Overview Goal Study GEM variables in SVAC ntuple

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Presentation transcript:

Overview Goal Study GEM variables in SVAC ntuple So far in Italy we have not used the GASU Came to SLAC to learn about the GEM variables and how the trigger works Prepare for final LAT data analysis Instrument Analysis Workshop 6 (see Eduardo’s talk) Data Runs used for this talk 8 tower data (validated run by SVAC) Run 135004431 my reference for this talk 16 tower data (test run) Run 135004859 there could be problems here since it is a test run

Number of Triggered Towers Run 135004431 (8 tower data: 499893 events, 1803 s) ~78000/1803 = 43 Hz ~800/1803 = 0.44 Hz (Trigger threshold ~ 100 MeV)

Number of towers triggered Run 135004431 (8 tower data) Most of the events occur in 1 or 2 towers 1 Track Events Only TKR triggers TKR opens trigger window CAL opens trigger window

Trigger Rate (16 tower data) Run 135004859 (16 tower data, 942229 events in 1804s) ~ 80000/1800 = 44 Hz ! (as expected) Log Scale Linear Scale

Number of Triggered Towers (16 tower data) Run 135004859 1 Track Events Only TKR triggers CAL is not allowed to open the trigger window for this test run TKR opens trigger window

Summary Preliminary Look at Trigger rates for 16 towers agree with expectations Recommendation add this plot to the SVAC reports Future Plan to study GEM variables when LAT data is available will continue developing scripts using existing data