Star-fst-l mailing list

[videbaek <videbaek AT bnl.gov>]

hi Xu

 I suggest we discuss this at tomorrows FST meting, and present the 
forward going plan at the 10 o'cock meeting.
 Definitely go to 4 tb and evaluate when looking at the data in detail 
if all is aligned well enough

-F

On 2021-12-19 13:32, Visser, Gerard wrote:
> hi Xu,
>      What do you think about 4 timebins? Are you guys planning to
> study different ways of using the 9 timebin data, e.g. comparing
> tracking resolution somehow using / not using data from more than the
> middle 4 timebins? By the way, how do we use the data now in the
> baseline plan? Is there a fit to the peak of the pulse, or a sum over
> an interval, or we just use a single timebin, or what?
>     If there's no real study planned with the extra 5 timebins
> pre/post of the middle 4, then we should change to 4 tb and change
> latency of course to get those middle 4. Or maybe even go to 3 tb?
>
>      Gerard
>
> -------------------------
>
> From: Xu Sun <sunxuhit AT gmail.com>
> Sent: Sunday, December 19, 2021 1:26 PM
> To: Tonko Ljubicic <tonko AT bnl.gov>
> Cc: Visser, Gerard <gvisser AT indiana.edu>; Aschenauer Elke-Caroline
> <elke AT bnl.gov>; Star-fst L <star-fst-l AT lists.bnl.gov>
> Subject: Re: [Star-fst-l] FST deadtime and raw events in the data
> stream
>
> 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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Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
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