From: Frank Geurts (geurts_at_rice.edu)
Date: Fri Feb 21 2003 - 11:50:17 EST
yep.
W.J. Llope wrote:
>
> was that TOFp ADC replaced last wednesday?
>
>
>
>
> At 8:26 PM -0600 2/19/03, Frank Geurts wrote:
>
>> Xu, Zhangbu wrote:
>> [ ...]
>>
>>>
>>> Frank and I will check two things:
>>> 1) measure the timing delay between first discriminator and the
>>> output from West and East coincidence.
>>
>>
>> During today's access, Zhangbu measured the timing between the input
>> to the 3rd discrimination of pVPD W3 (PS708, 1-11-6) and the output of
>> the WEST coincidence (LC365, 2-12-2) to be 27ns. For more details see
>> http://mac8.rice.edu/~TOF/TOFp/operations/manuals/local_trg.html and
>> the reference to the Run-III diagram.
>>
>> 2) Measure the effect of the second output from Model 706 discriminator.
>>
>> The second test we did was measuring the contribution to the time
>> resolution from loading one or two channels of a PS706 discriminator.
>> The setup (see diagrams in above link) involved temporarily replacing
>> the quad input, which is used as a fan-out unit (LC622, 2-9-1) with a
>> spare ps706 channel. In this test we either one or two of the PS706
>> outputs and ran the local DAQ in a pulsing stand-alone mode.
>>
>> A quick analysis shows that on the average the time-resolution of all
>> 72 TOFr channels, as expected, detoriates but only with some 0.02 to
>> 0.03 TDC bins which translates into roughly 1 to 1.5ps.
>>
>>
>> 3) Zhangbu removed the 4ns cable and the fan-out unit which sends the
>> EAST and WEST coicidences to his trigger rack. This should safe at
>> least some 12ns in the "STAR pVPD-trigger" timing. With the additional
>> removal of a discriminator on his side the STAR-pVPD trigger ought to
>> be timed in properly now.
>>
>> -frank
>
>
>
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