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Published January 1998 | Published
Journal Article Open

Observation of the dynamic beta effect at the Cornell Electron-Positron Storage Ring with the CLEO detector


Using the silicon strip detector of the CLEO experiment operating at the Cornell Electron-Positron Storage Ring (CESR), we have observed that the horizontal size of the luminous region decreases in the presence of the beam-beam interaction from what is expected without the beam-beam interaction. The dependence on the bunch current agrees with the prediction of the dynamic beta effect. This is the first direct observation of the effect.

Additional Information

© 1998 The American Physical Society. Received 30 June 1997; revised manuscript received 3 September 1997. J.P.A. thanks the NYI program of the NSF, M.S. thanks the PFF program of the NSF, M.S., H.N.N., and H.Y. thank the OJI program of DOE, M.S. and V.S. thank the A. P. Sloan Foundation, and M.S. thanks Research Corporation for support. This work was supported by the National Science Foundation, the U.S. Department of Energy, and the Natural Sciences and Engineering Research Council of Canada.

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