Differences
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daq:mode2 [2012/05/18 08:30] weisshaa created |
daq:mode2 [2012/05/18 14:49] campbell |
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| + | ====== DAQ:Mode 2 data loss (Chris) ====== | ||
| + | |||
| ====== Severity ====== | ====== Severity ====== | ||
| + | We cannot afford losing <del>any triggered</del> data //**in an uncounted manner**//. For absolute x-section measurements with GRETINA efficiency is crucial. | ||
| ====== Problem ====== | ====== Problem ====== | ||
| + | For S800-GRETINA data with GRETINA self-trigger only we find S800 events in Global.dat without corresponding GRETINA event. | ||
| - | ====== Progress ====== | + | == Size of problem (from Scott's email)== |
| + | In a low rate file, the following event counts were found: | ||
| + | | ||
| + | 11,886 coincident events (s800 and gretina present with correlated timestamp) | ||
| + | 719 s800 only events | ||
| + | 15 gretina only events (now fixed in S800 daq) | ||
| + | |||
| + | So, ~6% of the decomposed data is missing. | ||
| + | | ||
| + | Also, missing gretina data is spread throughout the file, not concentrated at the beginning or end. | ||
| + | |||
| + | ====== Progress ====== | ||
| + | * 5/17/2012: Discussed losses with Mario. Code review and version check to follow. | ||
