BLTWG Meeting 12/14/2009
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- Time: 11:00 EST
- Place: EVO and ESNET (with telephone bridge)
- Connecting: instructions are here
- Present: Richard J., Jim M., Igor S., Liping G., Alex S., Tim W., David L.
Agenda
- Understanding the Primakov beam energy resolution requirements -- discussion
- Progress finalizing results for the tagger magnet resolution -- Alex
- Status report on diamond radiator fabrication -- Richard
- Other progress reports -- others
Notes
Status of Microscope Electronics
- Control board: FPGA firmware debugging is complete!
- all functionality there. Robust against Ethernet problems (failing links, traffic etc.)
- inputs/outputs understood, but calibration of DAC may be necessary. Change of its reference voltage may be necessary to remove the systematic shifts present with the current less-than-required supply voltage.
- yield of good boards is poor for now: only one of the three prototype boards has a functional DAC. One more may be restored. It is suspected that the ball grid array DAC chip was not soldered on (reflow processed?) with the proper temperature profile. The DAC manufacturer specifies tight processing requirements and it is not clear the company populating the boards is aware. We are currently talking to them to establish where the problem lies with that procedure and make sure this is not a problem in the future.
- Backplane (control/amplifier board interface and signal feed-through)
- Layout complete
- Final details of printing being worked out (especially w.r.t. the light-sealing)
- Manual assembly (at least for the prototype) is intended to save cost - all components are through-hole.
- Amplifier board: in the process of population. Some issues of component reel format (related to the small size of batch) being worked out right now.
- Low-level software (microscope comm. protocol-aware Ethernet packet communication routines) exists. General, socket-based, Java-based layers being added that will become a proper microscope monitoring suite.
- Full system bench-top test expected by winter (subject to academic schedules).
