Hello Karen,
At the very worst it means we would need to write
56 lines in the electronics.map file. If it was deemed necessary,
to be neater we could have a LAD section of the parser. We already
parse each detector package slightly differently.
One question about the "LADS fired" signal. This is a trigger
signal. Will it have the nice "retiming" propreties - or do we
just expect the ToF still to always generate the tigger time?
Tim
On Thu, 21 Nov 2002, Karen Dow wrote:
>
> Miro Plesko is designing a special module for the LADS neutron bars
> that will take analog tube signals, discriminate them, AND the bar ends,
> OR all bars, and provide a number of outputs: TDC stops, scalers, and a
> "LADS fired" bit for the sector MLU.
>
> Space constraints on the board will force us to wire the input and
> output signals in a different pattern than the existing TOFs and neutron
> bars. Rather than having all "top" tubes in a group, and all "bottom"
> tubes in another group, LADS will have alternating "top" and "bottom"
> tubes. This has implications for the electronics.map; instead of (LADS
> left top) being in TDC channels 0-27, and (LADS left bottom) in channels
> 32-59, the top tubes will be in channels 0,2,4,6,etc. and the bottom in
> channels 1,3,5,7,etc. Because there are 56 tubes per sector, and the
> ribbon cable comes in groups of 16, we will only use 14 signals per
> cable.
>
> I hope this is not an insurmountable problem, since otherwise the
> module will be much larger, with lots of crossed wires on the pc board.
> Please let me know if you have concerns or objections.
>
> Karen
>
-- ____________________________________________________________________ Timothy Paul Smith Assistant Research Professor Dartmouth College timothy.p.smith@dartmouth.edu Department of Physics and Astronomy -or- tim_smith@mit.edu 6127 Wilder Lab. Hanover, New Hampshire 03755 tel: (603) 646-9346
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