PAC09 - List of Authors (Miyahara, F.)

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Miyahara, F.

Paper	Title	Page
WE5RFP052	Development of Accelerator-Based THz Sources at Tohoku University	2386
	H. Hama, F. Hinode, M. Kawai, F. Miyahara, K. Nanbu, M. Yasuda Tohoku University, School of Scinece, Sendai
	To develop a coherent Terahertz (THz) light sources, producing very short electron bunch has been progressed at Laboratory of Nuclear Science, Tohoku University. We have developed an independently-tunable-cells (ITC) RF gun consisted with two cavities and thermionic cathode in order to produce bunch length around a hundred femto-second. Possibility of pre-bunched FEL is investigated by numerical simulations. In case of the bunch length shorter than wavelength, the FEL interaction seems to be different from conventional way. High intensity and short FEL pulse is possibly obtained . In a broad band regime, coherent spontaneous THz radiation has been developed. A ring type source consisted with isochronous arcs can provide the coherent THz pulses from every bending magnets. The project has aimed multi-user facility . In addition, a compact DC gun is also under development. Measured normalized emittance is less than 1μrad for a beam energy of 50 keV and a beam current of 300 mA. This low emittance beam is quite suitable for driving Smith-Purcell Backward Wave Oscillator FEL in THz region. Detail of the DC gun and prospect will be presented *. M. Yasuda et al., Proc. FEL08, (2008) in press. H. Hama et al., New J. Phys. 8 (2006) 292. *K. Kasamsook et al., Proc. FEL07, (2007) 417 - 420.

Paper

Title

Page

WE5RFP052

Development of Accelerator-Based THz Sources at Tohoku University

2386

H. Hama, F. Hinode, M. Kawai, F. Miyahara, K. Nanbu, M. Yasuda
Tohoku University, School of Scinece, Sendai

To develop a coherent Terahertz (THz) light sources, producing very short electron bunch has been progressed at Laboratory of Nuclear Science, Tohoku University. We have developed an independently-tunable-cells (ITC) RF gun consisted with two cavities and thermionic cathode in order to produce bunch length around a hundred femto-second. Possibility of pre-bunched FEL is investigated by numerical simulations. In case of the bunch length shorter than wavelength, the FEL interaction seems to be different from conventional way. High intensity and short FEL pulse is possibly obtained *. In a broad band regime, coherent spontaneous THz radiation has been developed. A ring type source consisted with isochronous arcs can provide the coherent THz pulses from every bending magnets. The project has aimed multi-user facility **. In addition, a compact DC gun is also under development. Measured normalized emittance is less than 1μrad for a beam energy of 50 keV and a beam current of 300 mA. This low emittance beam is quite suitable for driving Smith-Purcell Backward Wave Oscillator FEL in THz region. Detail of the DC gun and prospect will be presented ***.

*M. Yasuda et al., Proc. FEL08, (2008) in press.
**H. Hama et al., New J. Phys. 8 (2006) 292.
***K. Kasamsook et al., Proc. FEL07, (2007) 417 - 420.