Search found 222 matches

by Dan Knapp
Thu Dec 05, 2019 9:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 7
Views: 460

Amptek Digital Pulse Processor

There is a good deal available on eBay on current generation Amptek digital pulse processor boards. These are the Amptek DP5/PC5 board combination (see Amptek.com). The DP5 includes an analog prefilter, an ADC, a digital pulse processor and a multichannel analyzer. It is designed to accept a radiati...
by Dan Knapp
Thu Dec 05, 2019 9:52 pm
Forum: FAQs: Vacuum Technology
Topic: FAQ - Sealing a conflat flange and flanges in multiples
Replies: 10
Views: 351

Re: FAQ - Sealing a conflat flange and flanges in multiples

You want the knife edges to dig into the copper to make a seal, but you don't have to do it fully the first time. The manufacturers would have you tighten flanges on a new gasket until the flange faces touch, but you can make a good seal with less compression. The key is to tighten sequentially in a...
by Dan Knapp
Tue Dec 03, 2019 10:07 pm
Forum: FAQs: Vacuum Technology
Topic: FAQ - Sealing a conflat flange and flanges in multiples
Replies: 10
Views: 351

Re: FAQ - Sealing a conflat flange and flanges in multiples

I typically operate my system at the low end of the 10-7 Torr range and still get 5-6 uses from each gasket by careful tightening.
by Dan Knapp
Tue Dec 03, 2019 12:42 pm
Forum: FAQs: Vacuum Technology
Topic: FAQ - Sealing a conflat flange and flanges in multiples
Replies: 10
Views: 351

Re: FAQ - Sealing a conflat flange and flanges in multiples

I agree with Richard on tightening conflat flanges. I’ve been using conflats for nearly fifty years, and early on my frugality led me to squeeze as much life as possible out of the copper gaskets. I typically get 5-6 uses out of a gasket (i.e. opening and resealing). I put a little sticker on each f...
by Dan Knapp
Sun Oct 20, 2019 11:35 am
Forum: Announcements and Site Administration Topics
Topic: Almost all the FAQs are broken
Replies: 11
Views: 669

Re: Almost all the FAQs are broken

I can see the FAQ’s, but the links to attachments are broken.
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: 1535

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: 1535

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: 19
Views: 1740

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: 1302

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: 1086

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...