منابع مشابه
KEKB Beam Instrumentation Systems
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 using DSPs, the turn by turn BPM with ...
متن کاملPerformance of Kekb
The skew-sextupole magnets contributed to the luminosity improvement at KEKB. The luminosity gain by the crab cavities was measured as about 20% with the skew-sextupole magnets. The peak luminosity surpassed 2 × 10cms which is twice as high as the design value. The specific luminosity and the vertical beambeam parameter are still much lower than the predictions by the beam-beam simulation with ...
متن کاملImpedance Measurements in the Kekb
In the KEKB storage rings, we have measured the current dependence of the betatron tunes and the damping rate to evaluate the broad-band transverse impedance. The measured impedances were cross-checked and exceeded the design value by a factor of more than five. The tranverse mode-coupling instability was observed in LER when chromaticity was reduced. We found that the main impedance source for...
متن کاملAre Degree Achievements Really Achievements?
This paper, which builds of the work of Hay, Kennedy, and Levin (1999), examines the puzzling aspectual behavior of so-called degree achievements. Drawing evidence from Mandarin Chinese, I argue that degree achievements without difference values denote punctual events, i.e., they are true achievements. I present an analysis that is consistent with facts from both English and Mandarin; to explai...
متن کاملCommissioning Status of the Kekb Linac
After entering into the full-commissioning phase of the KEKB linac in May, 1998, we have established two linac injection modes for the KEKB ring: an 8-GeV electron beam and a 3.5-GeV positron beam, as well as beam modes for the rings of the synchrotron light sources. All modes are easily switched for almost one minute without any trouble. The linac beam characteristics have been substantially i...
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ژورنال
عنوان ژورنال: Progress of Theoretical and Experimental Physics
سال: 2013
ISSN: 2050-3911
DOI: 10.1093/ptep/pts102