Dear all,<br><br>Fortunately, the beam size on the second target region is somewhat big due to big dispersions (~ 1 m) after <br>the spectrometer.<br><br>Full width of electron beam is about 6 mm, and its rms beamsize is about 1 mm.<br>
<br>If we operate in the pulsed mode with a lower current (~ 10 nA), it will be safe.<br>But we need its detailed review against any accident.<br><br>I attached the electron beam profile on the second target in this e-mail.<br>
<br>Sincerely yours,<br><br>Yujong Kim<br><br> <br>
<br><br><div class="gmail_quote">On Tue, Nov 8, 2011 at 9:59 AM, Eric Voutier <<a href="mailto:voutier@lpsc.in2p3.fr">voutier@lpsc.in2p3.fr</a>> wrote:<br><blockquote class="gmail_quote">
<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 class="gmail_quote"><div class="im">
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>
</div><blockquote class="gmail_quote"><div class="im">
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></div>
Eric& I would like to discuss two topics:<div class="im"><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 href="https://positron.jlab.org/wiki/index.php/November_9%2C_2011">https://positron.jlab.org/<u></u>wiki/index.php/November_9%2C_<u></u>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 href="http://opsweb.acc.jlab.org/CSUEApps/atlis/atlis.php">http://opsweb.acc.jlab.org/<u></u>CSUEApps/atlis/atlis.php</a><br>
<br>
<br>
<br>
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</blockquote>
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