From: Xu, Zhangbu (xzb_at_bnl.gov)
Date: Fri Feb 21 2003 - 15:29:00 EST
Hi, Bill:
There are two ways of sending pVPD and TOFr signals to trigger,
1) to CDB board where we can put in all three individual signals
(pVPD east, west, TOFr OR)
2) Send one signal from the AND of pVPDs and TOFr which can be
1.2us after the interaction.
We can always do the second option since we have about 800ns to
spare. So there will be a trigger regardless of the timing. It may
not be as neat as we would like!
I thought we have only 4 days between today's access and Wednesday
access, so if we discover any problem, we can fix it in the next access.
Dick Majka helped me check everything and we found that 3 discriminators
are not good (TOFr 706) and one channel had both input and output
cables plugged into the output of the disciminator (this was fixed).
We have ~2hours more left, should we try to move to other discriminators
to see if this fixes it??
We also put all the cables in and send the TOFr OR signals to
CDB board and RICH scaler. The noise rate is about 200Hz. Since
the signal is in the CDB, we can check offline to see the trigger
rate, timing and bias. If we don't want to do that today, I can
go back now and unplug the cables. Starting from next Wednesday,
we may have access only every two weeks which means we will have
only one more access before switch to pp run.(?)
Thanks!
Zhangbu
-----Original Message-----
From: W.J. Llope
To: Xu, Zhangbu
Cc: tofp_at_physics.rice.edu
Sent: 2/21/03 10:48 AM
Subject: RE: Re: pVPD and TOFr
i would prefer that we make any TOFr mult cabling additions during this
wednesday's access, when all of us will be together out there
and we can set this up in a calm and collected manner.
feel free to run whatever tests of the pVPD->trigger path
that you want. this is a crucial first step. if the
pVPD triggering can't be made to work then there's no sense
in adding all the tofr cabling... its a necessary pre-requisite
all i'm saying is let's take this step by step.. thanks!
bill
>Hi,
> We have restricted access for the next 8 hours!!
> Anything need to be done?
> Since the test Frank and I did last time indicates that
>the effect from second output of 706 is very small. I will
>try to put all the logics in and cables as well to test the
>timing and trigger rate?
>Thanks!
> Zhangbu
>
>-----Original Message-----
>From: W.J. Llope
>To: startof-hn_at_connery.star.bnl.gov
>Sent: 2/21/03 10:26 AM
>Subject: Fwd: Re: pVPD and TOFr
>
>just Cc:'ing startof w/ a message i sent to startrig earlier
>this morning...rgds...
>
>Delivered-To: llope_at_physics.rice.edu
>Date: Fri, 21 Feb 2003 09:40:01 -0500
>To: startrig-hn_at_www.star.bnl.gov
>From: "W.J. Llope" <llope_at_physics.rice.edu>
>X-HN-Forum: STAR Trigger discussions
>X-HN-Re: pVPD and TOFr (hank crawford)
>Subject: Re: pVPD and TOFr
>
>hi hank....
>
>>Hi Zhangbu -- We have a board called the "Minor driver board" that
>>allows us to
>>send 4 CDB monitor signals to the DAQ room. Les is using it for the
FPD
>right
>>now, but when he is done with it we could use it for your new
>>signals. Bring out
>>a ZDCE1, pVPD, TOFr, and a Gate monitor and I think you have all you
>need.
>
>sounds good!
>
>> Any
>>chance to split the signal at the PMT and take an independent path to
>the
>>trigger?
>
>no - not really. we're already doing a balanced split out there
>in front of the pVPD FEE and any add'l splitting there would hurt.
>
>we could however take the analog signals out of the pVPD FEE,
>(which we are not using in this run's configuration) and bring
>those to the platform for discriminating and coincidencing.
>you could gain 30-40ns maybe.
>the timing resn of these signals will be awlful, no doubt, but
>if one is just counting the number of fired pVPD chs, and really
>needs to gain 30-40ns, then building 6 new cables and coming
>off the pVPD FEE analog outputs would be the way to go IMHO...
>
>btw no such shortcuts are possible w/ the TOFr signal timing, which
will
>arrive at the trigger racks 10-20 ns later than typical pVPD signals
>(with the present pVPD cabling)
>
>regards,
> bill
>
>>You could save many ns in cable perhaps. We believe it is best if we
>>can get the signals into the data stream with the ZDC. We could even
>>consider a
>>separate CDB and a separate DSM if it came to that. -- Thanks -- Hank
>>
>>--
>>Hank Crawford, Univ. of California, Berkeley, Space Sciences
Laboratory
>>Phone (LBL) : 510-486-6962 FAX: 510-486-7379 Phone (BNL)
>:631-344-4942
>>
>>
>>-------------------------------------------------------------
>>Visit this STAR HyperNews message (to reply or unsubscribe) at:
>>http://www.star.bnl.gov/HyperNews-star/get/startrig/2085.html
>
>--
>
> W.J. Llope, Ph.D.İİİİİİİİİİİİİİİİİİİİİ Res. Assoc. Professor
> T.W. Bonner Nuclear Laboratoryİİİİİİİİ phone: 713-348-4741
> Rice University, MS-315İİİİİİİİİİİİİİİ fax: 713-348-5215
> 6100 S. Main St.İİİİİİİİİİİİİİİİİİ
> Houston, TX 77005-1892İİİİİİİİİİİİ
> e-mail: llope_at_physics.rice.edu
> WWW home:İİ http://wjllope.rice.edu/default.html
>
>--
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>
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>Visit this STAR HyperNews message (to reply or unsubscribe) at:
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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
>
>--
>
>
>-------------------------------------------------------------
>Visit this STAR HyperNews message (to reply or unsubscribe) at:
>http://www.star.bnl.gov/HyperNews-star/get/startof/423.html
--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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