From: Frank Geurts (geurts_at_rice.edu)
Date: Thu Jan 23 2003 - 14:01:58 EST
i think we are safe against moving L0s back in time by 1 or 2 rhic
ticks. The system coincidence window is pretty wide open (790ns)
compared to last year's (215ns). If we really want, i suppose we could
shift the window by some 100ns just to make sure we're less susceptible
to another L0 while processing the current one.
-f.
W.J. Llope wrote:
> see below - let's discuss and i'll reply to christie later
> this afternoon - thanks
>
>
>> Delivered-To: llope_at_physics.rice.edu
>> Date: Thu, 23 Jan 2003 13:06:00 -0500
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>> To: starops-hn_at_connery.star.bnl.gov
>> Reply-To: starops-hn_at_connery.star.bnl.gov
>> From: "Bill Christie" <christie_at_bnl.gov>
>> X-HN-Forum: STAR Operations
>> Subject: Input requested concerning change to trigger L0 timing.
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>> Status:
>>
>> Dear Sub System managers,
>> It appears that in order to get the BEMC trigger data properly lined
>> up with the trigger data from the other STAR trigger detectors (i.e.
>> CTB, BBC, and ZDC) that we'll have to insert a one "STAR clock tick"
>> delay into the trigger timing. Note: One "STAR clock tick" is ~ 107 ns.
>> This will change the time between when the collision happens, and when
>> trigger sends out the L0 trigger to the subsystems, from the 13 clock
>> ticks that were used last year to 14 clock ticks.
>> We plan to test this scheme soon. I'd like to hear back from sub
>> system managers any concerns that they may have about this change, and
>> in particular, if this change will necessitate a change to your sub
>> systems setup (logic, delays, NIM setup, etc.) to account for this
>> change. Please get back to me on this ASAP.
>> Greetings from frigid Long Island,
>> Bill
>>
>>
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>
>
>
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