Measurement of space charge effect on transverse emittance

Sarah M Cousineau, Kaiye Fung,M Ball,C M Chu,V Derenchuk,G East,D L Friesel, Wangzhen Guo, A Harbi,S Y Lee,T Sloan, Siyi Wang,Yong Zhang, J J Holmes, S Shastry,K Y Ng

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)（2001）

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Abstract

The SNS accumulator ring is designed to compress 1.5/spl times/10/sup 14/ 1 GeV protons from a bunch train of 1000 /spl mu/s H/sup -/ to a single proton bunch with bunch length 700 ns. The injection scenario of the SNS is experimentally simulated at the Cooler Injector Synchrotron (CIS) at Indiana University. A 100 /spl mu/s, 7 MeV H/sup -/ bunch train from the RFQ and DTL is compressed into a single proton bunch with bunch length /spl les/ 150 ns. The transverse rms emittance of the 7 MeV beam is measured by the quadrupole tuning method in the CIS extraction line. Measurements are taken at various beam intensities with peak currents ranging from a few mA to hundreds of mA. Results are compared with simulation, and the effects of multiple strip foil transits and space charge are discussed.

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Key words

space charge,protons,neutrons,dtl,radio frequency,linear particle accelerator

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