138747704
Status of the MIR FEL Facility in Kyoto University
A mid-infrared free electron laser (MIR-FEL) facility (KU-FEL: Kyoto University Free Electron Laser) has been constructed for developing energy materials in Institute of Advanced Energy (IAE), Kyoto University. FEL gain saturation at 13.2 μm has been achieved for the first time in May 2008. A beam loading compensation method with feedforward RF phase control has been developed to supply the required quality of electron beam. The FEL beam characterization has been performed. The macro pulse energy of 5 mJ/pulse and the peak power of about 3 MW has been measured. The FEL transport system of wavelength range from 5 to 20 μm has been constructed to the application room. Applications of the MIR-FEL in the renewable energy research at Kyoto University will be started within this financial year.
54014117
END FIELD TERMINATION FOR BULK HTSC STAGGERED ARRAY UNDULATOR
Aiming at realizing a short period undulator with strong magnetic field, we have proposed a Bulk HTSC (High Temperature SuperConductor) Staggered Array Undulator which consists of Bulk HTSC magnets with a staggered array configuration [1]. The experiment with the prototype undulator at 77 K shows this configuration can be applicable to real device [2, 3]. We also estimated the magnetic performance of real devices by calculations with a loop current model based on Bean model of type II superconductor [4]. In these experiments, the magnetic field in the ends of the prototype were larger than the field in the center area. End field termination is required for practical use. To suppress the larger magnetic field for end field termination, we performed the calculations and the prototype experiments with the large end gap method. We concluded that the method is effective for Bulk HTSC Staggered Array Undulator.
8188983
Euclidean wormhole solutions of Einstein-Yang-Mills theory in diverse dimensions.
We solve the Euclidean Einstein equations with non-Abelian gauge fields of sufficiently large symmetry in various dimensions. In higher-dimensional spaces, we find the solutions which are similar to so-called scalar wormholes. In four-dimensional space-time, we find singular wormhole solutions with infinite Euclidean action. Wormhole solutions in the three-dimensional Einstein-Yang-Mills theory with a Chern-Simons term are also constructed.