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Proceedings Paper

The Darmstadt Near-Infrared Free-Electron Laser
Author(s): Volker Aab; Klaus Alrutz-Ziemssen; Harald Genz; Hans-Dieter Graf; Achim Richter; Hans Weise; Andreas Gaupp
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Paper Abstract

A near-infrared Free-Electron-Laser is under construction at the newly erected superconducting 130 MeV electron accelerator. The first part of the accelerator went into operation last summer at the Institute of Nuclear Physics of the Technische Hochschule Darmstadt. Utilizing the electron beam tunable between 35 and 50 MeV and a hybrid undulator with K=1 and λ = 3.2 cm it becomes possible to build a cw-laser which will emit in a wavelength region from 5.24 to 2.57 μm. Presently the room temperature injection of the linac is converted into a high current injection, since peak currents of 2.7 A are required for the FEL experiment. A micropulse repetition rate of 10 MHz (300th subharmonic of the accelerator frequency) that matches the length of the optical cavity (15 m), together with the low emittance (en = 2 π mm mrad) and the low energy spread (ΔE ≤ 13 keV) required in the injector allows to transport a charge of about 10 pC per microbunch which is sufficient for the planned FEL experiment. As an undulator a hybrid system consisting of 80 periods of permanent magnet material and tunable poles of high permeable material is chosen. Simulations predicting the performance of the FEL exhibit a peak output power of 300 to 500 kW in the wavelength region considered. The scientific program deals with the development of the FEL, its components and a possible future use of the FEL radiation, which will be unique with respect to the features region of wavelength, tunability, pulse time structure and cw-mode.

Paper Details

Date Published: 26 December 1989
PDF: 7 pages
Proc. SPIE 1133, Free Electron Lasers II, (26 December 1989); doi: 10.1117/12.961602
Show Author Affiliations
Volker Aab, Institut fur Kernphysik (Germany)
Klaus Alrutz-Ziemssen, Institut fur Kernphysik (Germany)
Harald Genz, Institut fur Kernphysik (Germany)
Hans-Dieter Graf, Institut fur Kernphysik (Germany)
Achim Richter, Institut fur Kernphysik (Germany)
Hans Weise, Institut fur Kernphysik (Germany)
Andreas Gaupp, BESSY (Germany)

Published in SPIE Proceedings Vol. 1133:
Free Electron Lasers II
Yves Petroff, Editor(s)

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