven free-electron laser using a transverse gradient undulator

Author(s) -

Zhirong Huang,

Panagiotis Baxevanis,

C. Benedetti,

Yuantao Ding,

Ronald D. Ruth,

C. B. Schroeder,

D. Wang,

T. Zhang

Publication year - 2016

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.4965608

Subject(s) - undulator , physics , thermal emittance , free electron laser , laser , optics , particle in cell , particle accelerator , plasma , electron , transverse plane , jitter , cathode ray , plasma acceleration , beam (structure) , nuclear physics , electrical engineering , engineering , structural engineering

Laser-plasma accelerators can produce a few GeV electron beams over a distance of a few cm. Such beams typically have relatively low emittance and high peak current but a rather large energy spread and jitter. The large energy spread hinders the potential applications for coherent free-electron laser (FEL) radiation generation. In this paper, we discuss a method to compensate the effects of beam energy spread by introducing a transverse variation of the undulator magnetic field. Such a transverse gradient undulator (TGU) together with a properly dispersed beam can greatly reduce the effects of electron energy spread and jitter on FEL performance. We review the TGU concept and theory and discuss technical implementations. Using particle-in-cell simulations of a GeV laser-plasma accelerator and the FEL simulation code GENESIS that is modified to accommodate TGU, we show a soft x-ray FEL operating in the “water window” wavelengths can reach saturation with a undulator length of about 12 m.

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