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Hello All & Alex,<br>
<br>
If integrated mode is not operational, there is no real reason to
put the beam in the polarimeter for the <br>
measurements. In fact, event a 30 pA CW beam at 6 MeV is expected
to give you 1 MHz counting rate,<br>
meaning to much pile-up to make sens of the semi-integrated or
sample method. <br>
<br>
I suggest that you send the beam in the spectrometer dump with
closed -jaws, and you run ALL crystals<br>
to try to measure an asymmetry connected to the background in
semi-integrated mode. I put an ATLIS <br>
in that sens about a week ago "PEPPo shielding quality
assesment". The idea is to be as close as possible <br>
to real experimental conditions in terms of counting rates, and
take the data for different configurations of <br>
bend angle of the beam, with and without production target, but
making sure that the background we measure <br>
is coming from this area (therefore the closed jaws).<br>
<br>
This would be a very valuable measurement checking all the TI's
and adding info to progress on PEPPo <br>
operation. Even only 4 different setting would help to understand
things.<br>
<br>
- Make sure to apply LV in the service building, by default I
disconnected it.<br>
- Check MJL (I in principle reshaped it for 100ns wide, before we
understand what Tony observed) and make <br>
sure FADC trigger is L1A.<br>
<br>
Have fun, Eric<br>
<br>
<br>
Le 02/04/2012 11:49, Alexandre Camsonne a écrit :
<blockquote
cite="mid:CAP0WL2x5JvbMv3Q3jq8-ENnt_PCEETZy6qBes9L=Frpo5gO2UA@mail.gmail.com"
type="cite">
<p>I have a bit of problem adapting mode 3 to the usual event
structure most likely still some typos in read out code but
maybe an interference between boards too, so i think i mostly
want to take data in sample with new and old TI, this should
work transparently in decoder, to have a first glimpse at
background and asymmetries. If we have i could take a short run
in mode 3 with the readout which is working.</p>
<p>So in 60 minutes,<br>
we could try tune beam in Compton 15 20 minutes</p>
<p>power one peripherical crystal</p>
<p>take amplified data sample old ti 5min<br>
take amplified data new TI 5 mins<br>
take amplified data new TI buffered 5 mins<br>
</p>
<p>We should see an asymmetry.</p>
<p>We could take a run in mode 3 if time allows but i still need
to make sure and set pedestals right so that might wait fir next
week.</p>
<p>Alexandre<br>
</p>
<div class="gmail_quote">On Apr 2, 2012 11:31 AM, <<a
moz-do-not-send="true" href="mailto:fanchini@jlab.org">fanchini@jlab.org</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote">
<br>
IOf Riad and alex are working to compute charge asymmetry with
BCM0L02,<br>
this should be ok. They already have the stuff to use. If they
want to use<br>
mode 3 (new fadc) i can say not. I did not finish and here i
couldn't work<br>
on it.<br>
E.<br>
<br>
<br>
> This is just a reminder that we're planning to execute
our first CW beam<br>
> test tomorrow planned to begin ~noon:<br>
> <a moz-do-not-send="true"
href="http://opsweb.acc.jlab.org/CSUEApps/atlis/task/12270*">http://opsweb.acc.jlab.org/CSUEApps/atlis/task/12270*</a><br>
><br>
> Alexandre/Riad* - What is the status of the DAQ, as I
know a bunch of<br>
> work was planned since last Thursday?<br>
> *<br>
> **Eric/Erica* - We know you won't be here and received
your advice<br>
> below. Have you closed the loop w/ Alexandre or Riad for
the exact<br>
> measurements you'd like to have made. _Assume <60
minutes total test<br>
> time_.<br>
> *<br>
> Leke/Paul* - Will one of you be around in the afternoon
to test if your<br>
> repair last week solved the fiber array signal problem.
_Assume <30 min<br>
> total test time._<br>
><br>
> *Tony *- If time permits do you want us to make a
measurement w/ cw beam<br>
> on target viewer (50-1000pA); if yes, please spell out
the conditions<br>
> you'd want. _Assume <30 minutes total test time_.<br>
><br>
><br>
><br>
><br>
><br>
><br>
> _______________________________________________<br>
> PEPPo mailing list<br>
> <a moz-do-not-send="true" href="mailto:PEPPo@jlab.org">PEPPo@jlab.org</a><br>
> <a moz-do-not-send="true"
href="https://mailman.jlab.org/mailman/listinfo/peppo">https://mailman.jlab.org/mailman/listinfo/peppo</a><br>
><br>
<br>
<br>
_______________________________________________<br>
PEPPo mailing list<br>
<a moz-do-not-send="true" href="mailto:PEPPo@jlab.org">PEPPo@jlab.org</a><br>
<a moz-do-not-send="true"
href="https://mailman.jlab.org/mailman/listinfo/peppo">https://mailman.jlab.org/mailman/listinfo/peppo</a><br>
</blockquote>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
PEPPo mailing list
<a class="moz-txt-link-abbreviated" href="mailto:PEPPo@jlab.org">PEPPo@jlab.org</a>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/peppo">https://mailman.jlab.org/mailman/listinfo/peppo</a>
</pre>
</blockquote>
<br>
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