<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Brian,</div><div><br data-mce-bogus="1"></div><div>Thank you for making a detailed record of this.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>It looks like the 'physical damage' (where the copper braids enter the mounting block) has been there since day one - possibly when the leads were being installed (Mid 2016 I believe).</div><div>I inspected the leads on delivery from the vendor and no physical damage was noted at that point. Solder over-spill on the braids was noted - as a result of the vendors manufacturing process.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>This may also explain why there are copper whiskers within the cabinet - as a result of the lead installation last year.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>However, if copper whiskers are still coming off of the copper braids - this is obviously not acceptable. I shall review how we can prevent this from happening. The braids must stay exposed to the air for cooling purposes so we cannot simply seal them.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>We will need to look at the solenoid power supply cabinet too.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Ruben<br data-mce-bogus="1"></div><div><br></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>From: </b>beng@jlab.org<br><b>To: </b>hallb-engineering@jlab.org, "Glenn Young" <gyoung@jlab.org>, "Rolf Ent" <ent@jlab.org>, "Javier Gomez" <gomez@jlab.org>, "Ruben Fair" <rfair@jlab.org>, "Probir Ghoshal" <ghoshal@jlab.org>, stuart@jlab.org, "rossi patrizia" <rossi@jlab.org>, "dsg-hallb magnets" <dsg-hallb_magnets@jlab.org><br><b>Sent: </b>Thursday, September 28, 2017 4:10:03 PM<br><b>Subject: </b>[New Logentry] Follow-up Re: Torus MPS Faults<br></div><div><br></div><div data-marker="__QUOTED_TEXT__"><style>
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</style><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3486246" rel="bookmark" target="_blank">Follow-up Re: Torus MPS Faults</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3486246" class="lognumber" target="_blank">3486246</a>. Submitted by <a href="https://logbooks.jlab.org/user/beng" target="_blank">beng</a> on Thu, 09/28/2017 - 16:08. </p>
<table class="field-vitals"><tbody><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hbtorus" target="_blank">HBTORUS</a><br data-mce-bogus="1"></td></tr><tr><th>Entry Makers: </th><td>campero</td></tr><tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/3486195" target="_blank">3486195 - Follow-up Re: Torus MPS Faults</a><br data-mce-bogus="1"></td></tr></tbody></table></div>
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<p>Attached are pictures of the copper debris in the Torus MPS.</p>
<p>I added some annotations to the pictures to show the issues I was trying to capture.</p>
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<div class="image-wrapper"><img class="image-style-plentybig" src="cid:62a32ee7a6a95bfc39f250cdfb9e0244@logbooks.jlab.org" alt="" title="Beam Left Lead (facing beam left)" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:531c8450a80265b1bef752154467a6b0@logbooks.jlab.org" alt="" title="Beam Left Lead (facing beam left)" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:d0218677d8b7ed56494ecca04aa372f7@logbooks.jlab.org" alt="" title="Polarity Switch (only annotated some of the debris, there was a lot more)" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:065fa6b4d3532b65f6d71a9219be7124@logbooks.jlab.org" alt="" title="Beam Right Bus Bar (facing beam left)" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:aa3f1a0bdb074f239dd790e6e75226d2@logbooks.jlab.org" alt="" title="Upstream Side of DCCT (facing beam left, to much debris to annotate)" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:9581206266f3fbb9ffc355e5bc260c18@logbooks.jlab.org" alt="" title="Capacitor Bank for DCCT" height="1280" width="960"></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:1bf2c29006bf0e64de6e3996273ce2d5@logbooks.jlab.org" alt="" title="Capacitor Bank for DCCT" height="1280" width="960"></div> </div>
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