Search found 211 matches

by Jeroen Vriesman
Wed Jul 06, 2011 9:38 am
Forum: Vacuum Technology (& FAQs)
Topic: quadrupole failure
Replies: 10
Views: 2832

Re: quadrupole failure

I will try that.
There is no electron multiplier.

Should I try this with the filament on?
by Jeroen Vriesman
Wed Jul 06, 2011 8:44 am
Forum: Vacuum Technology (& FAQs)
Topic: quadrupole failure
Replies: 10
Views: 2832

quadrupole failure

<t>I have a problem with a quadrupole mass spectrometer, hope I can find some help here.<br/> <br/> It's a QMG 064, and it worked fine, after calibration the difference in total pressure measurement with my cold cathode was never more than about 30%, and the sum of the partial pressures was comparab...
by Jeroen Vriesman
Tue Jun 28, 2011 8:30 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV circuit protection.
Replies: 8
Views: 3535

Re: HV circuit protection.

<t>You might be able to limit the voltage using VDR's on the high voltage side.<br/> <br/> e.g. 3x V751HA40 in series would limit the voltage to approx. 3kV (wild guess, depends on your output current), these VDR's can handle some power and peaks without breaking down. (datasheet attached)<br/> <br/...
by Jeroen Vriesman
Mon Jun 27, 2011 8:17 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV circuit protection.
Replies: 8
Views: 3535

Re: HV circuit protection.

<t>Might be an oscillation making the spark-gap "go wild".<br/> <br/> Besides that, reversing a 1N400X, using it as a kind of zener is not a good idea, the reverse breakdown voltage is not specified, you only know the minimum, and it changes with temperature and aging.<br/> <br/> That is also the re...
by Jeroen Vriesman
Thu Jun 23, 2011 11:07 am
Forum: Vacuum Technology (& FAQs)
Topic: Chamber construction...what about nickel plating?
Replies: 7
Views: 3250

Re: Chamber construction...what about nickel plating?

Electrolytic polishing might be more useful.
I am also using two big rotary valves to make a vacuum chamber, about the same size, and I think it's AK steel 400.
Do you have a picture?
by Jeroen Vriesman
Thu May 26, 2011 11:15 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron dose - allowable
Replies: 10
Views: 5173

Re: Neutron dose - allowable

<r><URL url="http://www.fas.org/nuke/intro/nuke/radiation.htm">http://www.fas.org/nuke/intro/nuke/radiation.htm</URL><br/> <br/> but that's just the effect of a blast.<br/> There is also activation by neutrons of nuclei in your body which could have a long term effect.<br/> <br/> Are you building a ...
by Jeroen Vriesman
Wed May 25, 2011 7:32 am
Forum: Vacuum Technology (& FAQs)
Topic: GFCI Tripping
Replies: 12
Views: 3084

Re: GFCI Tripping

another idea, maybe there is something else in your shed already leaking something to ground?
Things like washing machines, dryers, other tools.
Did you try your fusor with everything else disconnected?
by Jeroen Vriesman
Wed May 25, 2011 7:14 am
Forum: Vacuum Technology (& FAQs)
Topic: GFCI Tripping
Replies: 12
Views: 3084

Re: GFCI Tripping

Maybe the ground fault circuit interruptor is different for that group?
by Jeroen Vriesman
Mon May 23, 2011 8:48 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to make fusion chamber?
Replies: 23
Views: 4906

Re: How to make fusion chamber?

It was just a test run for testing the cooling water pump.

I'm not building a standard fusor and I need much better than E-6 mbar.
The pump is a THP270, and I will (eventually... it's a lot of work) do bakeout at 180 C.
by Jeroen Vriesman
Mon May 23, 2011 7:31 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: First Bubbles!
Replies: 16
Views: 6701

Re: First Bubbles!

fantastic!

you are planning to make a superconducting polywell wow.