Re: wrong timing in left 14

From: Michael Kohl (kohlm@mit.edu)
Date: Sun Mar 26 2006 - 12:08:43 EST


Hi Chi,

>
> Hi Michael,
>
> I believe the TOF timing claibration is problematic with respect to left TOF
> 14.
>
> please see the atatched figures which shows TOF (left-right) and TOF
> coplanarity between left 14 and right 0.
>

TOF_copl_14_0_14336_14435.ps and
TOF_14_0_14336_14435.ps are identical, where does coplanarity peak for
these runs in 4_17 ?
Coplanarity from before seems to peak at 10ns (also wrong).

> *_all.ps are 4_17 recrunch. they show multiple peak structure.
>
> *_14336_14435.ps are 4_17 recrunch limited to those <100 runs. they have
> single peal but it is obvious from the coplanarity plot that the peak is in
> very wrong place.

->Are all other runs ok, and is the problem only for the above runs?
->Only paddle 14-left?

Mark Steadman had taken care of the 2005 calibrations during last summer.
I'll check the database to see if there's something wrong. It may be that
we did not have the laser signal for that period of time. Sorry for the
trouble.

>
> *_before.ps are online recrunch. all runs. compare to *_all.ps, single narrow
> peaks are seen.
>
> Chi

Regards,

    Michael

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