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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

Hi Gerard,

> On Jan 21, 2020, at 12:58 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> 
> 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.

Thanks for the tip. We will look into these options to see which one works 
easiest for us. 

>       Are there any misbehaving ARM boards or other things that I need to 
> look into?

I shall let Xu to comment on this.

Zhenyu

>       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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