Minutes of the forward endcap EMC SeeVogh meeting, 1st of February 2016, 14:00-15:00

Presence:

• Basel: Werner
• Bochum: Fritz-Herbert, Malte, Matthias, Tom
• Bonn: Christoph, Ulrike
• Groningen: Myroslav
• Stockholm: Karoly, Markus
• Uppsala: -
• GSI: -

'Bonn' VPTT subunit:

• The VPTT subunit for the Bonn colleagues is finished and tested
• Transport is arranged for Thursday noon this week by Werner Meyer
• Weiberfastnacht may delay delivery to HISKP by one day (to be checked with Werner Meyer)

Basel preamp modification:

• Werner achieved a major improvement concerning preamp stability by adding a capacitor between the inputs of the operational amplifier in the preamp circuit
• Preamp susceptibility to oscillation at low temperaturesis reduced, ringing (with oscillation frequency) in rising edge of output signal is removed
• Four test pieces have been sent to Bochum (arrived on February, 2nd)
• Test pieces equipped with 2.7 pF gain determining capacitors, resulting in lower preamp gain than expected to be neccessary for stability, allowing us to operate APDs at high gain (~200) as originally intended (need to check/estimate this prior to order preamps for new APD subunit)

Read out:

• Myroslav visited Giessen again: There are four TRBs bought by the Dueren group that will presumably not be used before summer - probably we can borrow one
• If so, Myroslav will come to Bochum to set up the system

Stockholm group:

• Markus Preston introduced himself and the work going on in Stockholm:
• There is an ADC board w/ Virtex 6 FPGA and full analog shaping (high pass, low pass) and a TRB board from KVI in order to test feature extraction on the FPGA
• There are two LaBr crystals mocking up 'cold' PWO pulses (how precise is the similarity in risetime?)

Bochum:

• Almost all Swagelok hoses for cooling connection arrived
• KVI production of distributor 'bones' may be possible