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TUP034 |
A New 4D Model of Short-pulse FEL Oscillators | |
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Funding: This work has been supported by the Office of Naval Research and the High Energy Laser Joint Technology Office. At the Naval Postgraduate School, we have recently developed a new 4D (x,y,z,t) model for FEL oscillators where the pulse length is comparable to the slippage distance. The model follows multiple transverse and longitudinal optical modes over many passes through a resonator, including the effects of diffraction, pulse slippage and desynchronism. The code is parallelized to run on a cluster computer, and the resonator optics are self-contained, so no external optics program is necessary. The mirrors and the electron beam can be shifted or tilted off-axis to study misalignment effects. This new model is useful for studying the combined effects of longitudinal and transverse modes, the trapped particle instability, and the development of sidebands. The model is currently being validated by comparison to analytic formulas and other FEL codes, as well as existing and proposed FEL experiments. Results of these studies and examples of various effects that this new model can be used to understand will be presented. |
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TUP051 |
Coherent Radiation Sources Driven by Superconducting Spoke Accelerators | |
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Funding: This work has been supported by the Office of Naval Research and the High Energy Laser Joint Technology Office. The NPS FEL Group and Niowave are collaborating to design several FEL systems using superconducting spoke RF cavities. Accelerators reaching electron beam energies of 2MeV to 75MeV with milliamps of average current are considered to drive FELs using a short ten period undulator, approximately 30cm long. The coherent radiation ranges from THz to infrared depending on the electron beam energy. In the 2MeV accelerator, the radiation process can be super-radiant due to the long millimeter wavelength, while the 40MeV accelerator generates infrared wavelengths in a conventional FEL oscillator configuration. An intermediate 8MeV accelerator powers an FEL oscillator with short picosecond pulses providing a kilowatt of THz power in a compact source. Compton backscattering is described to generator incoherent, but monochromatic x-rays for medical applications. |
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| TUP088 | Free Electron Lasers in 2014 | 580 |
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Funding: This work has been supported by the Office of Naval Research and the High Energy Laser Joint Technology Office. Thirty-eight 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 tabulated and discussed. |
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