PAC07 - List of Authors (Sung, C.)

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Sung, C.

Paper	Title	Page
TUPMS040	Development of a THz Seed Source for FEL Microbunching Experiment at the Neptune Laboratory	1275
	S. Tochitsky, C. Joshi, C. Sung UCLA, Los Angeles, California
	Funding: This work is supported by US Department of Energy Grant No. DE-FG03-92ER40727 Seeded FEL/IFEL techniques can be used for modulation of a relativistic electron beam longitudinally on the radiation wavelength. However, in the 1-10 THz range, which is of particular importance for matched injection of prebunched electrons into a laser-driven plasma accelerating structure, a suitable radiation source is not available. At the UCLA Neptune Laboratory we have built and fully characterized a radiation source tunable in the range of 1-3 THz. The THz pulse is produced by mixing two CO2 laser lines in a noncollinear phase-matched GaAs crystal at room temperature. The crystal is pumped by 200 ns pulses of a dual beam TEA CO2 laser running at 1 Hz. A grating placed in each lasing section allowed to cover the spectral range for the difference frequency from 0.5-4.5 THz with a step of 30-40 GHz. The achieved narrow bandwidth of ~10^-5 and the output power of 2kW are sufficient for seeding a single-pass, waveguide FEL amplifier-prebuncher. These pulses were used to measure the coupling efficiency and the attenuation for different types of THz waveguides and the results will be reported. C. Sung et al. "Seeded FEL/IFEL techniques for radiation amplification and electron microbunching in the terahertz range" Phys. Rev. STAB, 2006 (to be published)

Paper

Title

Page

TUPMS040

Development of a THz Seed Source for FEL Microbunching Experiment at the Neptune Laboratory

1275

S. Tochitsky, C. Joshi, C. Sung
UCLA, Los Angeles, California

Funding: This work is supported by US Department of Energy Grant No. DE-FG03-92ER40727

Seeded FEL/IFEL techniques can be used for modulation of a relativistic electron beam longitudinally on the radiation wavelength. However, in the 1-10 THz range, which is of particular importance for matched injection of prebunched electrons into a laser-driven plasma accelerating structure, a suitable radiation source is not available. At the UCLA Neptune Laboratory we have built and fully characterized a radiation source tunable in the range of 1-3 THz. The THz pulse is produced by mixing two CO2 laser lines in a noncollinear phase-matched GaAs crystal at room temperature. The crystal is pumped by 200 ns pulses of a dual beam TEA CO2 laser running at 1 Hz. A grating placed in each lasing section allowed to cover the spectral range for the difference frequency from 0.5-4.5 THz with a step of 30-40 GHz. The achieved narrow bandwidth of ~10^-5 and the output power of 2kW are sufficient for seeding a single-pass, waveguide FEL amplifier-prebuncher*. These pulses were used to measure the coupling efficiency and the attenuation for different types of THz waveguides and the results will be reported.

* C. Sung et al. "Seeded FEL/IFEL techniques for radiation amplification and electron microbunching in the terahertz range" Phys. Rev. STAB, 2006 (to be published)