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Article #194Re: Insulator with good heat conductivity
From: Scott Hannahs
Date: Wed, 12 Aug 1992 23:01
Date: Wed, 12 Aug 1992 23:01
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<Lots of arguments about BeO deleted> As a low temp kind o' guy, why not use copper with a covering of cigarette papers. Every cryogenic tool kit has a set of rolling papers. You can hold them in place with the standard GE varnish (7031). This has a breakdown voltage of several (~200-300) V/mil (that's 0.001 inch). The easiest way to get thermal conductivity is to make the insulator much thinner. The problem you might have at high voltage is the ease with which He gas breaks down. There is a minimum in the breakdown voltage around 10 torr and so make sure your leads are well insulated above the liquid near the top of the cryostat. Scott Hannahs, F. Bitter National Magnet Lab, sth@slipknot.mit.edu
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Newsgroups: sci.materials Path: arc1-ca.pugleaf.net!sparky!uunet!snorkelwacker.mit.edu!bloom-picayune.mit.edu!slipknot.mit.edu!sth From: sth@slipknot.mit.edu (Scott Hannahs) Subject: Re: Insulator with good heat conductivity Message-ID: <sth.713660510@slipknot.mit.edu> Sender: news@athena.mit.edu (News system) Nntp-Posting-Host: slipknot.mit.edu Organization: Massachvsetts Institvte of Technology References: <7926@dirac.physics.purdue.edu> <17760005@hpnmdla.sr.hp.com> Date: Wed, 12 Aug 1992 23:01:50 GMT Lines: 15