Search found 285 matches

by Dan Knapp
Tue Jan 14, 2020 10:05 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 1646

Re: Increasing use of cylindrical fusors

The reports from the Kyoto group of greatly enhanced neutron production were for a titanium anode. In more recent work with a cylindrical fusor, they also used a titanium cathode, but it was a tubular cathode and not a wire grid.. A titanium wire grid cathode would definitely be expected to outgas w...
by Dan Knapp
Tue Jan 14, 2020 5:00 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Discriminating neutron peaks from electrical noise peaks
Replies: 3
Views: 782

Re: Discriminating neutron peaks from electrical noise peaks

Richard, do you know a specific model number NIM module that will do pulse width detection? I am not familiar with one that has this specific function.
by Dan Knapp
Mon Jan 13, 2020 6:51 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Discriminating neutron peaks from electrical noise peaks
Replies: 3
Views: 782

Discriminating neutron peaks from electrical noise peaks

As discussed here previously, and in my own experience as well, counting neutrons using a Helium-3 detector is fraught with difficulty due to electrical pulses from arcing in a fusor. There are sophisticated methods to do peak discrimination, but I just came across a clever solution that makes use o...
by Dan Knapp
Sun Jan 12, 2020 10:11 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 1646

Increasing use of cylindrical fusors

The 21st US-Japan Workshop on Fusion Neutron Sources and Applications (formerly called Workshop on IEC Fusion) was held last month in Kyoto. Unfortunately, I did not attend; but I did see the list of presentations. Most notable to me was an increasing shift from spherical devices to linear devices b...
by Dan Knapp
Mon Dec 30, 2019 9:47 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 13
Views: 2281

Re: Amptek Digital Pulse Processor

With the holiday past, I've been able to turn my attention back to my DP5/PC5. Unfortunately, I did not print the responses that were lost on this thread, which addressed issues of powering the boards. Mine will not power up from the USB connection, either with or without the PC5 attached. My intent...
by Dan Knapp
Sat Dec 28, 2019 7:51 am
Forum: Items wanted
Topic: 60 kV Cable, any gauge
Replies: 11
Views: 1295

Re: 60 kV Cable, any gauge

For high voltage use of RG213, in regard to removing the shield at the end, it is good practice to reduce the field gradient between the cut end of the shield and the inner conductor by putting an o-ring over the shield and then folding the cut end of the shield back over the o-ring. This is somewha...
by Dan Knapp
Fri Dec 27, 2019 12:11 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 13
Views: 2281

Re: Amptek Digital Pulse Processor

There were some posts to this thread lost. It would be nice if those posting have saved copies they could repost.
by Dan Knapp
Thu Dec 05, 2019 9:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 13
Views: 2281

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: 1656

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: 1656

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.