Dear Matt, do I understand correctly that for entire 150 ns the readout from all SVT strips will be saved in an event? Why do you write 6*25 ns? Are they read sequentially layer-by-layer? Then for a single layer pile-up time would be 25 ns. Unfortunately I do care about beam background, since it affects the resolution (also I have no idea how much, may be it is negligible). Regards, Mikhail. On 10/03/2014 05:28 PM, Graham, Mathew Thomas wrote: > cale, the SVT readout window is 6*25ns = 150ns, with a shaping time of ~50ns (for the test run…we’ll probably crank it down to ~35ns for the full run). So, yes you need a lot of bunches around the main event if you want to realistically simulate things. As mentioned, if you don’t care about the beam background effects there is a different ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1