Kyoto IAE, Kyoto
UVSOR, Okazaki
We proposed a table-top seeded THz FEL amplifier using a multi-bunch photocathode RF gun and injection-seeded terahertz parametric generator (IS-TPG) [1]. Although the first numerical study was carried out under simplified condition [2], a slippage effect, which has prominent effect to long wavelength FEL was not taken into account. In order to discuss feasibility and expected THz output power, start-to-end simulation of FEL was performed by simulation code Parmela [3] and 3D time-dependent FET simulation code GENESIS 1.3 [4]. The peak output power of about 10 kW at 185μm was expected from the design scheme.
[1] K. Kawase, et al., Applied Physic Letters 80(2002),p195
[2] T. Kii, et al., Proc. of FEL2008, in press.
[3] L.M. Young, et al., PARMELA, LA-UR-96-1835,(2001)
[4] S. Reiche, NIM A429(1999) p242.
Kyoto IAE, Kyoto
KAERI, Daejon
UVSOR, Okazaki
A mid-infrared free electron laser facility has been constructed for developing energy materials in Institute of Advanced Energy, Kyoto University. The accelerator has been installed and FEL gain saturation at 13.2 μm has been achieved in May 2008. The FEL power of about 3 MW has been observed at the accelerator room. We have constructed the FEL transport system from the accelerator room to the user room. The beam characterization at user room and preparation of the application of MIR-FEL will be introduced in the conference.
Kyoto IAE, Kyoto
UVSOR, Okazaki
A new type of undulator which consists of high-temperature superconductor bulk magnets in the staggered array configuration inside a solenoid is being developed, aimed at short period, high undulator field and controllability by the solenoid current.[1] In order to develop a numerical model, the field calculations were performed and comparisons were made with prototype measurements at the liquid nitrogen temperature. The field in the bulk magnet was modeled by loop currents of which amounts were determined by the critical current density which follow Bean model.[2] In the unsaturated condition, which is decided by the critical current density and the dimension of the bulk magnets, the field distributions and the dependence on the solenoid field were reproduced well. We then estimated the unsaturated performance at the liquid helium temperature, where increment of the critical current density is known [3] and significant improvement of the undulator performance is expected accordingly. In the conference, the experimental results, the detail of modeling and numerical results will be shown and also the performance estimation will be discussed.
[1] T. Kii, et al. FEL 2006, THPPH035 (2006),
R. Kinjo, et al., FEL 2008, THAAU03 (2008)
[2] C.P. Bean, Phys. Rev. Lett. 8, 250 (1962)
[3] M. Morita, et al. NIPPON STEEL TECHNICAL REPORT No. 93 (2006)
