Re: TOFr TDC range

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From: Geary Eppley (eppley_at_physics.rice.edu)
Date: Wed Apr 16 2003 - 15:49:50 EDT

Hi

There is a 20 ns cable that brings the TOFr TDC start. We will make this 4
ns if that sounds ok to everyone.

Geary

On Wed, 16 Apr 2003, Frank Geurts wrote:

>
>
> W.J. Llope wrote:
> [...]
> >
> > but (because we knew better) we are not using fastbus tdcs in STAR...
> > the camac 2228A's are not nearly this bad. the most
> > one ever might want to avoid is the first ~50-100 chs
> > which is <5% of the dynamic range.
> >
>
> re: shifting the dynamic range for TOFr. I just got off the phone with
> John Mitchell. We discussed a couple of scenarios moving the dynamic
> range for all of TOF or TOFr only. Since TOFp hardly doesn't see any
> non-linearities we thought moving the range of TOFr only may be the best
> way to. The start signal to the TOFr TDCs can be moved backward by
> maximum 16ns allowing the TDC signals to shift by some 300channels.
>
> All this would require is changing the delay cable between TRIG (2-10-2)
> and TOFr-TDC-common-start (4-3).
>
> Other scenarios were far more involving and would mean replacing the
> pVPD discriminators or replacing the EAST/WEST/TRIG logic with a single
> OR (for pp only, though) or delaying all 72 logic cables ...
>
> This brings me to another point: have we -or are we planning to do so
> this week- changed the TRIG logic to 1.OR.1 ... i haven't seen any
> messages w.r.t. this.
>
>
> cheers,
> frank
>
>
>

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