<\/a>Bemco, ready to close <\/div>
<\/div><\/div>
<\/a>
<\/a>Power wiring <\/div>
After having gone through the vacuum bulkhead<\/div><\/div>
<\/a>
<\/a>Bemco in progress <\/div>
Looking through the window. The chamber's a float pressure now (0.5% atmosphere)<\/div><\/div><\/div>
<\/a>
<\/a>Important gadget <\/div>
Once under vacuum, this highly calibrated piece of scrap metal holds the latch open. Then when pressure builds, the door will open rather than the chamber exploding<\/div><\/div>
<\/a>
<\/a>Don fixing a computer <\/div>
It needs a fiber optics card replaced<\/div><\/div>
<\/a>
<\/a>Becky cleaning <\/div>
All of the cryostat parts need cleaning before insertion<\/div><\/div><\/div>
<\/a>
<\/a>Anne doesn't think that cleaning, taping, and bolting are "science" <\/div>
<\/div><\/div>
<\/a>
<\/a>The science sign disagrees <\/div>
<\/div><\/div>
<\/a>
<\/a>Johanna and Becky covering the center hole of the shield <\/div>
<\/div><\/div><\/div>
<\/a>
<\/a>Spanky <\/div>
<\/div><\/div>
<\/a>
<\/a>Sasha finishes up the back of the cryostat <\/div>
<\/div><\/div>
<\/a>
<\/a>Fully loaded Spider <\/div>
Actually, one of the inserts is a lie. Can you spot which one?<\/div><\/div><\/div>
<\/a>
<\/a>Ziggy, double thumbs-up <\/div>
<\/div><\/div>
<\/a>
<\/a>Flexible heat straps <\/div>
Providing 4K and 1.4K to each insert<\/div><\/div>
<\/a>
<\/a>Complete back of one insert <\/div>
<\/div><\/div><\/div>
<\/a>
<\/a>Jon documenting <\/div>
Presumably in a studied manner, not my ignorant snapping<\/div><\/div>
<\/a>
<\/a>Kevlar straps <\/div>
To catch the tank if things break when the payload lands<\/div><\/div>
<\/a>
<\/a>Center tube <\/div>
Used for wiring<\/div><\/div><\/div>
<\/a>
<\/a>Outer edge of the cryostat <\/div>
Contains multi-layer insulation ("MLI", many layers of shiny aluminized mylar) and cables<\/div><\/div>
<\/a>
<\/a>The capillary <\/div>
Transports liquid helium between the main tank and the superfluid tank<\/div><\/div>
<\/a>
<\/a>Sasha tapes the edges of a filter stack <\/div>
The filters reflect unwanted light, to prevent it from warming the cryostat<\/div><\/div><\/div>
<\/a>
<\/a>The stack. Stacked <\/div>
<\/div><\/div>
<\/a>
<\/a>Reflections of overhead lights in the filter <\/div>
The surface is a finely-patterned metal mesh. You can distinguish filters by their reflection pattern<\/div><\/div>
<\/a>
<\/a>Reflections of overhead lights in the filter <\/div>
The surface is a finely-patterned metal mesh. You can distinguish filters by their reflection pattern<\/div><\/div><\/div>
<\/a>
<\/a>Top of cryostat <\/div>
With metal base of vapour-cooled shield (VCS) (cooled by boiling helium vapour)<\/div><\/div>
<\/a>
<\/a>
<\/a>
<\/a>
<\/a>![\"Anne](\"http:\/\/farm8.staticflickr.com\/7399\/9051687321_eb11e8713e_n.jpg\")
Team Toronto (plus Don) spent yesterday conducting a Bemco (thermal\/vacuum) test. This mainly involves waiting around while temperatures or pressures change very slowly. As such, I took occasional sanity breaks and visited everybody else. The cryo team had finished with the telescope inserts and was closing up the cryostat. This mainly involved installing the vapour cooled shields (VCS). These are shells within the cryostat cooled by helium boil-off and insulated with many layers of aluminized mylar (aka MLI: multi-layer insulation). […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16,8],"tags":[],"_links":{"self":[{"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/posts\/6184"}],"collection":[{"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/droppingballast.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6184"}],"version-history":[{"count":3,"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/posts\/6184\/revisions"}],"predecessor-version":[{"id":6187,"href":"http:\/\/droppingballast.com\/index.php?rest_route=\/wp\/v2\/posts\/6184\/revisions\/6187"}],"wp:attachment":[{"href":"http:\/\/droppingballast.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/droppingballast.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6184"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/droppingballast.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}