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Tengen Murakami 1,*, Yasutaka Imai 1, Shuichi Nagata 1, Manabu Takao 2 and Toshiaki Setoguchi 1 1 Institute of Ocean Energy, Saga University, 1, Honjo, 840-8502 Saga, Japan; imaiy@cc.saga-u.ac.jp (Y.I.); nagata@ioes.saga-u.ac.jp (S.N.); setoguci@me.saga-u.ac.jp (T.S.) 2 Department of Mechanical Engineering, Matsue National College of Technology, 14-4,(More)
Stability of electron orbit is one of the most important properties to achieve brilliant photon beams for third generation synchrotron radiation sources. In the design of a SPring-8 storage ring, many ideas for orbit stabilization were thus considered. Consequently, without any correction, electron orbit stability of about 50 μm per day is obtained. Since a(More)
We have succeeded in providing stable and three-times more brilliant x-ray beams to users by combining top-up operation with low-emittance optics. The optics with the low emittance of 3nmrad was firstly applied to the user operation in November 2002. Although the low emittance provided the brilliant x-ray, the extremely short beam lifetime much disturbed(More)
The SPring-8 upgrade plan aims at significant improvement of the light source performance by replacing the existing storage ring with a completely new one. The ultimate goal is to achieve extremely small emittance that is equivalent to the diffraction limit of light in the X-ray regime. For the challenging goal, the new ring features a multi-bend lattice(More)
More than ten of in-vacuum type insertion devices are installed in the SPring-8 storage ring. When their gap was closed, we observed the low frequency vertical coupled bunch instability. We consider that this instability is driven by resistive-wall impedance caused by the magnet blocks made of NdFeB, of which conductivity is two order lower than Aluminum.(More)
The chromaticity control is very important ingredient in the operation of a high energy ring accelerator. The strong nonlinear magnetic field is then necessary to correct the large chromaticity, which inevitably enhances the nonlinearity of the beam dynamics of the circular accelerator. Hence, for the purpose of precisely controlling the chromaticity, one(More)
As a system using a conventional unidirectional air turbine in oscillating water column (OWC) based on a wave energy plant, a twin unidirectional impulse turbine topology has been suggested in previous studies. However, the average efficiency of the suggested twin turbine is considerably lower than that of a conventional unidirectional turbine in this(More)