<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Counterclockwise looking down the beam in the direction of the electron movement.<div><br></div><div>Steve</div><div><br><div><div>On Jul 11, 2016, at 2:55 PM, David Douglas <<a href="mailto:douglas@jlab.org">douglas@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div bgcolor="#FFFFFF" text="#000000"><p>Which direction is the observer looking... at the direction from
which the beam comes, or in the direction of beam motion?</p><p>Thanks!<br>
</p>
<br>
<div class="moz-cite-prefix">On 7/11/2016 2:54 PM, Stephen Benson
wrote:<br>
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<blockquote cite="mid:3B8FC23D-C56E-48DD-9EB4-2AD0488FC7B1@jlab.org" type="cite">
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Just for information sake, the skew quads are rotated 45 degrees
counterclockwise from their normal quad orientation.
<div><br>
</div>
<div>Steve</div>
<div><br>
<div>
<div>On Jul 6, 2016, at 8:49 PM, David Douglas <<a moz-do-not-send="true" href="mailto:douglas@jlab.org">douglas@jlab.org</a>>
wrote:</div>
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<div bgcolor="#FFFFFF" text="#000000"><p>oops... one other remark: in principle, the "parity"
will be defined by the rotation angle of the skew quad,
which is either +45 degrees or -45 degrees, looking
either up-beam or down-beam... which translates into
either positive or negative skew quad when a positive
(horizontally focusing) normal quad is rotated.</p><p>So, there are only 8 possible combinations for any
particular code... ;)</p><p><br>
</p>
<br>
<div class="moz-cite-prefix">On 7/6/2016 10:59 AM, Michele
Joyce wrote:<br>
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<blockquote cite="mid:99a5c21e-dc6d-9924-5d0b-4cd5990a8be5@jlab.org" type="cite">
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<font size="-1"><font face="Helvetica, Arial,
sans-serif">Should this info be kept and maintained
in the LED?<br>
Michele<br>
</font></font><br>
<div class="moz-cite-prefix">On 7/5/2016 12:26 PM, David
Douglas wrote:<br>
</div>
<blockquote cite="mid:4ba89913-8f9d-e7b3-01c0-304b0441e2a1@jlab.org" type="cite">
<meta content="text/html; charset=windows-1252" http-equiv="Content-Type"><p>Thanks Jim.</p><p>Part of the need for the polarity check is to
establish the "parity" of the skews (which differs
between EPICS and codes). I don't want to introduce
bias, but if we could measure the poletip field
(with sign) of each quad and log it, we'll save time
overall. I'll sketch up a procedure.</p><p>Thanks</p><p>D<br>
<br>
</p>
<br>
<div class="moz-cite-prefix">On 7/5/2016 11:00 AM, Jim
Coleman wrote:<br>
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<blockquote cite="mid:d36fe04c-3d43-1eb6-667e-51e0562bbeef@jlab.org" type="cite">
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<div class="moz-cite-prefix">Hi Dave,<br>
We haven't powered any of the 4F quads yet. That
will not happen until the spool pieces are
installed due to splitting of the magnet. We have
to perform a voltage/ current/ polarity
measurement of any magnet as part of the HCO.
I'll make sure LCW gets put on the skews.<br>
-Jim<br>
<br>
On 7/5/2016 10:08 AM, David Douglas wrote:<br>
</div>
<blockquote cite="mid:b4ae5b07-5b88-c627-10db-5b4804ec95ec@jlab.org" type="cite">
<meta content="text/html; charset=windows-1252" http-equiv="Content-Type"><p>re: #2) - please put the results of the test
into the LERFLog. Thanks</p><p>D<br>
</p>
<br>
<div class="moz-cite-prefix">On 7/5/2016 10:07 AM,
David Douglas wrote:<br>
</div>
<blockquote cite="mid:6a9eb3d7-20b1-2588-1c2f-b39284257529@jlab.org" type="cite">
<meta content="text/html; charset=windows-1252" http-equiv="Content-Type"><p>Hi Jim - don't know if the following was
communicated to you or not, but</p><p>1) Steve asked if the 10 additional skew
quads needed water cooling. Answer: if the
other quads are run with water cooling, these
will need it as well. They run at the same
fields as the normal quads.</p><p>2) Has each quad been polarity checked (i.e.
a Hall probe put on each pole of each quad)?
We need to be sure there are consistent sign
conventions through 4F, and I'll need to know
what pole of each quad is at what sign and
field level when the usual +5A test current is
being run.</p><p>Thanks,<br>
DD</p><p><br>
</p>
<div class="moz-cite-prefix">On 6/30/2016 4:32
PM, Jim Coleman wrote:<br>
</div>
<blockquote cite="mid:8daf15ae-9173-d459-1628-4a8427a82d32@jlab.org" type="cite">apologies for sending it out late
<br>
<br>
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