<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
</head>
<body lang="FR" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">Update on APD testing:<o:p></o:p></p>
<p class="MsoNormal">All APD’s have been tested (Volodimir, Emma, Holly). Only 3 + 2 have to be redone. Final analysis, selection, grouping in accordance to HV groups coming very soon. Full report will follow.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">APD gluing (Emma, Volodimir,…): <o:p></o:p></p>
<p class="MsoNormal">on the first batch of 20, we put a bit too much glue, and some of the glue went in between crystal and wrapping, locally increasing the wrapping thickness (most of it was removed)<o:p></o:p></p>
<p class="MsoNormal">on the second batch of 20, we put less glue and did not press so much the crystal onto the APD, letting the weight act during the night. Many ended up with some small bubbles, probably at an acceptable level.<o:p></o:p></p>
<p class="MsoNormal">From the third batch on, we added a scotch tape around the wrapping (to be removed after gluing), and pressed for good contact. Results OK. Only one or two per batch of 20 have occasional bubbles.<o:p></o:p></p>
<p class="MsoNormal">8 batches = 160 completed as of this morning. 1 batch per day.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Crystal testing:<o:p></o:p></p>
<p class="MsoNormal">JLab technician to install today switch-interlock to shut-off high voltage when crystal housing is open.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Frame cleaning:<o:p></o:p></p>
<p class="MsoNormal">Ongoing. Not a small operation either…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><i>Michel Garçon<o:p></o:p></i></b></p>
<p class="MsoNormal"><b><i>--------------------------------------------------------------------------------------------------------------------------------</i></b><b><i><o:p></o:p></i></b></p>
<p class="MsoNormal"><i>Irfu/SPhN
</i><i>Tél.:</i><i> +33 1 69
08 86 23<o:p></o:p></i></p>
<p class="MsoNormal"><i>CEA-Saclay, bât. 703 </i><i>Fax:</i><i>
+33 1 69 08 75 84</i><o:p></o:p></p>
<p class="MsoNormal"><i>91191 Gif-sur-Yvette cedex
</i><i>Courriel:</i><i>
</i><a href="mailto:michel.garcon@cea.fr">michel.garcon@cea.fr</a><o:p></o:p></p>
<p class="MsoNormal"><i>France
</i><a href="http://irfu.cea.fr/Phocea/Vie_des_labos/Ast/ast_groupe.php?id_groupe=495">DSM/IRFU/SPhN/Clas</a><o:p></o:p></p>
<p class="MsoNormal"><b><i><o:p> </o:p></i></b></p>
<p class="MsoNormal"><u>Until October 31st, on leave at<o:p></o:p></u></p>
<p class="MsoNormal"><i>Jefferson Lab<o:p></o:p></i></p>
<p class="MsoNormal"><i>Office in CC-B129<o:p></o:p></i></p>
<p class="MsoNormal"><i>Phone : +1 757 269 7636<o:p></o:p></i></p>
<p class="MsoNormal"><b><i>--------------------------------------------------------------------------------------------------------------------------------</i></b><b><i><o:p></o:p></i></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>