Abstract
Electron cloud instabilities in the Los Alamos ProtonStorage Ring (PSR) and those foreseen forthe Oak Ridge SpallationNeutron Source (SNS) are examined theoretically, numerically, andexperimentally.
Highlights
Very fast transverse instabilities have been observed in the Los Alamos Proton Storage Ring (PSR) [1,2,3] and, for coasting beams, in the AGS Booster [4]
A transverse, bunched beam instability has been seen in the PSR
Electron cloud driven instabilities were observed in the ISR [5,6] and are known or suspected in several positron rings
Summary
Very fast transverse instabilities have been observed in the Los Alamos Proton Storage Ring (PSR) [1,2,3] and, for coasting beams, in the AGS Booster [4]. Using the Booster data and the cold, coasting beam approximation for the instability growth rate, a transverse resistance of order 10 M=m between 70 and 120 MHz is required to explain the observations. This is a large number for a ring with 200 m circumference and 6 cm pipe radius. Electron cloud driven instabilities were observed in the ISR [5,6] and are known or suspected in several positron rings These include the KEK photon factory [7], CESR [8], KEKB [9,10], and PEP-II [11].
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