Minutes of meeting held on 18 Aug2020
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Nathan presented the new longitudinal damper design.
(1) The overall goal is to reduce the electrical delay.
(2) By increasing the IF from 25 KHz to half the revolution frequency
    (i) Reduces logic latency by 12x 
    (ii) The CIC notches are now at the revolution harmonics.
(3) Reduced CIC from 3 stages to 1 stage.
(4) Replaced FIR 2 tap filter with new IIR filter.
(5) Upgraded hardware to use 16 bit ADCs from 14 bit ADCs
(6) Internally, everything done is floating point, so no overflow
problems anticipated.
(7) Slide 4 shows the time domain filter response was improved from
about 160 us to about 20 us (50 us/div).
(8) The measured delay of the system is about 220 us. The new system
delay is about 60 us. This means that  above transition, sync freq is
2.5 kHz (400 us) so this system should be able to hit the beam before
it grows.
   (i) This should also improve the power requirements to stop the
   beam from blowing up.
(9) Nathan has tested the system with pure tones adn things look good.
(10) Plan is to begin beam tests with labview control, i.e Nathan will
be using his laptop and not the control system yet.
   (i) Nathan plans to ask controls to start working on the ACNET app.
   (ii) Nathan would also buy a $2.4k server for the damper. Dave says
   that PIPII can do it in FY21. In the mean time, Nathan will use a
   spare server to do development.
   (iii) Can work with $17 when beam comes back.
   (iv) This system can work with the old system in parallel because
     it can be switched in.   
   (v) Beam diagnostics will need to be written with new software to
   talk to the new front end. These diagnostics will not be there on
   day 1.
(11) Guess that it will take a month to commission. The system is
available now and is really waiting for beam.