Search found 55 matches

by Digix
Sat Jun 07, 2008 11:32 pm
Forum: Vacuum Technology (& FAQs)
Topic: Few questions about vacuum technology
Replies: 4
Views: 2269

Re: Few questions about vacuum technology

Thank you.
But please more about calibration. how do you calibrate gauges?
since I think if you buy any gauge it will show nonsense without calibration unless it comes packed with controller.
by Digix
Sat Jun 07, 2008 12:44 am
Forum: Vacuum Technology (& FAQs)
Topic: Few questions about vacuum technology
Replies: 4
Views: 2269

Few questions about vacuum technology

<t>During my work I faced some problems:<br/> <br/> 1: How to make electric connections to the vacuum chamber. If I made vacuum chamber of glass then it is problem to connect tubes and also it is quite hard to fuse wires into glass without cracking. If I select metallic plate it probably will short ...
by Digix
Tue Jun 03, 2008 12:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange pump behavior
Replies: 6
Views: 2344

Re: Strange pump behavior

<t>Frank S. wrote:<br/> > The best you can hope for with this arrangement can be achieved if the piston pump is the first pump in the series. .<br/> > <br/> > Frank S.<br/> <br/> Are you sure for this? since it looks quite impossible to do anything in that way because if I put piston pump first vacu...
by Digix
Tue Jun 03, 2008 12:22 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: this will do the trick... new IGBTs
Replies: 5
Views: 3547

Re: this will do the trick... new IGBTs

<r>it would be better if you could post your schematic.<br/> all I can say is, that if you drive GDT with such waveform as here it will be bad.<br/> <URL url="http://users.tkk.fi/~jwagner/tesla/SSTC/pics-design/pulse-xfmr-signal.jpg"><LINK_TEXT text="http://users.tkk.fi/~jwagner/tesla/SSTC ... signa...
by Digix
Mon Jun 02, 2008 11:18 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange pump behavior
Replies: 6
Views: 2344

Re: Strange pump behavior - Oil sealing mechanism uses atmospheric pressure to function

<t>Michael's theory can be right, since when under atmospheric pressure vane pump produces much more sound than under that weak vacuum. <br/> <br/> Unfortunately use of second vane pump will be too expensive option, probably it would be better to buy 2-stage pump instead of second 1-stage in that ca...
by Digix
Mon Jun 02, 2008 2:23 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: this will do the trick... new IGBTs
Replies: 5
Views: 3547

Re: this will do the trick... new IGBTs

<t>Controll logic is most important to keep them alive.<br/> <br/> if you will try to control them with no deadtime (just feed square wave to transformer)<br/> they probably will blow up no matter what ratings, because of shoot through currents.<br/> I blew up few mosfets in that way before i even c...
by Digix
Mon Jun 02, 2008 12:55 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange pump behavior
Replies: 6
Views: 2344

Strange pump behavior

<t>I have one stage vane pump for refrigeration and of course it cant produce enough vacuum, so I added piston compressor in series which makes about 50torr vacuum.<br/> <br/> And the big surprise is that this dual stage system works significantly worse than vane pump alone.<br/> If I disconnect com...
by Digix
Fri Jan 18, 2008 2:06 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Proton-Carbon fusion.
Replies: 3
Views: 2472

Proton-Carbon fusion.

<t>How possible is H1+C12 reaction? carbon have perfect physical propereties, so I would like to try just smash protons(or maybe something other easily obtainable) into carbon plate.<br/> <br/> I do not expect to power a town with this reaction, but it would be interesting to do some easy nuclear re...
by Digix
Thu Nov 29, 2007 12:49 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Cold fusion hypothesis: Capacitance
Replies: 13
Views: 4895

Re: Cold fusion hypothesis: Capacitance

<t>lets try to attack this from the back, since front side is too complex.<br/> I am not expert physicist, but probably this will not be problem.<br/> <br/> to start fusion you need to significantly decrease distance between atoms nuclei lets say about 1000 times. I believe fusion can happen even at...
by Digix
Wed Nov 28, 2007 11:05 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: A interesting model of quantum mechanics.
Replies: 15
Views: 4580

Re: A interesting model of quantum mechanics.

<t>Anyone can create some theory, and if it is simple enough and more or less reflects reality it's ok. <br/> Physic is not some kind of religion everyone have equal rights, final judge is experiment.<br/> <br/> unfortunately most physicists stick with something old that is proven to be wrong but st...