| Paper |
Title |
Page |
| TUPMS037 |
Simulation of an Iris-guided Inverse Free-electron Laser Micro-bunching Experiment
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1266 |
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- J. T. Frederico
- G. Gatti
INFN/LNF, Frascati (Roma)
- S. Reiche, R. Tikhoplav
UCLA, Los Angeles, California
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The Free-Electron Laser code Genesis 1.3 has been modified to include waveguides within the undulator, reducing the diffraction effects for long wavelength FELs. Several types of waveguides are considered, which are rectangular and circular waveguides as well as iris-loaded open waveguides. Studies are presented here on the enhancement of FEL and IFEL with these wave-guiding structures in comparison to free-space propagation of the radiation wave.
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| THPMS026 |
The UCLA Helical Permanent-Magnet Inverse Free Electron Laser
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3055 |
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- R. Tikhoplav
- J. T. Frederico, G. Reed, J. B. Rosenzweig, S. Tochitsky, G. Travish
UCLA, Los Angeles, California
- G. Gatti
INFN/LNF, Frascati (Roma)
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The Inverse Free Electron Laser (IFEL) is capable, in principle, of reaching accelerating gradients of up to 1 GV/m making it a prospective accelerator scheme for linear colliders. The Neptune IFEL at UCLA utilizes a 15 MeV Photoinjector-generated electron beam of 0.5 nC and a CO2 laser with peak energy of up to 100 J, and will be able to accelerate electrons to 100 MeV over an 80 cm long, novel helical permanent-magnet undulator. Past IFELs have been limited in their average accelerating gradient due to the Gouy phase shift caused by tight focusing of the drive laser. Here, laser guiding is implemented via an innovative Open Iris-Loaded Waveguide Structure scheme which ensures that the laser mode size and wave front are conserved through the undulator. The results of the first phase of the experiment are discussed in this paper, including the design and construction of a short micro-bunching undulator, testing of the OILS waveguide, as well as the results of corresponding simulations.
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