NDLI: Multiple Bunch Longitudinal Dynamics Measurements at the Cornell Electron-Positron Storage Ring ∗

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Multiple Bunch Longitudinal Dynamics Measurements at the Cornell Electron-Positron Storage Ring ∗

Content Provider	CiteSeerX
Author	Hartill, D. Billing, M.
Abstract	The Cornell Electron-Positron Storage Ring (CESR) has a longitudinal dipole-coupled-bunch instability that limits the total amount of current that can be stored in the ring without feedback. As a result, it is one of the major limitations for higher stored current and luminosity. This paper reports the measurements of multiple bunch longitudinal dynamics done on CESR with a streak camera. The camera was used to measure the dependence of the bunch distribution on current and accelerating RF voltage, for multiple bunches stored in CESR, as well as the effects of the longitudinal instability on the bunch distribution. Measurements of the beam’s longitudinal bunch distribution with multiple bunches present in the ring, help give an understanding of the instability, how it affects the bunch distribution, and possibly give insight into a cure of the instability. 1. Multiple Bunch Operations at CESR Multiple bunches refers to more than one bunch of electrons or positrons being present in CESR at one time. Multiple bunches in CESR are necessary to achieve high luminosity. Under present high energy physics colliding beam conditions, there are up to nine nearly evenly spaced trains of bunches, with up to five bunches in each train, for a maximum of 45 electron and 45 positron bunches. The bunches are separated at crossing points, other than the interaction point, by vertical and horizontal
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Access Restriction	Open
Subject Keyword	Interaction Point Spaced Train Longitudinal Bunch Distribution Multiple Bunch Present Major Limitation Rf Voltage Positron Bunch Longitudinal Dipole-coupled-bunch Instability High Luminosity Bunch Distribution Multiple Bunch Operation Multiple Bunch Beam Condition Present High Energy Physic Cornell Electron-positron Storage Ring Multiple Bunch Longitudinal Dynamic Measurement Longitudinal Instability Streak Camera Total Amount Cesr Multiple Multiple Bunch Longitudinal Dynamic
Content Type	Text
Resource Type	Article

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