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An experiment investigating the photoelectron instability has been performed in BEPC at IHEP, China. The betatron oscillation of each bunch was observed and recorded by a single pass beam position monitor system which has a capability to measure the transverse position of every bunch over 16000 turns. The effect of an octupole magnet on the instability was(More)
Android robots that have a human-like appearance have been developed recently. The purpose of android robots is to realize realistic communication between human and robot by implementation of human-like behaviors. Then knowledge and techniques for generating human-like natural motions and behaviors with android robot are required. In face-to-face(More)
The purpose of this study is to develop the interactive communication system that communicate with human beings emotionally such as a human-friendly robot in an environment where human and robot coexist. The face and its expressions are crucial for communication, so we have been developing a face robot using McKibben type pneumatic actuator to display(More)
For the stable high-luminosity operation and luminosity-increase, the electron and positron storage rings of the KEK B-Factory (KEKB) is equipped with various beam instrumentations, which have being working well since the start of the commissioning in December, 1998. Details and performance of the beam-position monitor system based on the spectrum analysis(More)
In order to investigate the single-beam vertical beam-size blow-up observed[1] in the KEKB 3.5 GeV positron ring (LER), we performed beam-size observations using a high-speed gated camera capable of recording the image of a single bunch in the ring. Using this technique, we measured the beam-size dependence on bunch position along a train, and studied the(More)
Transverse bunch-by-bunch feedback systems for damping coupled-bunch instabilities in the KEKB rings have been working since the early stage of the commissioning of the rings. Stabilization of the beams with the system have been successful, permitting tests of higher beam currents and various filling patterns. The performance of these systems has been(More)
Crab cavities have been installed in the KEKB B– Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been done since February 2007. (IP). Although there are a lot of merits in the crossing angle scheme, the beam-beam performance may degrade. The design of KEKB(More)
Crab cavities have been installed in the KEKB B– Factory rings to compensate the crossing angle at the collision point and thus increase luminosity. The beam operation with crab crossing has been done since February 2007. This is the first experience with such cavities in colliders or storage rings. The crab cavities have been working without serious(More)