From: W.J. Llope (llope_at_physics.rice.edu)
Date: Wed Apr 16 2003 - 15:54:38 EDT
do it!
hasta
At 2:49 PM -0500 4/16/03, Geary Eppley wrote:
>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
>>
>>
>>
--W.J. Llope, Ph.D. Res. Assoc. Professor T.W. Bonner Nuclear Laboratory phone: 713-348-4741 Rice University, MS-315 fax: 713-348-5215 6100 S. Main St. Houston, TX 77005-1892 e-mail: llope_at_physics.rice.edu WWW home: http://wjllope.rice.edu/default.html
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