JLAB, Newport News, Virginia
Jefferson Laboratory is proposing to construct a next generation light source that capitalizes on the existing infrastructure of the Energy Recovery Linac (ERL) based Free Electron Laser (FEL) that has been operational since 1998. The new user facility, called JLAMP, will feature a two-pass superconducting linac to accelerate electron bunches to 600MeV with the possibility of energy recovery. The photon source will be a seeded amplifier FEL that covers the 10 to 100eV energy range, capable of providing up to seven orders of magnitude increase in average brightness over existing sources. At longer wavelengths the device will also have the option of operating as a high gain resonator for users who desire a higher repetition rate. The design options and technical challenges associated with the development of the JLAMP machine are presented here.
JLAB, Newport News, Virginia
ATF, Boulder
Twente University, Laser Physics and Non-Linear Optics Group, Enschede
We report the design, and broadly tunable operation, for the first time, of a high average power free-electron laser using edge-outcoupling. Using the FEL in this configuration, we achieved a maximum stable output power of 270W at 2.53 μm, and could tune with an output of 20 W or higher from 0.8 to 4.2 μm. The output was in the form of a continuous train of sub-ps pulses at 4.68 MHz. Measurements of gain, loss, and the output mode are compared with models.
JLAB, Newport News, Virginia
In this paper we report a direct experimental investigation of optical frequency chirping effects induced by ultrashort electron bunches in a high-gain energy-recovery-linac (ERL) free-electron laser (FEL) cavity. Our measurement and analysis shows clear evolution of the optical pulse chirp verses the electron bunch energy chirp. Further study also provides important evidence that under certain conditions much shorter FEL pulses can be obtained through properly chirping electron bunches and optical pulse compression. Although studies about the chirp measurement on Self-amplified-spontaneous-emission (SASE) FEL were reported recently, we believe this paper for the first time provides a comprehensive and close observation into the very unique temporal and spectral characteristics of ultrashort optical pulses from a high-gain ERL FEL. This is made possible by the stable operation and unique capability of the Jefferson Lab machine to change the electron bunch energy chirp with no curvature. Preliminary simulations will also be presented.
