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Design Considerations for a High-Efficiency High-Gain Free-Electron Laser for Power Beaming. C. Muller and G. Travish UCLA Department of Physics & Astronomy, Los Angeles CA. USA. The Concept. Comments. The Design. Abstract. . Compression & Diffraction. . …. Prototype Design.
Design Considerations for a High-Efficiency High-Gain Free-Electron Laser for Power Beaming
C. Muller and G. TravishUCLA Department of Physics & Astronomy, Los Angeles CA. USA
Compression & Diffraction
Selected initial parameters for study
Opinions on High Power FELs
The authors thank Professor James Rosenzweig for supporting and encouraging this work, and Sven Reiche for helping us with Genesis 1.3 as well as holding many fruitful discussions.
GOAL: Produce 1 kW electricity in space.
Optimization of a high-gain FEL yielded a system capable of producing 1 KW of electric power in space using a 40 m undulator and a ≈100 KW electron beam. This design relies on improvements to photoinjectors and lasers that may allow for high repetition-rate, high-brightness beam production and for high-power seeding of the FEL.
Measured output of a standard silicon solar cell as a function of incident wavelength . The dashed line indicates the ideal (unity quantum efficiency) spectral response.
Power Beaming from Ground to Space Using:
Simulation & Optimization
FEL Power Beaming:
K.-J. Kim, et al., Proc. FEL Conf. 1997.
M. C. Lampel, et al., Rocketdyne Internal (1993).
Laser Space Power:
G. A. Landis, IEEE Aerospace and Electronics Systems, Vol. 6 No. 6, pp. 3-7, Nov. 1991.
G. A. Landis, Acta Astronautica , Vol. 25 No. 4, pp. 229-233 (1991)
J. Benford and R. Dickinson, Intense Microwave Pulses III, H. Brandt, Ed.,SPIE 2557, 179 (1995).
P. Glaser, Science, 162 3856, pp 857-861 (1968).
High Power FEL:
D. Douglas, Proc. LINAC 2000
S. Reiche, NIM A429, 243 (1999).
Analysis begins by estimating efficiencies and ground optical power required.
Power beaming assumed efficiencies. The assumptions are based on simplistic arguments, and are meant only to provide an order-of-magnitude estimate of the energy requirements.
Efficiencies as high as 13% were achieved, but with an unrealistically long (150 m) undulator.
It is important to note that while the efficiencies listed are reasonable estimates, the strong effect of atmospheric turbulence has not been taken into account. Here we assume that techniques such as adaptive optics can be used to limit the effect of the atmosphere.
The FEL efficiency is to be maximized by simulation. 10% was taken as a starting goal.
We assume a 60% wall plug to RF efficiency and a 10% RF to beam efficiency.
Work supported by DOE BES grant DE-FG03-98ER45693
Work supported by ONR grant N00014-02-1-0911