Hi, Vitaliy, Pete, and all timing-concerned folks!
I have been carefully looking into the TOF timing issues raised by
Vitaliy and I have good news.
For the last 500 runs or so, the TOF TDCs have been as stable as they can
be. I am attaching a sample of the left top TDCs (all others are similar)
as a function of run number, for the runs 5170 (taken in February) through
5659 (taken yesterday).
You can see the run dependence is as flat as Kansas :-) (except for the
two broken fiber optics)... As I said before, since the TOF window was
modified on February 20th, the timing is not as it used to be (see
Karen's elog message from February 24th), but everything was back to
normal from run 5170 on... probably that modification threw you guys off.
Anyway, Vitaliy - I hope this gives you peace of mind. :-)
Have fun!
Adrian
On Mon, 15 Mar 2004, Peter Karpius wrote:
>
>
> Good work Adrian, you are saving me!
>
> Thanks,
> Pete
>
> On Mon, 15 Mar 2004, Adrian T Sindile wrote:
>
> > Hi, guys!
> > Preliminary conclusions (and preliminary good news): only between aprox.
> > runs 4940 (when the TOF window was adjusted on February 20th) and 5170 was
> > timing messed up (nothing to do with the TOFs, though, it was meant to
> > clean up accidentals by people then). It looks like it was fixed after
> > that, up to run 5350 I did not see anything wrong (except some broken
> > fibers).
> >
> > I will let you know if I see other periods with problems.
> >
> > Adrian
> >
> > PS: Pete, of course you will see a time shift, compared to periods before
> > run 4940... (see Karen's elog message from 02/24/2004). For me, bad timing
> > is only when the flasher TDC keeps jumping from one run to the next...
> >
> > -------------------------------
> > Adrian Sindile
> > Research Assistant
> > Nuclear Physics Group
> > University of New Hampshire
> > phone: (603)862-1691
> > FAX: (603)862-2998
> > email: asindile@alberti.unh.edu
> > http://einstein.unh.edu/~adrian/
> >
> >
> > On Mon, 15 Mar 2004, vitaliy ziskin wrote:
> >
> > > This is what I saw also and asked you to check. This is worrysome,
> > > since we rely heavily on stable timing. Can we do these checks daily?
> > >
> > > Vitaliy
> > > Peter Karpius wrote:
> > >
> > > >With Adrian's database record of timing vs. run number I have modified
> > > >the raw tof tdc macro to plot flasher tdc and print an error message
> > > >"CHECK TIMING" if the flasher peak is more than 40 channels (2ns) off of
> > > >the mark (ch=1000). 2ns is the resolution of our programmable delays.
> > > >See attached gif. This macro runs from raw data. It is:
> > > >
> > > >/home/daq/blast/pro2004/analysis/macros/Raw/raw_checktiming.C
> > > >
> > > > After doing some preliminary runs it looks like there
> > > >actually has been a timing shift (see attached gif for run 5415 LTOP) I
> > > >need to look at this before I conclude anything-
> > > >
> > > > Pete
> > > >
> > > >On Mon, 15 Mar 2004, Adrian T Sindile wrote:
> > > >
> > > >
> > > >
> > > >>Hi, Vitaliy!
> > > >>I have been dumping those numbers into the database.
> > > >>If I see any problem I will let you know.
> > > >>
> > > >>Adrian
> > > >>
> > > >>-------------------------------
> > > >>Adrian Sindile
> > > >>Research Assistant
> > > >>Nuclear Physics Group
> > > >>University of New Hampshire
> > > >>phone: (603)862-1691
> > > >>FAX: (603)862-2998
> > > >>email: asindile@alberti.unh.edu
> > > >>http://einstein.unh.edu/~adrian/
> > > >>
> > > >>
> > > >>On Mon, 15 Mar 2004, vitaliy ziskin wrote:
> > > >>
> > > >>
> > > >>
> > > >>> Is anyone monitoring tdc positions of a flasher in the tofs as a
> > > >>>function of run numbers. It is very important for the neutron data.
> > > >>>Please, someone who is in charge of tofs, look at it and let me know.
> > > >>>
> > > >>> Chees,
> > > >>>Vitaliy
> > > >>>
> > > >>>
> > > >>>
> > > >
> > > >----------------------------------------------
> > > >Pete Karpius
> > > >Graduate Research Assistant
> > > >Nuclear Physics Group
> > > >University of New Hampshire
> > > >phone: (603)862-1220
> > > >FAX: (603)862-2998
> > > >email: karpiusp@einstein.unh.edu
> > > >http://pubpages.unh.edu/~pkarpius/homepage.htm
> > > >----------------------------------------------
> > > >
> > > >
> > > >
> > > > ------------------------------------------------------------------------
> > > >
> > >
> > >
> >
>
> ----------------------------------------------
> Pete Karpius
> Graduate Research Assistant
> Nuclear Physics Group
> University of New Hampshire
> phone: (603)862-1220
> FAX: (603)862-2998
> email: karpiusp@einstein.unh.edu
> http://pubpages.unh.edu/~pkarpius/homepage.htm
> ----------------------------------------------
>
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