Abstract
We investigated a diode-pumped multipass disk Yb:KGW amplifier intended for amplifying a train of 3D ellipsoidal pulses of a laser driver for a photocathode of a linear electron accelerator. The multipass amplification geometry permitted increasing the energy of broadband (about 10 nm) pulses with a repetition rate of 1 MHz from 0.12 µJ to 39 µJ, despite large losses (two orders of magnitude) introduced by a beam shaper of 3D ellipsoidal beam. The distortions of the pulse train envelope were minimal due to optimal delay between the moment of pump switching on and arrival of the first pulse of the train.
Highlights
Free electron lasers (FELs) demand for their operation electron beams with high peak current, a small value of normalized transverse emittance, and small energy spread (~0.1%)
With the use of such photoinjectors the possibility to produce beams with parameters needed for FELs was demonstrated
Electron beams in such facilities are modulated in time so that short electron bunches with a duration about units or tens of picoseconds, following with a repetition rate of several megahertz, form relatively long (0.6-10 ms) rectangular trains repeating, in turn, with a frequency of 1-50 Hz [1,2,3,4]
Summary
Free electron lasers (FELs) demand for their operation electron beams with high peak current (on the order of kiloampere after several stages of electron bunch compression), a small value of normalized transverse emittance (less than 1 mm·mrad), and small energy spread (~0.1%). With the use of such photoinjectors the possibility to produce beams with parameters needed for FELs was demonstrated Electron beams in such facilities are modulated in time so that short electron bunches with a duration about units or tens of picoseconds, following with a repetition rate of several megahertz, form relatively long (0.6-10 ms) rectangular trains repeating, in turn, with a frequency of 1-50 Hz [1,2,3,4]. Electron bunches with a charge of 1 nC and normalized transverse emittance of 1.4 mm·mrad at the electron energy of 150 MeV were produced on the FLASH FEL photoinjector based on a linear accelerator for Gaussian laser pulses with a RMS duration of 6 ps.
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