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.
SAIC, McLean
JLAB, Newport News, Virginia
Mesa+, Enschede
We describe a procedure for the simulation of free-electron laser oscillators. The simulation uses a combination of the MEDUSA simulation code for the FEL and the OPC code to model the resonator. The simulations are compared with recent observations of the oscillator at the Thomas Jefferson National Accelerator Facility and are in substantial agreement with the experiment.
Hampton University, Hampton, Virginia
Yale University, Physics Department, New Haven, CT
Muons, Inc, Batavia
JLAB, Newport News, Virginia
UNRI, Riau
Cosmology provides evidence that most of the mass of the observable universe cannot be associated with any of the known Standard-Model elementary particles. Evidence of this ‘dark matter' was also obtained in the recent data from space telescopes. Axions - hypothetical particles proposed to solve a strong CP problem in Quantum Chromodynamics - are dark matter candidates. Although they carry zero electric charge, they can be produced via Primakoff mechanism, resulting in predictable effects in the laboratory. We present first results from an ongoing LIPSS experiment to search for axion-like particles with Jefferson Lab's Free Electron Laser.