RE: end of run measurements

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From: Xu, Zhangbu (xzb_at_bnl.gov)
Date: Thu May 29 2003 - 15:46:54 EDT

 Hi,
Prof. Wu will be able to help you measure the rate!
Can you (Gary) pick him up?
Thanks!
        Zhangbu

-----Original Message-----
From: W.J. Llope
To: TOFp Operations
Sent: 2003-5-29 15:44
Subject: Re: end of run measurements

At 1:05 PM -0500 5/29/03, Geary Eppley wrote:
>Hi Zhangbu et al.
>
>According to Bill Christie, we should get access to the STAR detector
>about 4 pm tomorrow afternoon.
>
>We should plan at that time to take noise rates for the 12 modules that
>are being read out. I think an "or" of the 6 channels for oeach module
>will be sufficient, unless the rate is unusually high or low in which
case
>we might want to look channel-by-channel.

since it takes ~20sec per ch to measure a ch's rate, can't we
just go ahead and take the ch-by-ch numbers?

rates by module would also be interesting to study possible correlated
noise...

> We probably should also take
>noise rates from 2 or 3 high-eta modules that were not included in the
>read out. These modules had noise rates that were 2x the low eta module
>rate but the high eta module that is read out now has a low noise rate
so
>we should verify if this problem has gone away.

indeed. that would be rather interesting if (re) confirmed!

>We might also try to do some tests to see if the correlated noise is in
>neighboring channels in a module.

yep.

>I also would like to turn off the HV and measure the noise rate decay
>in the scaler.

good idea!

cheers,
        bill

>I have to go to JFK at 6:30 so if we don't finish by then, we will need
a
>TOF gas shift until I get back about 10. I can finish anything else we
>want to do by midnight, then shut off the gas.
>
>Cheers,
>
>Geary 

-- 

  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
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