Star-fst-l mailing list

[videbaek <videbaek AT bnl.gov>]

No you are not,
I just thought that the majority of these would be normal top-bottom 
cosmic that will hit the cylinder,
-certainly the initial cuts should be loose as yuo say.

-F


On 2021-11-23 08:25, Carl Gagliardi wrote:
> Hi Flemming—
>
> I hadn’t imagined the HLT filter as the final answer.  Rather, I had
> imagined that it would select the small fraction of cosmic events that
> project to the vicinity of the FST for a small data stream.  Then that
> stream can be run through Fast Offline to provide the TPC tracks,
> followed by detailed FST-specific studies – multiplicities, timing,
> amplitudes, hit correlations, etc.
>
> Am I completely out to lunch?
>
> Carl
>
> From: videbaek <videbaek AT bnl.gov>
> Sent: Tuesday, November 23, 2021 6:34 AM
> To: Hongwei Ke <kehw AT rcf.rhic.bnl.gov>
> Cc: Xu Sun <sunxuhit AT gmail.com>; Star-fst L
> <star-fst-l AT lists.bnl.gov>; Carl Gagliardi <c-gagliardi AT tamu.edu>;
> Aschenauer Elke-Caroline <elke AT bnl.gov>
> Subject: Re: [Star-fst-l] FST Position
>
> Hi Hongwei, Thanks for implementing this. I think we could consider
> strengthening th criteria. This woud allow any track that hits th
> cycinder to be tagged. One suggestion would be to require one of two
> conditions a) cylinder hit AND hit in ZjQcmQRYFpfptBannerStart
>
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>
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>
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>
> Hi Hongwei,
>
> Thanks for implementing this.
>
> I think we could consider strengthening th criteria. This woud allow
> any
>
> track that hits th cycinder to be tagged. One suggestion would be to
>
> require
>
> one of two conditions a) cylinder hit AND hit in second disk (182) or
> b)
>
> hit in disk 1 (148) and hit in disk(2). This would match the criteria
>
> for the two trigger evpw/e and ewpdw.tof , and give higher probability
>
>
> for also hits in stgc.
>
> Of course the reduction is still large w/o this extra criteria.
>
> F
>
> On 2021-11-22 23:15, Hongwei Ke wrote:
>
> > Hi Fleming and all
>
> >
>
> > Thank you for the info. Here is what I have implemented and ready
> for
>
> > test.
>
> >
>
> >           * I use bField = 1e-6 Tesla instead of zero to make sure
> all
>
> > extrapolation functions work properly. This value is chosen
>
> > arbitrarily. As long as it is not zero, the math should be correct.
>
> >           * To "match FST", I extrapolate TPC tracks to three
> surfaces.
>
> >
>
> >           * A cylinder: r = 36cm, 148 <= z <= 182cm  # cylinder
> geometry is
>
> > easier to deal with
>
> >           * A disk r <= 36, z = 148
>
> >           * A disk r <= 36, z = 182
>
> >           * These values can be changed easily. If needed, they can
> be
>
> > implemented as Run Control parameters that can be turned by shift
> crew
>
> > run-by-run.
>
> >
>
> >           * The track extrapolation is done in sequence. If there is
> one track
>
> > hits any of those three surfaces, it is a match and the event will
> be
>
> > tagged.
>
> >           * From my standalone test on a signal daq file from run
> 22326045,
>
> > 748 out of 30374 events are tagged. The ratio is ~2.5%.
>
> >
>
> > Best regards,
>
> > Hongwei Ke
>
> >
>
> > > On Nov 22, 2021, at 4:05 PM, videbaek <videbaek AT bnl.gov> wrote:
>
> > >
>
> > > Hi Hongwei,
>
> > > cc Xu
>
> > >
>
> > > With the actual positions  the z range should rather be 148 to 182,
>
> > > As Xu says you can ether use a square for the xy cut or maybe
> better
>
> > > a circle with radius say 36(40)
>
> > >
>
> > > F.
>
> > >
>
> > > On 2021-11-22 15:59, Xu Sun wrote:
>
> > > Hi Hongwei,
>
> > > The radius of the FST disk is about 31cm, therefore, I quote 40cm
>
> > > for
>
> > > both x and y.
>
> > > Not sure why Carl quotes y = 0, maybe Carl could comment.
>
> > > Best,
>
> > > Xu
>
> > > On Mon, Nov 22, 2021 at 3:57 PM Hongwei Ke <kehw AT rcf.rhic.bnl.gov>
>
> > > wrote:
>
> > > Hi Xu,
>
> > > Carl’s number in his Nov 20 email to star-ops are a little
>
> > > different.
>
> > > Would it be possible for L4 to identify those events with a cosmic
>
> > > track that projects through the rectangle:
>
> > > -40 < x < +40
>
> > > 140 < z < 180
>
> > > At y=0
>
> > > Which one should I use?
>
> > > Best regards,
>
> > > Hongwei Ke
>
> > > On Nov 22, 2021, at 12:28 PM, Xu Sun <sunxuhit AT gmail.com> wrote:
>
> > > Hi Hongwei,
>
> > > As discussed in today's 10 clock meeting, please find the FST
>
> > > position below:
>
> > > x & y: -40 to 40 cm
>
> > > z: 140 to 180 cm.
>
> > > Hope this helps.
>
> > > Best,
>
> > > Xu
>
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>
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> >
>
> > --
>
> > Flemming Videbaek
>
> > senior scientist
>
> > videbaek @ bnl.gov [1]
>
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>
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>
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>
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> --
>
> Flemming Videbaek
>
> senior scientist
>
> videbaek @ bnl.gov
>
> Brookhaven National Lab
>
> Physics Department
>
> Bldg 510D
>
> Upton, NY 11973
>
> phone: 631-344-4106
>
> cell     :  631-681-1596
>
>
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596