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Hi Tim <br>
<br>
Yes, 100 Ohms is probably a fair number. We see between 75 and 85
Ohms on the <br>
good ones and 300-500 Ohms on the bade ones. <br>
<br>
Curtis<br>
<br>
<br>
On 11/11/10 1:13 PM, Tim Whitlatch wrote:
<blockquote cite="mid:4CDC3266.90201@jlab.org" type="cite">
Hi All,<br>
<br>
Patrick Hester has just returned an email asking what limit we
have on
surface resistance from one end to the other. Should we just call
it
100 ohms max?<br>
<br>
Tim<br>
<br>
-------- Original Message --------
<table class="moz-email-headers-table" border="0" cellpadding="0"
cellspacing="0">
<tbody>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">Subject:
</th>
<td>RE: Straws</td>
</tr>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">Date: </th>
<td>Thu, 11 Nov 2010 17:15:28 -0000</td>
</tr>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">From: </th>
<td>Patrick Hester <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:Patrick.Hester@lamina.uk.com"><Patrick.Hester@lamina.uk.com></a></td>
</tr>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">To: </th>
<td>Tim Whitlatch <a moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="mailto:whitey@jlab.org"><whitey@jlab.org></a></td>
</tr>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">CC: </th>
<td><a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:nsj@cmu.edu"><nsj@cmu.edu></a>, "Dave
Clement"
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:Dave.Clement@lamina.uk.com"><Dave.Clement@lamina.uk.com></a></td>
</tr>
<tr>
<th align="right" nowrap="nowrap" valign="baseline">References:
</th>
<td><a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="mailto:4CD83BDA.90907@jlab.org"><4CD83BDA.90907@jlab.org></a></td>
</tr>
</tbody>
</table>
<br>
<br>
<pre>
Dear Tim,
I had a long discussion with Naomi Jarvis this afternoon regarding the
problem of increased surface resistance found on some of the last batch
of straws. All the straws came from a single delivery of coated film
made in one batch. The first straws were made from material which was
slit and which we had in stock as slit film. The balance was from
another roll of film which came from the same mill roll.
It would appear that there is a coating fault maybe on one side of the
roll which has affected some straws due to the coating being below 300
Angstroms. We had shipped the balance of your order today but I have
been able to intercept it before it was loaded onto the aircraft and it
is being returned to Lamina.
We checked the straws for continuity but not their actual surface
resistance. This will now be done before they are reshipped. Please
confirm the resistance limits required over the length of a straw so
that we are able to check them thoroughly against your requirements. I
will make immediate arrangements to source more coated film from a
different supplier to make up the shortage you may encounter due to this
problem.
Please rest assured that Lamina is treating this matter seriously and
will rectify the fault in the material. I look forward to your
instructions. Kind regards. Patrick Hester.
-----Original Message-----
From: Tim Whitlatch [<a moz-do-not-send="true" class="moz-txt-link-freetext" href="mailto:whitey@jlab.org">mailto:whitey@jlab.org</a>]
Sent: 08 November 2010 18:05
To: Patrick Hester
Subject: Straws
Hi Patrick,
We are finding that some of the straws have a higher surface resistance
than the majority. Is there a separate batch that was used for some
straws? Please call me.
Thanks,
Tim
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</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Prof. Curtis A. Meyer Department of Physics
Phone: (412) 268-2745 Carnegie Mellon University
Fax: (412) 681-0648 Pittsburgh PA 15213-3890
<a class="moz-txt-link-abbreviated" href="mailto:cmeyer@ernest.phys.cmu.edu">cmeyer@ernest.phys.cmu.edu</a> <a class="moz-txt-link-freetext" href="http://www.curtismeyer.com/">http://www.curtismeyer.com/</a>
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