<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">HI, Michael. We will take a look at this. Lou has spent some time on the mechanics as well and so it might be a good idea to discuss the ideas together in a meeting perhaps next week before sending something to Carl.<div class="">Cheers, KK<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 7, 2019, at 11:44 PM, Michael Gericke <<a href="mailto:Michael.Gericke@umanitoba.ca" class="">Michael.Gericke@umanitoba.ca</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Hello everyone,<br class=""><br class="">I am attaching my conceptual design for the detector mounting structure.<br class="">Since we haven't had anything of this sort ready for getting meaningful<br class="">cost estimates (and I had to do this for the CFI quotes anyway), I decided<br class="">to make a design that could be submitted to a company for a quote request.<br class="">I am still waiting for them to get back to me.<br class=""><br class="">The attached pdf is CAD generated and you can zoom in and rotate the<br class="">models. If you wish to have the CAD files, I'll be happy to upload them<br class="">somewhere. The attached movie illustrates how the individual modules<br class="">can be assembled (sorry, the files are fairly large, so one has to be patient).<br class=""><br class="">A few points I want to make:<br class=""><br class="">1) As I said, this is a conceptual design and I am pretty sure it can be optimized.<br class=""> I tried to balance mounting rigidity with as small a material budget as possible,<br class=""> but I am sure one can further improve on that. Maybe it will provide some food<br class=""> for thought for the group working on the structure design.<br class=""><br class="">2) Some of the parts are complicated; The company I spoke to said that they could<br class=""> either 3D print or use a 5 axis CNC to make the more complicated parts, but I expect<br class=""> the cost to be higher than what we budgeted up to now, especially if we decided that<br class=""> we want to us a carbon fiber based material, rather than aluminum.<br class=""><br class="">3) I think I know how one could simplify the complicated parts and make it cheaper, but at<br class=""> the cost of less rigidity, I think.<br class=""><br class="">4) This design treats the PMT-LG-Quartz assembly as a unit, which will make light tight sealing<br class=""> easier. The mounting plates for each module would allow using washers to adjust angles, if<br class=""> need be.<br class=""><br class="">5) The extra space needed by the "skeleton" for each module causes the rings to be spread out<br class=""> a little more, in the beam direction. One can play around with the structure to squeeze that<br class=""> together, but I would caution against overdoing that, as it could get impossible to assemble<br class=""> and service parts. It would be better to adjust quartz tile size and mounting radii.<br class=""><br class="">6) I think we will need two separate, concentric cylindrical structures, one that will hold the<br class=""> modules, as in this design, and a separate one that will hold the shielding. I don't think we<br class=""> can afford to have a high weight load on the module structure, as it was suggested in the<br class=""> previous designs.<br class=""><br class="">7) We will need to think about whether we need to flush the light guide with dry air, to prevent<br class=""> possible reflectivity degradation, which would further complicate the design. The modules would<br class=""> support a light and air-tight bag around each one and one could imagine feeding the air through<br class=""> the PMT housing.<br class=""><br class="">So, while this still just a preliminary design, I think it can serve as a first basis for a real cost<br class="">estimate of the mounting structure and will show the CDR committee that we have at least<br class="">thought about the mounting details.<br class=""><br class="">As soon as I have a quote for the module parts, I will pass it on to Carl.<br class=""><br class="">Cheers,<br class=""><br class="">Michael<br class=""><br class=""><br class=""><br class=""><br class="">-- <br class="">--<br class="">Michael Gericke (Ph.D., Professor)<br class=""><br class="">Physics and Astronomy<br class="">University of Manitoba<br class="">30A Sifton Road, 213 Allen Bldg.<br class="">Winnipeg, MB R3T 2N2, Canada<br class=""><br class=""><span id="cid:1938C0F9-9F97-46C0-9786-BCE71F176E45"><ThinDetectorArrayAssembly.pdf></span><span id="cid:23BF4B53-5054-4E5C-A417-E5D62746FA1F"><R5-AssemblyMovie_x264.mp4></span></div></div></blockquote></div><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">C-111, Physics Building</div><div class="">Stony Brook University</div><div class="">631-632-8119</div></div></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
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