Theory for the CEBAF infrared and shipboard FELs
Clark, Darwin L.
Colson, William B.
Neighbours. John R.
MetadataShow full item record
The continuing development of the free electron laser (FEL) as a powerful and versatile source of coherent radiation steadily drives toward the goal of high efficiency and broad tenability at shorter wavelengths. New experiments provide significant data and insight for analysis by theoreticians and experimentalists. Two important areas to study are about electron pulse effects, and the dynamics of optical mode distortion by intense electron beam currents. The initial part of this thesis examines one aspect of the projected task of FEL application as a military weapon. The advantages of the FEL over other directed energy sources are detailed, as well as the challenge presented by the effects of the marine atmosphere to high energy laser propagation. The remainder of this thesis examines several effects of long wavelength FELs. Chapter IV examines the proposed parameters of the CEBAF IR FEL, and the analysis leads to predictions describing system performance. Chapter V examines the effects of single pass optical mode distortion for FELs with narrow electron beams. Single-mode theory states that gain is proportional to the product of electron beam current and filling factor, but three dimensional simulations show that gain is a function of electron beam filling factor alone. Also examined is a phenomenon of destructive interference of light in the FEL undulator. Chapter VI extends the analysis of the relationship of gain and beam size to include multiple passes of laser light through the laser resonator. This affirms the general gain relationship, where gain is a function of electron beam filling factor, and also further explores the phenomena of destructive interference within the optical mode.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Christodoulou, A.; Lampiris, D.; Polykandriotis, K.; Colson, W.B.; Crooker, P.P. (2002);We present experiments and simulations showing the behavior of a free-electron laser !FEL" with both positive and negative linear tapers along the wiggler. We show the power desynchronism curve widths, efficiency, exhaust ...
Vigil, Ricardo (Monterey, California: Naval Postgraduate School, 2014-09);In 1979,W. B. Colson and S. K. Ride proposed a new kind of electron accelerator using a uniform magnetic field in combination with a circularly-polarized laser field. A key concept is to couple the oscillating electric ...
Freeman, Will; Karunasiri, Gamani (American Physical Society, 2012);The nonequilibrium absorption of longitudinal-optical phonons by hot electrons are suited in terahertz quantum cascade structures. We present a method for including electron leakage to the continuum that take into account ...