Paper |
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TUPP028 |
Bunch Length and Impedance Measurements at SPEAR3
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1595 |
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- W. J. Corbett, W. X. Cheng, A. S. Fisher, X. Huang
SLAC, Menlo Park, California
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A series of bunch length measurements have been made for different lattice configurations in SPEAR3 as a function of single-bunch current. The lattices include achromatic optics, low-emittance optics and short-bunch, low-momentum compaction optics (low-alpha). The streak-camera data clearly demonstrates effects of both resistive and reactive chamber impedance and shows levels of microwave instability threshold. In the low-alpha mode, signs of bunch length bursting were observed. Fitted bunch-profile data, impedance calculations and bursting data are presented.
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