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Figure 18
Measured time spectrum of noise in top-up operation with 203 bunch mode. The data were measured using an avalanche photodiode at BL09XU on 3 July 2004. The total counts from the 203 bunches in this measurement period were 8 × 1010 and the averaged impurity can be estimated by normalizing the measured counts by 8 × 1010. The reference of the horizontal axis (relative time) is the middle of each single bunch. The separation of the RF buckets is 2 ns and each dashed vertical line represents the centre of the corresponding RF bucket in relative time.

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