karen,
do you suspect that's why the 2nd level trigger appears to have lower
rates? (ie. the wrong type of coincidence event: you change this, and
that breaks down simultaneously)
--chris
Karen Dow wrote:
>
> Perhaps there is something flaky with the left FASTBUS crate power
> supply; maybe one of the DC voltages drifts sometimes, causes the TDCs
> to register overflows rather than valid times, and power-cycling the
> crate resets it. Although I've looked at the front panel meter, and
> not seen anything wrong...
>
> There's a repaired power supply on its way back from New Mexico, and
> we could try to swap that in if this problem persists.
>
> Karen
>
>
> At 08:10 PM 12/8/2003 -0500, you wrote:
>
>> Operators: adrian tancredi nikolas
>>
>> Hall was open between 3 and 6 PM.
>> A broken wire from the right WC was fixed.
>>
>> All runs taken before are being crunched...
>> Left TOF TDCs disappeared again right before 8 PM. Tancredi power
>> cycled the crate - that brought TDCs back. Maybe this was just
>> overheating?...
>>
>> Looking at the runs we took over the weekend, we realized most of
>> them were OK. The problem was that after run 3629 the left TOF TDCs
>> had lots of overflows (good data was there too, so analysis should be
>> OK) and that threw off the fit of the TOF monitor, resulting in data
>> points all over the place... we do not know why we had those
>> overflows (hot channels?)...
>>
>> Adrian
>
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