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[Gerard Visser <gvisser AT indiana.edu>]

Hi Zhenyu,
	Sounds quite fine. As usual be sure that the pulse width feeding to the ARC-II 
trigger input is a few hundred ns at least. Of course that should be no problem.
	It's probably easiest for you guys in general to leave the readout system 
latency set correctly for cosmics, and for laser data use another gate/delay 
generator to get a trigger pulse for the readout with a latency that matches 
your cosmics trigger. Although of course it is ok to change the latency settings 
for the APV instead.
        Are there any misbehaving ARM boards or other things that I need to 
look into?
        Sincerely,

                Gerard


On 1/21/2020 1:53 PM, Ye, Zhenyu wrote:
> Hi Gerard,
>
> > On Jan 21, 2020, at 12:00 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> >
> > hi Andres, Zhenyu,
> >         Sorry I missed the meeting yesterday. But I looked over the nice 
> > slides on the test system now at least.
> >         If there are problems or apparent problems with the readout please 
> > write me with details, I will try to help sort that out. I gather you were 
> > still to swap the ABC boards or ARM boards to see if some problem followed 
> > the one or other. The ABC boards are just connector boards; but there are 
> > fuses there which could be blown.
> >         About the laser: This is pulsed laser I presume. What is the pulse 
> > width
>
> The gain-switched operation of the semiconductor laser diode allows emission 
> of optical pulses from 45 ps to 110 ps
>
> > and rep rate,
>
>         • Continuously tunable repetition rate from pulse-on-demand to 40 MHz
>
> > and how do you trigger the readout in sync with the laser pulse?
>
> We will send a signal simultaneously to trigger the laser and to IST/FST 
> readout system. We will need to tune the latency.
>
> Zhenyu
>
> >         Sincerely,
> >
> >                 Gerard
> >
> >
> > On 1/21/2020 12:28 PM, Ye, Zhenyu wrote:
> > > Minutes:
> > ...
> > > 4. UIC Test stand - Xu/Andres
> > > Presented design for cosmic ray  and laser test stands.
> > > Requested to have a few extra parts from BNL. Flemming will check with Mike 
> > > and provide them
> >
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