Star-fst-l mailing list

[Tonko Ljubicic <tonko AT bnl.gov>]

Yes, before today adc vs non-adc was "private" for FST in the sense that
the DAQ system didn't know. Which is why you saw ADC events everywhere.
>From now on that shouldn't be the case anymore and you only see them
in the adc stream.

ADC data is _always_ accompanied with ZS data regardless in which stream
it lies.




On Sun, Dec 19, 2021 at 7:49 PM Xu Sun <sunxuhit AT gmail.com> wrote:
>
> Hi Tonko,
>
> Just for my own education, I was able to get some non-zs events from the 
> "non-adc" stream in the past runs.
> And that will not be the case anymore?
>
> For the "adc" stream, if I understand correctly, both zs and non-zs will be 
> saved from that event in the "adc" stream.
> Is that correct?
>
> Best,
>
> Xu
>
> On Sun, Dec 19, 2021 at 1:42 PM Tonko Ljubicic <tonko AT bnl.gov> wrote:
>>
>> Hi Xu, all,
>>
>> this is done -- from now on FST will use the STAR system default of ~1/100.
>> Note that the events with the ADC will be in the "adc" stream, as per 
>> Jeff's
>> setup (or so I hope).
>>
>>          -- Tonko
>>
>> On Sun, Dec 19, 2021 at 7:26 PM Xu Sun <sunxuhit AT gmail.com> wrote:
>> >
>> > Hi Tonko,
>> >
>> > As discussed in today's meeting, I am done with the ADC timing 
>> > adjustment and we should be good to set the ratio to 1:100.
>> >
>> > Best,
>> >
>> > Xu
>> >
>> > On Sun, Dec 19, 2021 at 4:14 AM Tonko Ljubicic <tonko AT bnl.gov> wrote:
>> >>
>> >> Hello,
>> >>
>> >> I had a few private emails with Xu so we left it at 1:5 for yesterday
>> >> but right now we are again dominated by FSTs data volume
>> >> (deadtime 35% at 1300 Hz) so I will cut it down to 1:20
>> >> and then to 1:100 e.g. tomorrow.
>> >>
>> >> IMHO, we should set the steps still needed before we switch to
>> >> 4 timebin readout.
>> >>
>> >>            -- Tonko
>> >>
>> >>
>> >>
>> >> On Fri, Dec 17, 2021 at 9:12 PM Xu Sun <sunxuhit AT gmail.com> wrote:
>> >> >
>> >> > Hi Tonko, All,
>> >> >
>> >> > We should have enough non-zs data, switching back to 1 to 100 should 
>> >> > be fine for us.
>> >> >
>> >> > Best,
>> >> >
>> >> > Xu
>> >> >
>> >> > On Fri, Dec 17, 2021 at 9:29 AM Visser, Gerard <gvisser AT indiana.edu> 
>> >> > wrote:
>> >> >>
>> >> >> I see no reason to have so much non-ZS. If a test run needs more 
>> >> >> e.g. to check the ADC timing, it can be changed for one run and then 
>> >> >> put back. But this even is probably not necessary.
>> >> >>
>> >> >>       Gerard
>> >> >>
>> >> >> ________________________________
>> >> >> From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of 
>> >> >> Aschenauer Elke-Caroline <elke AT bnl.gov>
>> >> >> Sent: Friday, December 17, 2021 9:25 AM
>> >> >> To: Tonko Ljubicic <tonko AT bnl.gov>
>> >> >> Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
>> >> >> Subject: Re: [Star-fst-l] FST deadtime and raw events in the data 
>> >> >> stream
>> >> >>
>> >> >> As we are planning to get up in lumi, we need to change this, so the 
>> >> >> FST group should think what they need and why
>> >> >>
>> >> >> Cheers elke
>> >> >>
>> >> >> On Dec 17, 2021, at 09:15, Tonko Ljubicic <tonko AT bnl.gov> wrote:
>> >> >>
>> >> >> Hello,
>> >> >>
>> >> >> from the runs last night you can notice that FST
>> >> >> runs at 1.2 kHz with ~40% deadtime.
>> >> >>
>> >> >> This is currently all due to the large number of non-zero-suppressed,
>> >> >> raw, events, currently 1 in 5.
>> >> >>
>> >> >> If we plan to at least approximate the TPC (and we plan more
>> >> >> eventually) right now I propose we drop this enhanced
>> >> >> raw data percentage to 1 in 20 or even to the usual 1 in ~100.
>> >> >> I can't imagine why you would need so many of them but
>> >> >> it's not my call.
>> >> >>
>> >> >> Let me know what you think,
>> >> >>
>> >> >>       -- Tonko
>> >> >> _______________________________________________
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