From: W.J. Llope (llope_at_physics.rice.edu)
Date: Tue Mar 04 2003 - 16:28:31 EST
At 4:06 PM -0500 3/4/03, Xu, Zhangbu wrote:
>Hi,
> Does tofp_at_physics.rice.edu have archive which I
>can come back and read it again later?
clearly these are archived... its the main way
we keep track of all the little changes/problems along
the way...
remember that as soon as frank returns you will be
added to this distribution list, so you will have
local copies of all these mails that you can
filter into a 'tofp operations' mail folder for
later reference... (that's exactly what the rest of
us do here)....
> I am not sure whether higher background rate will make
>such a big difference.
agreed...
>We have access tomorrow, I will
>check it!
seems like a simple divide-and-conquer approach is
the best way to hunt down if single chs are now
noisier than before.... all this could be done
fairly quickly at rack 1b-1 using the brown nim scaler...
i.e. if you get ~200 Hz at the output of the tofr
mult logic when you get access, then this new effect
has to be beam-background-related. otherwise, indeed
perhaps a discriminator (fee or platform) has gone bad
- and in that case this ch should simply
be removed as an input to the mult logic.....
> Do we have online display which can quickly spot hot
>channels by the shift crew if there is any?
by design, there are simplified online displays the crew looks
at - and the more detailed displays/analyses come from
reading the localmon data and this is not something the
crew needs to worry about (too much detail). so this is
only a "nearly" real time approach but vastly more sensitive,
and vastly more sane from an operations perspective....
i'm not convinced the shift crew needs to be exposed to the
more detailed analyses as part of their normal duties, since
there are a number of us looking at these data every day
& night...
thanks, regards,
bill
>Thanks!
> Zhangbu
>
>-----Original Message-----
>From: W.J. Llope
>To: startof-hn_at_connery.star.bnl.gov
>Sent: 3/4/2003 4:00 PM
>Subject: Re: TOFr noisy
>
>hello zhangbu,
> first, let me ask that comments related to detailed
>detector operations issues go to tofp_at_physics.rice.edu, not
>startof-hn....
> on your question - i've been looking at the hit
>patterns etc from yesterday and through the last weekend
>and everthing looks o.k.....
>i see the shift log notes a higher-than-normal background
>rate for this spill - would that be enough to explain this?
>thanks for the message,
> bill
>
>At 3:30 PM -0500 3/4/03, Xu, Zhangbu wrote:
>>Hi,
>> The rich scaler indicates there is very high TOFr
>>background rate. Is there anything firing randomly or
>>we have hot channels?
>>The data from CDB board shows that 50% of the events
>>with pVPD coincidence have TOFr hits. It was ~10%.
>>Thanks!
>> Zhangbu
>>
>>
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>--
>
> 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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--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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