[Halld-tracking-hw] [EXTERNAL] Re: slot for DC alignment talk

[Simon Taylor]

We should definitely be able to match straight tracks with the start counter.   How efficient this is I do not know.

Looking at the PDF Keigo curculated, the black distribution looks like it needs to be shifted to the right by about 10 ns.

Simon
________________________________
From: Sean Dobbs <sdobbs at fsu.edu>
Sent: Friday, February 7, 2020 2:09 PM
To: Keigo Mizutani <keigo at jlab.org>
Cc: Lubomir Pentchev <pentchev at jlab.org>; halld-tracking-hw <halld-tracking-hw at jlab.org>; Simon Taylor <staylor at jlab.org>
Subject: Re: [EXTERNAL] Re: [Halld-tracking-hw] slot for DC alignment talk

Hi Keigo,

Unfortunately this is not an easy question - generally I haven't been
calibrating these runs since it's not a straight-forward task with our
current codes, and the person who calibrated the 2016 data is long
gone, so I'm not 100% sure what he did.  Also, it had been my
understanding that, at least to this point, a detailed timing
alignment wasn't required.  But we can work on this.

A quick look at both runs doesn't show any obvious problems, except
for maybe the start counter, but maybe some of the assumptions that
are being made are not correct for the field-off data.

One question for Simon: is there a reason we should not expect tracks
to be matched to the start counter in the field-off data?

One more serious problem I noticed is that if you are running off of
the standard CCDB, it seems like 11048 is configured to have the
magnetic field on in the reconstruction. Presumably this would not
give correct answers. Can you confirm that you see this too (you
should be able to see if a magnetic field map is loaded by looking at
the output of hd_root), and if so, can you tell me which 2016
field-off runs you might be looking at?

Cheers,
Sean


On Fri, Feb 7, 2020 at 1:26 PM Keigo Mizutani <keigo at jlab.org> wrote:
>
> Hi Sean,
>
> I've checked two straight track runs: run040847 in 2018 and run011048 in 2016, using the same tracking code (halld_recon).
> Only run040847 shows high left-right mis-selection rate in the FDC tracking, and I'm suspecting that this might be related to the timing calibration.
>
> I'm sending one picture as an attachment.
> This figure shows drift time distributions for the two straight track runs (& one field-on run).
> The distribution for the run040847 is shifted compared to the run011048, and I'd like to know the t0 calibration status of this run040847. Is this run calibrated in the way for the run011048?
>
> Best regards,
> Keigo
>
> ________________________________
> From: Sean Dobbs <sdobbs at fsu.edu>
> Sent: Friday, February 7, 2020 11:22 AM
> To: Lubomir Pentchev <pentchev at jlab.org>
> Cc: halld-tracking-hw <halld-tracking-hw at jlab.org>; Keigo Mizutani <keigo at jlab.org>
> Subject: [EXTERNAL] Re: [Halld-tracking-hw] slot for DC alignment talk
>
> It looks like there should be room, so I added in 15 minutes for Keigo
> to talk.  Perhaps it just reduces the size of the coffee break.
>
> I don't mind answering questions regarding the timing, but the DC
> meeting overlaps with my class time this semester.  So perhaps Keigo
> can send me (or whoever else is related) an email, or we can set up a
> separate BlueJeans meeting.
>
> Cheers,
> Sean
>
>
> On Fri, Feb 7, 2020 at 11:11 AM Lubomir Pentchev <pentchev at jlab.org> wrote:
> >
> > Hi all,
> >
> > At the tracking meeting yesterday
> >
> > https://halldweb.jlab.org/wiki/index.php/Meeting-2-6-2020
> >
> > Keigo presented interesting results showing his progress with the DC alignment and at the same time he had some questions related to the timing calibration of the relevant detectors. We decided that it would be helpful to present his progress at the collaboration meeting. He needs 10-15 min, however at this moment there are no open slots for his talk.
> >
> > Can we reshuffle the talks at the detector session (there's no organizer there in the agenda) and around so that we can give him 15min?
> >
> > Thanks,
> >  Lubomir
> >
> > _______________________________________________
> > Halld-tracking-hw mailing list
> > Halld-tracking-hw at jlab.org
> > https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw
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