| Paper |
Title |
Page |
| MOPB082 |
NSLS2 Fill Pattern Monitor and Control |
246 |
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- W.X. Cheng, B. Bacha, Y. Hu, O. Singh, G.M. Wang
BNL, Upton, Long Island, New York, USA
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NSLS2 storage ring has harmonic number of 1320. Possible fill patterns include multi bunch train(s) followed by ion cleaning gap(s), hybrid fill with single bunch in the ion gap. Storage ring filling pattern can be measured using button BPM sum signal together with high speed digitizer or oscilloscope. Button BPM sum signal typically has dynamic range of 10-2 to 10-3. Nonlinearity of BPM sum signal dependence on beam position has been characterized. In preparation for high dynamic single bunch current measurement, a filling pattern monitor system using synchrotron radiation is under development. Besides, the storage ring filling pattern can be controlled using the bunch cleaning function integrated in the bunch-by-bunch feedback system. Results of these two filling pattern monitors and bunch cleaning will be presented.
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| MOPB083 |
Longitudinal Bunch Profile Measurement at NSLS2 Storage Ring |
251 |
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- W.X. Cheng, B. Bacha, A. Blednykh, Y. Li, O. Singh
BNL, Upton, Long Island, New York, USA
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Longitudinal bunch profile has been measured at NSLS2 storage ring using streak camera. From the measured profile, bunch lengthening and synchronous phase information can be derived to study the single bunch collective effect. Single bunch lengthening effect has been measured for bare lattice and for other lattices with different insertion devices. The streak camera can also be setup for other beam physics studies, for example to measure the injection beam dynamics and fast ion effects. Y-z imaging was measured using cylindrical lenses. Single bunch y-z profile was measured at threshold current.
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