JLAB Discriminators

First version was developed by James Proffitt and is used in tagger system. It was tested by Sergey Pozdnyakov. Results of tests are presented on the next few slides:

• Width distribution ( eps pdf)

• Threshold distribution ( eps pdf)

• Resolution of Leading Edge for JLab Discr. ( pdf eps)

• Resolution of Leading Edge for LeCroy 2313 Discr. (for compare) ( pdf eps)

• Resolution of Trailing Edge for JLab Discr. ( pdf eps)

Manual: pdf.

Following changes were recommended to make that board suitable for CLAS12:

• remove preamplifiers (at least reduce gain): can be done by not-installing some components; different amplifiers can be installed

• mask outputs

• add test input: directly to digital side

• individual channel thresholds

• add second output connector (or high dense connector ?): yes

• individual programmable width step: 8ns -> 4ns, the less the better

• delay ???

• 32-channel: will try

• fast enough ???

• internal delay ??? (10-20 ns is Ok)

• thermodrift ???

• remove monitor

• not-stop scaler readout possible problem ???

As on October 11, 2007 the possibility of board redesign was discussed with Volker, Chris and Stan Majewski, and we are waiting for Stan's final word.

Nov 16, 2007 James responded, asking for details. Sergey responded to Volker and James.

Apr 16, 2008: waiting for management to find money to pay James to do a job.