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Figure 4
The two nested TTL signals (top) of 3 and 1.5 kHz, respectively, establish measurement of the four possible combinations of acquiring unpumped or pumped and halo or (slicing + halo) signals. The simplified X-ray signal (at 6 kHz) consists of a tall bold black bar representing the signal from the laser sliced bunches (slicing + halo) and small blue bars representing the remaining halo radiation for the subsequent storage ring revolutions. The data acquisition (DAQ) is triggered twice three round trips (RT) before (−2400 ns), and twice simultaneously with the actual laser slicing event. The former acquisitions yield the pure unpumped and pumped halo signals while the latter provide the unpumped and pumped slicing + halo signals, respectively. The pump laser amplifier (bottom) alternatingly generates one pump pulse in two laser slicing events, corresponding to 3 kHz repetition rate but with the same timing as the DAQ.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 3| May 2016| Pages 700-711
doi:10.1107/S160057751600401X
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