In short, all ADCs are fine or actually have always been.
Please make sure that you do not make conclusion from data taken when
people may be connecting/disconnecting cables in the D-tunnel. Or make
sure people aren't. Rtop16 is just fine, Rtop0 is a (well known) case of
bad connector. However it is true that the R-top16 rate nows sits when
the field is on !
We have to keep R-16 off until this problem is addressed
There are emtpy run sheets to the left of dblast07. Use them !
********** PLAN *************
_ study rates on empty/1.0 sccm taraget with B on, any coincs trigger
as a function of slits. Slits should just cut lifetime. Find injection
and stored beam setting and make sure you communicate that to CCR
_ for rates in this configuration see typical rates during production in
past logbook
_ Run any coincs with low_t (21 mV) and high threshold (31 mV). You don't
need all night for that, just take two good runs.
_ Part of the beam time should be devoted in checking how NC and TOF line
up at the sector MLU's
_ Please check the NC in the trigger. Note, we are actually missing one
connection for the cosmics NC trigger. After we got out of the D-tunnel
I realized NC counter TDC stop are not connected
regards,
-- tancredi
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
On Thu, 17 Oct 2002, Adrian T Sindile wrote:
> After yesterday's studies, I was pretty sure at least part of the
> discrepancies I saw in the TDC and ADC spectra were caused by cables being
> swapped.
>
> I took run 2198 (300K event) with cosmics - again, five ADC channels had
> almost no counts (the only cuts I used when looking at those channels were
> the corresponding TDC >0 and <4000, plus ADC between 0 and 10000).
>
> I decided to get the old TDC cables in - or what I thought the old cables
> were, as I am not 100% sure of the pattern.
>
> Took run 2199 - Right Top TDCs were missing;
> Right 16 Top and Bottom seemed swapped;
> All ADCs were pedestals.
>
> Went to the D-tunnel, found a bad TDC cable - it probably got messed up in
> the swapping process. Chris Brown fixed the cable and I tried to take another
> run.
>
> Took run 2200: Right Top TDCs are back now.
>
> The most annoying problem is the ADCs that are ALL pedestals now. I
> suspect a timing problem, since the voltages are very close to the values
> I had last week, when I was very close to the target values... the ADC
> gate should be checked first.
>
> Pete is here now and will take over.
>
> 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/
>
>
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