Abstract
An orbit feedback system around the interaction point (IP) has been developed and successfully employed at KEKB for more than 6 years. The purpose of the system is to maintain an optimum geometrical relationship of orbits of two beams at the IP and to prevent a luminosity degradation due to orbit drifts. The feedback system is based on orbit measurements around the IP rather than a direct measurement of the luminosity. Owing to the system, the luminosity degradation due to the orbit drifts is suppressed to around or less than 1%.
Highlights
The KEKB B-factory is a second generation electronpositron collider
To make the physical meaning of this parameter clear, let us consider a simplified situation where the four beam position monitors (BPMs) are located an equal distance from the interaction point (IP) (LBPM) and there are no optical devices between the BPMs and the IP
The orbit feedback system is successfully employed at KEKB for minimizing the luminosity degradation due to the vertical orbit drifts
Summary
The KEKB B-factory is a second generation electronpositron collider. It has two significant features of a very high luminosity and an energy asymmetry. The requirement of energy asymmetry inevitably leads us to the scheme of a double-ring collider. From the standpoint of machine design, this double-ring scheme enables a high currentmultibunch approach like synchrotron light sources, which is vital to reach a higher luminosity. In addition to these features, KEKB adopted a challenging scheme of a horizontal crossing angle of 11 mrad. A motivation of the crossing angle is to simplify the IR (interaction region) design and to suppress effects of parasitic crossings [1]
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