Search found 2346 matches

by DaveC
Thu Nov 29, 2012 10:22 pm
Forum: Announcements and Administration Archive
Topic: Interesting news about a shortage of helium.
Replies: 10
Views: 2157

Re: Interesting news about a shortage of helium.

<r>Just received this through an Agilent (Varian) Vacuum newletter. The Article is entitled: "What Helium Shortage?" <br/> <br/> Gist of the article is that price is currently high, because of several production facilities here and in Europe that are shut down form repairs. Claims that USGS estimate...
by DaveC
Mon Nov 05, 2012 11:35 pm
Forum: Vacuum Technology (& FAQs)
Topic: TCP 121 schematic
Replies: 14
Views: 2971

Re: TCP 121 schematic

<r>Jeroen -<br/> <br/> Not sure if this is all you'll need, but check here:<br/> <br/> Pfeiffer Vacuum TCP 120 121 Manual pdf free ebook download from ...<br/> <URL url="http://ebookbrowse.com/pfeiffer-vacuum-tcp-120-121-manual-pdf-d2531"><LINK_TEXT text="http://ebookbrowse.com/pfeiffer-vacuum- ... ...
by DaveC
Wed Aug 29, 2012 7:46 pm
Forum: Announcements and Administration Archive
Topic: Nikola Tesla museum campaign earns $500,000 online in two days
Replies: 9
Views: 1330

Re: Nikola Tesla museum campaign earns $500,000 online in two days

<t>I am a big boy, too, but i would respectfully request that such diatribes be filtered by simply showing the link. The foul language only indicates the lack of intelligence of the original poster. (not Paul...!!) <br/> <br/> What is most striking about all this interest in Telsa's Museum, is that ...
by DaveC
Mon Aug 27, 2012 7:24 pm
Forum: Announcements and Administration Archive
Topic: OLD BOYS LISTING
Replies: 4
Views: 1222

Re: OLD BOYS LISTING

<t>Richard - <br/> <br/> I had to "derive" a probable first contact date with the "forum" from when I acquired my venerable bell jar vacuum system, which was some time in either late '99 or early 2000. <br/> <br/> I may actually have some correspondence with a real date, but I think the above is a r...
by DaveC
Wed Aug 15, 2012 9:28 pm
Forum: Announcements and Administration Archive
Topic: Suggestions for the Forum for the coming year (2013).
Replies: 12
Views: 2063

Re: Suggestions for the Forum for the coming year (2013).

<t>Good question, Frank .<br/> <br/> <br/> Why not two tiers to the Forum? A Basic level - where the oft-discussed questions of vacuum, power supplies, instrumentation and generalities are dealt with as is necessary for the newer folks.<br/> <br/> An Advanced Topics section could allow more scientif...
by DaveC
Wed Aug 08, 2012 12:54 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: First Light and Plasma Photos
Replies: 17
Views: 2914

Re: First Light and Plasma Photos

<t>Chris - <br/> <br/> Simply a matter of "due diligence"....being careful. One learns in science, not to assume anything unconsciously. Explicit assumptions are often necessary, but when it come to high voltage safety, one should never assume connections are one way or another, without at least att...
by DaveC
Mon Aug 06, 2012 9:32 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: First Light and Plasma Photos
Replies: 17
Views: 2914

Re: First Light and Plasma Photos

<t>Jake - <br/> <br/> From what I see, you have the bottom two stages of a voltage multiplier, which should produce an UNLOADED voltage of roughly 2x the peak to peak voltage across the transformer terminals. <br/> <br/> The NST's secondary may or may not be referenced (or connected) to the case gro...
by DaveC
Wed Aug 01, 2012 10:19 pm
Forum: Announcements and Administration Archive
Topic: As retirement looms........
Replies: 9
Views: 2014

Re: As retirement looms........

"Work expands to fill all available time..." so the old saw goes.

You'll never get bored in retirement....


Dave Cooper
by DaveC
Tue May 15, 2012 10:18 pm
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ: Obtaining that perfect sphere....
Replies: 7
Views: 5465

Re: FAQ: Obtaining that perfect sphere....

I certainly agree with that, 100 %. That some studies indicate a significant amount of fusion occurs outside of the central "focus", supports Richard's point that the quality of focus within a spherical fusor may have a somewhat limited benefit.

Dave Cooper
by DaveC
Mon May 14, 2012 9:36 pm
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ: Obtaining that perfect sphere....
Replies: 7
Views: 5465

Re: FAQ: Obtaining that perfect sphere....

<t>Good thoughts, Richard. <br/> <br/> To add a bit more to the issue of field uniformity, one can estimate the effects of local aberrations in geometry, using the concept of treating such geometry variations as introducing small regions havaing a radius of curvature equal to the size of the feature...