CDC prototype runs at CMU

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The prototype runs at CMU were made with the prototype sitting along the top of one scintillator. The scintillator is only slightly larger than the prototype.
Run 2016 at JLab was a cosmics run with the BCAL trigger.
The CDC run at CMU used two scintillators in coincidence, the scintillators were above and below the CDC, separated by approx 2m, and are 9" wide. The cosmic rays would have been much closer to vertical than for the prototype and JLab measurements.

First article/prototype preamp & HVB were used for all but one of the prototype runs. One run was made using JLab preamp & HVB with all other settings unaltered since the previous run; as expected, the resulting data look very similar.


Prototype, 2100V, 50/50 Ar/CO2
max amp
drift time
Prototype, 2100V, 55/45 Ar/CO2
max amp
drift time
Prototype, 2100V, 55/45 Ar/CO2 JLab electronics
max amp
drift time
Prototype, 2100V, 60/40 Ar/CO2
max amp
drift time
CDC straw 496 2100V JLab run 2016 (cosmics, BCAL trigger)
max amp
drift time
CDC (sum) 2100V JLab run 2016 (cosmics, BCAL trigger)
max amp
drift time
CDC (72ch) at CMU, 2100V, 50/50 Ar/CO2 with large scint paddles along the length of the CDC
max amp
drift time w terrible fit


CDC at CMU had MPV at ~190 for 2110V, 50/50 Ar/CO2. CDC wire is 20um, prototype wire is 18um (7 mil), and prototype straw radius is also slightly different.


THIS TURNED OUT TO BE COMPLETE GARBAGE - accidentally used JLab window settings - note extra time bump
max amp
drift time