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Jay et al,<br>
<br>
I used OptiM to look into Jay's plan of switching from the
present isochronous to non zero M56 injector optics. I modeled Jay's
procedure as follows: the same front end as for the isochronous
optics (0L01-05 quads), replacing chicane quads (0R01-07) with the
new values for 'M56 Optics' (drastically different) and then
invoking 0L06-10 quads to match to the desired Twiss values at the
end of the chicane (end of 0R04 dipole) - exactly the procedure that
the multi harp matching tool would do. I got a very reasonable
solution (see the appended slide) where the new quad values do not
differ by much (max 25%). Looks like multi harp should find the
solution this time; in general we should not rely on matching tools
to 'redesign' optics; we have better tools to do it...<br>
Anyway, you may consider my result as the 'design' Optics.<br>
Thanks.<br>
<br>
Alex<br>
<br>
On 1/22/2012 2:40 PM, Arne Freyberger wrote:
<blockquote cite="mid:4F1C6625.2030105@jlab.org" type="cite">I've
found my old studies on non-zero M56 chicane optics. See
attachment: slides that were presented to Bteam, Feb. 2010? <br>
Arne <br>
<br>
On 01/21/2012 11:48 AM, yves roblin wrote: <br>
<blockquote type="cite">On 1/20/2012 2:53 PM, Jay Benesch wrote: <br>
<blockquote type="cite">FYI, just in case you get called about
this. <br>
</blockquote>
<br>
Jay, <br>
Talked to Arne yesterday. We can discuss what we want to do
regarding the M56 monday morning after the 8'o clock. <br>
I asked Alex to come as well since he's done it before. From
your elog/email, I do not see anything wrong with your <br>
settings. Regarding the scraping, I would probably do to
M56 first if we decide to go ahead with it, then reassess the
injector <br>
since we will have to make sure it can do 180. At that point,
we will see if we are still scraping. <br>
<br>
Yves <br>
<br>
<br>
<blockquote type="cite"> <br>
M56 optics Monday? Hand phase all the cavities Monday? Both?
<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807">http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807</a>
<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807">http://opweb.acc.jlab.org/CSUEApps/elog02/elog_item.php?elog_id=1660807</a>
<br>
<br>
-------- Original Message -------- <br>
Subject: Beam: Scraping indeed <br>
Date: Fri, 20 Jan 2012 14:25:52 -0500 <br>
From: Hall C Electronic Logbook <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:cdaq-noreturn@jlab.org"><cdaq-noreturn@jlab.org></a>
<br>
To: <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:benesch@jlab.org">benesch@jlab.org</a> <br>
<br>
<br>
<br>
Link: <a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://hallcweb.jlab.org/hclog/1201_archive/120120142552.html">http://hallcweb.jlab.org/hclog/1201_archive/120120142552.html</a>
<br>
<br>
------------------------------------------------------------------------
<br>
<br>
<br>
User name dalton <br>
<br>
<br>
Log entry time 14:25:52 on January 20, 2012 <br>
<br>
<br>
Entry number 249121 <br>
<br>
keyword=Beam: Scraping indeed <br>
<br>
I agree that it looks like we're scraping the low energy of
the beam off <br>
somewhere. If I compare the attached figure to previous
vertical scans <br>
(links below) then it's the high energy side that looks
reasonable <br>
(width and shape) and the low energy side cut off. <br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://cebaf.jlab.org/elog/entry/1622774">https://cebaf.jlab.org/elog/entry/1622774</a>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://cebaf.jlab.org/elog/entry/1650911">https://cebaf.jlab.org/elog/entry/1650911</a>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://cebaf.jlab.org/elog/entry/1614427">https://cebaf.jlab.org/elog/entry/1614427</a>
<br>
<br>
<br>
<br>
A copy of this log entry has been emailed to: benesch <br>
<br>
<br>
<br>
Figure 1 <br>
<br>
<br>
</blockquote>
</blockquote>
<br>
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