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A First Look at the Longitudinal Emittance in the Fermilab Recycler Ring

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Submitted by:
Ruth A. Becker
Updated by:
Monica A Neuffer
Document Created:
02 Aug 2002, 15:50
Contents Revised:
02 Aug 2002, 00:00
Metadata Revised:
02 Aug 2002, 00:00
Actually Revised:
14 Aug 2003, 23:10
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02 Aug 2002, 15:50
In this note we present the first measurement of the longitudinal beam emittance in the barrier buckets at the Fermilab Recycler Ring (RR). The results are compared with the beam emittance in the Main Injector (MI) before its injection into the RR. The data clearly indicates that there is no or little emittance growth during the beam transfer.On the other hand, a factor of six longitudinal emittance growths is found for the beam stored in barrier bucket for a long time (about 30 min) with MI ramping. The observed emittance growth cannot be explained by beamdynamics simulations, which include various rf manipulations. A few possible sources of emittance growth are discussed.
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