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Fiber Planes
Active detector is Kuraray scintillating fiber (blue) Fiber planes are doublet structure like fiber tracker
Commissioning Status
The Electronic Noise that was seen has now been completely removed Cable shielding
Both BPMs have been calibrated to some extent with a 60Co source However the activity was so low that we had
some difficulty Final calibration with beam was,
unfortunately, not done due to the Target failure in December
We did get some beam data with the small BPM, however
Beam Data in Small BPM
Beam data from November run
Dip if Y profile we believe is now fixed after we did the threshold scan/set using the 60Co source
Once we have beam again, we will continue the calibration (both threshold and PMT HV)
We have also asked for a stronger (100X) 60Co source
Conclusions
Both the small and the large BPM are working well No dead channels Electronic noise rate is ZERO PMT noise is low - <<1 hit/channel
The small BPM has taken beam data At that time there was a dip in the response in the Y
view We believe that this is now fixed by adjusting thresholds
The large BPM has been calibrated with the 1 C 60Co source
It has not seen beam yet Look forward to doing final calibration with beam in
May? Will also do addition calibrations with 60Co, if we can get
a 100 C source