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I need to sit back and develop a path forward for PEPPo and any
other future beamline experiments in terms of documentations and
reviews. It is clear that the nominal ATLis process is not quite
sufficient to cover PEPPo. The Mott installation was similar to the
PEPPo, and I'd be interested to learn what the process was for the
Mott. The Hall process may be also provide a template, again I
need to think about this. <br>
<br>
In terms of Window damage due to beam, we really need to be careful
and attempt to have engineered solutions instead of administrative
solutions. Statements like we will keep the current low 10nA or the
beam mode in tune mode, are administrative and do not really count
as protective measures. Until we have a clear way to protect the
window from a large power density beam (direct electron beam) we may
have to lock the positron target in the in-beam position.<br>
<br>
Arne<br>
<br>
<br>
On 11/08/2011 11:59 AM, Eric Voutier wrote:
<blockquote cite="mid:4EB95FF5.7040004@lpsc.in2p3.fr" type="cite">
<br>
Sounds more than reasonable!
<br>
<br>
I would also add to the previous comments that even in the CW
runnning for polarimeter calibration,
<br>
beam currents will not exceed tens of nA, so no damage to the
vaccum windows are expected.
<br>
Eric
<br>
<br>
<br>
Le 08/11/2011 11:22, Matt Poelker a écrit :
<br>
<blockquote type="cite">On the subject of "check out with electron
beam", I am going to require
<br>
you to write a test plan, and to have it reviewed by
knowledgeable Ops
<br>
staff, like Mike Spata, Jay Benesch, Geoff Krafft and/or Mike
<br>
Tiefenback. The obvious big concern here....how do you plan to
avoid
<br>
burning a hole in the exit foil downstream of the spectrometer?
and if
<br>
you do burn a hole in the exit window, what are the expected
consequences?
<br>
Matt
<br>
<br>
<br>
Joseph Grames wrote:
<br>
<blockquote type="cite">Dear PEPPo Collaborator,
<br>
<br>
We will meet tomorrow Wednesday 11/9 at 10:30EST, locally in
ARC428
<br>
and by call-in is 757-269-6121.
<br>
<br>
Eric& I would like to discuss two topics:
<br>
<br>
*System Readiness* - please post your punchlist of remaining
tasks
<br>
necessary to complete your system to the wiki, meaning all the
steps
<br>
you envision before we are in a position to use/test your
system with
<br>
beam. This should include hardware, software, procedures,
<br>
documentation, cables, labels, jobs in the service building,
jobs in
<br>
the tunnel. Anything you can envision.
<br>
<br>
== (WIKI) ==>
<a class="moz-txt-link-freetext" href="https://positron.jlab.org/wiki/index.php/November_9%2C_2011">https://positron.jlab.org/wiki/index.php/November_9%2C_2011</a>
<br>
<br>
*Check-out with electron beam* - please prepare a straw man
for the
<br>
first test you would like to perform with 6.3 MeV electron
beam,
<br>
meaning who will/can do the test, prerequisites, clock hours
needed,
<br>
possible accesses needed, range of beam current or
polarization,
<br>
hardware/software configurations. Beam tests plans should be
<br>
submitted using ATLIS (go to web site, login, choose create,
pick a
<br>
title beginning with "PEPPO:", fill in the blanks the best you
can).
<br>
If offsite then use proxy to access web site.
<br>
<br>
== (ATLIS) ==>
<a class="moz-txt-link-freetext" href="http://opsweb.acc.jlab.org/CSUEApps/atlis/atlis.php">http://opsweb.acc.jlab.org/CSUEApps/atlis/atlis.php</a>
<br>
<br>
<br>
<br>
------------------------------------------------------------------------
<br>
<br>
_______________________________________________
<br>
PEPPo mailing list
<br>
<a class="moz-txt-link-abbreviated" href="mailto:PEPPo@jlab.org">PEPPo@jlab.org</a>
<br>
<a class="moz-txt-link-freetext" href="https://mailman.jlab.org/mailman/listinfo/peppo">https://mailman.jlab.org/mailman/listinfo/peppo</a>
<br>
<br>
</blockquote>
<br>
</blockquote>
<br>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
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>
<pre class="moz-signature" cols="72">--
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab Office: (757) 269-6268
12000 Jefferson Avenue Cell: (757) 876-6289
Newport News, VA 23606 Email: <a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a>
</pre>
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