Colson, W. B.

Paper	Title	Page
MOAAU02	Evolution of FELs Over the Last 34 Years	14
	W. B. Colson NPS, Monterey, California
	The concept of the free electron laser (FEL) started 34 years ago with Madey's 1972 paper. The basic mechanism which employs a beam of free electrons to amplify co-propagating light has remained essentially the same as further developments have demonstrated high peak power, high average power, high gain, optical guiding, continuous tunability and reliability. FELs have operated at wavelengths from the far infrared, infrared, visible and down to the ultraviolet. The realization of high gain has lead to the generation of soft x-rays and soon hard x-rays where there are no mirrors. About a hundred FELs and user facilities are distributed around the world, and in many ways the FEL has become a "perfect" source of coherent electromagnetic radiation. FELs are in encyclopedias, in laser textbooks, with several textbooks specifically on FELs, and have clarified several physical principles for stimulated emission and laser physics. Today a Google search on "free electron lasers" produces nearly 13 million hits. The accomplishments during this time have been many, but none so important as establishing a community. Prospects for future directions are also briefly considered.
	Slides
	Talk
MOPPH075	Simulations of High Power-FEL Amplifiers	222
	J. Blau, D. T. Burggraff, W. B. Colson, T. Voughs NPS, Monterey, California
	FEL amplifier simulations have been updated and parallelized, and system vibration effects have been added. The simulations are used to study proposed high-power amplifier FELs at LANL and BNL. We look at the single-pass gain and output power, including the effects of wiggler tapering, electron beam pinching, and shifting and tilting of the electron beam.
THAAU03	A Scalloped Electron Beam Free-Electron Laser	509
	D. C. Nguyen LANL, Los Alamos, New Mexico W. B. Colson NPS, Monterey, California H. Freund SAIC, McLean
	Typical high-gain FEL amplifiers employ an electron beam that is matched to the wiggler so that the envelope remains constant throughout the wiggler. This paper describes a novel approach in which the electrons undergo natural betatron scalloping motion along the wiggler because the beams are deliberately mismatched at the wiggler entrance. We present an analysis of the electron scalloping motion and the FEL interaction with a scalloped electron beam. For a representative set of beam and wiggler parameters, we discuss the effect of the pinching the electron beams on the interaction in the FEL and on the focusing and propagation of the FEL radiation.
	Slides
	Talk
THPPH071	Free Electron Lasers in 2006	756
	W. B. Colson, J. Blau, A. Kampouridis NPS, Monterey, California
	Twenty-nine years after the first operation of the short wavelength free electron laser (FEL) at Stanford University, there continue to be many important experiments, proposed experiments, and user facilities around the world. Properties of FELs in the infrared, visible, UV, and x-ray wavelength regimes are listed and discussed.