[Jlab-seminars] COLLOQUIUM REMINDER

[Mary Fox]

*COLLOQUIUM
Wednesday, December 15, 2010
CEBAF Center AUD.
4pm with coffee and cookies at 3:45

"The Dawn of Higher Energy Photon Science at Jefferson Lab - Initial 
Lasing results from the UV Demo Free-Electron Laser" *

*Michelle Shinn and Steve Benson *

The Jefferson Lab FEL facility was always envisioned as having both an 
infrared and an ultraviolet (UV) free-electron laser. Recently we have 
completed the UV electron beam-line, installed the optics and started 
commissioning of the UVFEL operated at both a red wavelength and in the 
violet and ultraviolet region. This region is much more challenging than 
the IR region due to a much greater sensitivity to the electron beam 
quality and to mirror heating. We were therefore pleasantly surprised to 
find that the lasing has been extremely robust, with gains of more than 
100% per pass and an efficiency of almost 1%. Though mirror heating is 
substantial, we have achieved over 100 Watts even at the ultraviolet 
wavelength of 370 nm and 200 W at 400 nm. We are making a concerted 
effort to try to match simulated results to the experimental results and 
have found that reasonable agreement is found when three-dimensional 
guiding effects are included in the simulations. We now plan to operate 
with a hole output coupler that will allow us to push to much higher 
photon energies. These runs take advantage of higher harmonic 
wavelengths naturally produced in the FEL. Initial experiments are 
planned to use light with a photon energy of 10 eV. In this presentation 
we will discuss the experiments that motivated the construction of this 
machine and outline some of the proposed experiments in the vacuum 
ultraviolet.

This work was supported by U.S. DOE Contract No. DE-AC05-84-ER40150, the 
Air Force Office of Scientific Research, DOE Basic Energy Sciences, the 
Office of Naval Research, and the Joint Technology Office.
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