Design of High-Power CW IR-THz Source for the Radiation Source ELBE Upgrade


Design of High-Power CW IR-THz Source for the Radiation Source ELBE Upgrade

Evtushenko, P.; Lehnert, U.; Michel, P.; Cowan, T.

The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) is a user facility based on a 1 mA - 40 MeV CW SRF LINAC. Presently HZDR is considering upgrade options for the ELBE or its replace- ment with a new CW, SRF LINAC-based user facility. A part of the user requirements is the capability to generate IR and THz pulse in the frequency range from 0.1 through 30 THz, with pulse energies in the range from 100 J through a few mJ, at the repetition rate between 100 kHz and 1 MHz. This corresponds to the pulse energy in- crease, dependent on the wavelength by a factor from 100 through 1000. In this contribution, we outline key aspects of a concept, which would allow to achieve such parame- ters. Such key aspects are: 1 - use of a beam with longitu- dinal density modulation and bunching factor of about 0.5 at the fundamental frequency; 2 - achieving the density modulation through the mechanism similar to the one used in optical klystron (OK) and HGHG FEL; 3 - gener- ating necessary for the modulation optical beam by an FEL oscillator, and 4 - using two electron injectors, where one injector provides beam for the FEL oscillator while second high charge injector provides beam for the high energy per pulse generation for user experiments. All-in- all the concept of the new radiation source is very similar to an OK, but operating with two beams simultaneously.

Keywords: Superradiant Undulator; THz; SRF LINAC; Undulator radiation; modulated beam

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Publ.-Id: 32850