Search found 217 matches

by Dan Knapp
Mon Oct 14, 2019 1:18 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Non-Corrosive and/or Dielectric Liquid Cooling?
Replies: 16
Views: 337

Re: Non-Corrosive and/or Dielectric Liquid Cooling?

I think it’s generally agreed that the fluorinert fluids are environmentally unfriendly, but they are used in such small amounts that it is also generally agreed that they are not a significant problem. I think their astronomical cost will insure that they are never used in sufficient quantity to co...
by Dan Knapp
Sun Oct 13, 2019 11:24 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Non-Corrosive and/or Dielectric Liquid Cooling?
Replies: 16
Views: 337

Re: Non-Corrosive and/or Dielectric Liquid Cooling?

Behlke (Behlke.com) uses a sealed closed loop fluorinated fluid system to cool and insulate their HV pulse switches. They use a pump which is sold for cooling computer CPU’s. There are a large number of different pumps sold for this purpose largely to the high performance gaming community. This woul...
by Dan Knapp
Mon Oct 07, 2019 9:10 pm
Forum: Images du Jour
Topic: HEAS 2019 photos of the event
Replies: 11
Views: 742

Re: HEAS 2019 photos of the event

I tried to upload some short video clips of the plasma tube demonstrations, but the file sizes were too large even for clips of a few seconds.
by Dan Knapp
Fri Oct 04, 2019 1:39 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Diy Neutron detector tube
Replies: 11
Views: 639

Re: Diy Neutron detector tube

I admire your drive, but drive must be tempered by reality. I read your link to the source for isotope enriched boron trifluoride. That this material is commercially available is not a surprise, but I would be willing to bet: 1. It will boggle your mind what this material sells for, and 2. Even if y...
by Dan Knapp
Sun Sep 29, 2019 4:25 pm
Forum: Fusion --- Past, Present, and Future
Topic: Video of early Soviet fusion efforts. Rare footage
Replies: 7
Views: 747

Re: Video of early Soviet fusion efforts. Rare footage

Science is iterative. The first tokamaks were small, but they were a quantum leap in confinement at the time. GOLEM/CASTOR/TM-1 has a toroid not much more than a meter diameter. As more was learned about confinement, it was realized that larger and larger machines would be required. The Europeans in...
by Dan Knapp
Sat Sep 28, 2019 9:49 am
Forum: Fusion --- Past, Present, and Future
Topic: Video of early Soviet fusion efforts. Rare footage
Replies: 7
Views: 747

Re: Video of early Soviet fusion efforts. Rare footage

Very interesting video; thanks for posting. The video shows the Soviet tokamak 3. This brings to mind that its predecessor, TM-1, is still operating in Prague. It was first moved to the Czech Institute for Plasma Physics and renamed CASTOR. It was subsequently replaced there by a larger machine and ...
by Dan Knapp
Sat Sep 28, 2019 9:23 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection with plastic scintillator
Replies: 1
Views: 252

Neutron detection with plastic scintillator

Shumlak’s group at the University of Washington have been using an array of plastic scintillation detectors to detect neutrons in their sheared z-pinch experiment. A paper on the detector has just been posted online (https://authors.elsevier.com/c/1ZnJdcPqbanWj) in Nuclear Instruments and Methods A....
by Dan Knapp
Fri Aug 09, 2019 1:44 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Interest in RGAs (possibly a candidate for an FAQ?)
Replies: 18
Views: 3463

Re: Interest in RGAs (possibly a candidate for an FAQ?)

Roberto, are you referring to continuous dynode or discrete dynode multipliers. I have successfully rejuvenated discrete dynode (beryllium copper) multipliers by a variation of the method you describe, but not channeltrons. For discrete dynode multipliers, the process is essentially a cleaning. Inde...
by Dan Knapp
Thu Aug 08, 2019 11:28 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Interest in RGAs (possibly a candidate for an FAQ?)
Replies: 18
Views: 3463

Re: Interest in RGAs (possibly a candidate for an FAQ?)

In regard to the EM discussion, I think an EM will be required for a home built ion trap RGA. I don’t think one could get enough ion current out of the trap to detect with just a Faraday cup. There have been reports of rejuvenating continuous dynode multipliers (e.g. Channeltrons), but I was never s...
by Dan Knapp
Wed Aug 07, 2019 11:05 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Interest in RGAs (possibly a candidate for an FAQ?)
Replies: 18
Views: 3463

Re: Interest in RGAs (possibly a candidate for an FAQ?)

The original publication is: An electrostatic autoresonant ion trap mass spectrometer A. V. Ermakov, and B. J. Hinch Review of Scientific Instruments 81, 013107 (2010); https://doi.org/10.1063/1.3276686 It includes the circuit diagrams. The Kimball Physics eV parts are indeed quite expensive. An ama...