Difference between revisions of "BCal Beam Test Plots, April 4, 2007"

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This page describes a study of the timing resolution for the BCAL beam test using run 2440. There was an issue with the data in the DST trees in  which it appears the reference time subtracted from the BCAL TDC values was different than that used for the veto TDC values. The evidence for this is that the veto/tagger timing difference(obtained from tveto+tphoton (don't ask)) shows no dependence on T-counter. On the other hand, the BCAL/tagger timing difference shows a clear dependence on the T-counters.
  
  
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[[Image:bcal_timewalk_n7_2007_04_03.gif]]
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[[Image:bcal_timewalk_n8_2007_04_03.gif]]
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[[Image:bcal_timewalk_s7_2007_04_03.gif]]
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[[Image:bcal_timewalk_s8_2007_04_03.gif]]
  
 
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[[Image:Bcal_time_res_vs_Ephoton_2007_04_04.gif]]
[[bcal_timewalk_n7_2007_04_03.gif]]
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[[bcal_timewalk_n8_2007_04_03.gif]]
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[[bcal_timewalk_s7_2007_04_03.gif]]
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[[bcal_timewalk_s8_2007_04_03.gif]]
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[[bcal_timewalk_n7_2007_04_03.gif]]
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Revision as of 16:44, 4 April 2007

This page describes a study of the timing resolution for the BCAL beam test using run 2440. There was an issue with the data in the DST trees in which it appears the reference time subtracted from the BCAL TDC values was different than that used for the veto TDC values. The evidence for this is that the veto/tagger timing difference(obtained from tveto+tphoton (don't ask)) shows no dependence on T-counter. On the other hand, the BCAL/tagger timing difference shows a clear dependence on the T-counters.


Bcal timewalk n7 2007 04 03.gif Bcal timewalk n8 2007 04 03.gif Bcal timewalk s7 2007 04 03.gif Bcal timewalk s8 2007 04 03.gif

Bcal time res vs Ephoton 2007 04 04.gif