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TPC Hits not being produced in MOKKA [message #1591] Thu, 16 October 2008 02:26 Go to previous message
Messages: 18
Registered: October 2008
Location: Bristol/RAL

I have been using MOKKA's particle gun to generate single electron events, however if I set the gun direction to 1. 0. 0. I don't get any hits in the TPC. The particle gun has an offset of 0.02 in z, this is to avoid missing hits in the vertex detector, where the two sensors meet. If I increase this offset to 5 I start to get hits in the TPC. I have also smeared the angle phi and the problem still exists, so its not one particular angle. I have also increased theta by 10 degrees, which then produces hits in the TPC. Does anyone know if such a gap should exist in the TPC or if there is another reason for this behavior? Any help would be greatly appreciated.

Thank you

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