But what if those cables are BAD?! Did you think of that?!
Nik sent a message on Friday about the start counter cables, and Peter has
spent the whole shift to find out what is bad with the trigger!!!
It was just a message which was suppose to be read!
UNLESS we FIX the start counter cables we DON'T have to use them anymore!!
-----------------------
Octavian F Filoti
Nuclear Physics Group
Univ. of New Hampshire
9 Library Way
Durham, NH 03824
phone: (603)862-1691
FAX: (603)862-2998
email: ofiloti@unh.edu
On Mon, 28 Oct 2002, Tancredi Botto wrote:
>
> The start counter is physically on the beam right and patched in
> to channels L16 in order to make a trigger. Note, the start counter
> cables are 46 and 47, as they should be and we should not swap them
> in the hall which brings confusion.
>
> The retiming OR TDC is connected to right TDC channel 32 as it was
> back in july. The meantimer OR output is only plugged in for the
> right sector. To avoid confusion with the rear pins, I disconnected
> the left-sector input.
>
> The goal of tonight is to take retime data since the retime may
> need an adjustment given the new TOF voltages. The plan is to take
> data at both the high and low voltage setting for the TOF.
>
> The macro for analysis are in commis/phase1/retime_macros
> The trigger file will be retime_right_l16.settings
>
>
> the goal is to make sure that (RetimeOR - start_counter_tdc_sum) is
> a constant for all 16 right TOF's.
> >From what I recall since july this can be done in less than a shift
>
> As a double check we should also patch the start counter to right 16,
> disconnect r15. Now, to avoid the start counter signal to reach first into
> the meantimer, you have to replace the meantimer right-side input with a
> "special" cable where channel #15 is "cut out". Please look in logbook 2,
> where all this is explained. This check can be done just at one voltage.
> Change the trigger to retime_right_r16.settings
>
> In this latter case, the analysis should show that for all tof's the
> retime_OR is still a constant although of different value since the TDC
> offsets for start counter channels L16 and R16 is different. Make sure
> that the R16 delays are now the same of what you had on L16 and change
> the trigger accordingly.
>
>
> The trigger is still non-strobed (it must stay that way). All data of
> tonight should also be used to analyze and extract the TDC offsets.
>
>
> --
> ________________________________________________________________________________
> Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
> research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>
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