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Registered Member #2814
Joined: Wed Apr 21 2010, 12:28PM
Location: Scotland, UK
Posts: 24
Proud Mary wrote ...
So many items came up at the same time that I had to let the Tongsten go. In any case, it's too thick for good GM and proportional
tubes.
I did get a little carried away there but was working on the theory that thick Wwire > no Wwire. Having had a closer look at the picture though I am becoming a bit concerned about it. Either it's a larger spool than it looks or the wire is less than .8mm, the postage cost they quoted wouldn't cover a large spool either so either it's thinner or not Tungsten. If it is though I'll be happy to share some with anyone who has a use for it.
Other than that I'm happy with what I've already purchased so just it's between you and Albert
Proud Mary wrote ...
Lastly, here's another CERN GEM detector paper, with details of the hole morphology:
Thanks for that link, it certainly looks like it wouldn't be too difficult to make though the thinner laminates are a bit on the expensive side.
I'd be interested to know how they etched the insulator as it would remove the tricky precision drilling stage.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Kilham wrote ...
Proud Mary wrote ...
So many items came up at the same time that I had to let the Tongsten go. In any case, it's too thick for good GM and proportional
tubes.
I did get a little carried away there but was working on the theory that thick Wwire > no Wwire. Having had a closer look at the picture though I am becoming a bit concerned about it. Either it's a larger spool than it looks or the wire is less than .8mm, the postage cost they quoted wouldn't cover a large spool either so either it's thinner or not Tungsten. If it is though I'll be happy to share some with anyone who has a use for it.
Other than that I'm happy with what I've already purchased so just it's between you and Albert
Proud Mary wrote ...
Lastly, here's another CERN GEM detector paper, with details of the hole morphology:
Thanks for that link, it certainly looks like it wouldn't be too difficult to make though the thinner laminates are a bit on the expensive side.
I'd be interested to know how they etched the insulator as it would remove the tricky precision drilling stage.
The thinner the wire in a GM tube, the higher the field density on its surface. That doesn't mean that thicker W wire won't work - it certainly will - but the thinner wire will produce a tube of greater sensitivity and lower plateau voltage. I've just bought some very fine gold-plated copper wire used in jewellery, since gold-plated wires will be more resistant (in theory) to corrosion by halogen quench agents. Usually, Au on W is called for by patentees, but as lots of GM tubes use a small spring to maintain tension on the centre conductor, I see it as being more a question of having a softer spring for the Au/Cu wire.
As for the GEM detectors, if one is interested in detection, rather than pixellation, I can't see any reason for not using Thick GEMs, made out of FR4 board or what have you. You could still get fairly accurate azimuth and altitude data from them if you are interested in muons and what not.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
IntraWinding wrote ...
I have Canon Gold plated Corona Wire, 50u with 0.3u gold.
I think it's tungsten.
Any use?
Make a multiwire detector with it, pump it down with your new diff pump, and backfill with Ar and the merest whiff of ethanol to 10 torr. I'd expect it to Geig somewhere between 1 & 2kV.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
I was using it for a home designed electrostatic precipitator for my water free PC cooling system, but decided I'd probably give myself ozone poisoning. I might get back to it later for a 'clean room' glove box idea.
Registered Member #2261
Joined: Mon Aug 03 2009, 01:19AM
Location: London, UK
Posts: 581
Kilham wrote ...
Just a quick post, the W wire arrived today, calipers say it's .2mm so if anyone needs a couple of metres just let me know.
Tony.
Likewise my 0.05mm W with 0.3u Au.
I've also dug out a Leybold Thermovac TR 201 with a spare head (i.e. the metal part) in an original Leybold box.
It came in that bargain box of vacuum equipment years ago (those were the days, when eBay was characterised as giving you access to everybodies cupboard under the stairs!) and I'd forgotten about it.
It has a manual, but it's not much use. Basically it's a Pirani type gauge, but you'd have to figure out how to use it and if it works (the pictures are of a similar one on eBay).
This is a different version of the manual to my hard copy, but it contains similar info I think: ]leybold_thermovac_tr201_-_tr205_-_tr206.pdf[/
file]
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Radioactive Mineral Sample Prospecting Equipment - Advice Sought
