Search found 71 matches

by Finn Hammer
Thu Nov 02, 2017 3:14 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Tensioned Metastable Fluid Detector (TMFD)
Replies: 18
Views: 5277

Re: Tensioned Metastable Fluid Detector (TMFD)

Dan Knapp wrote:
Wed Nov 01, 2017 8:16 pm
The following paper is available online:
http://www.taka.qst.go.jp/tokai_center/ ... Ohgaki.pdf
Dan,

Thank you, for taking the time to dig out this PDF. I appreciate it.

Cheers, Finn Hammer
by Finn Hammer
Wed Nov 01, 2017 9:09 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Tensioned Metastable Fluid Detector (TMFD)
Replies: 18
Views: 5277

Re: Tensioned Metastable Fluid Detector (TMFD)

The TMFD shown at the meeting is being used by Kai Masuda’s group at Kyoto University in a detection system for “special nuclear materials” being developed for the Tokyo Olympic Games. They are using a portable fusor with a 17 cm diameter water cooled chamber operated at 120 kV to generate 5 X 10e7...
by Finn Hammer
Wed Nov 01, 2017 6:56 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Anode layer ion source. Operation pictures
Replies: 70
Views: 69909

Re: Anode layer ion source. Operation pictures

Andrew,
Please excuse my presence in this very advanced thread, but I have been looking for an opportunity, for a while, to ask why the anode was supported by only 3 screws, leaving the 4th. hole vacant.
I guess this post answers that.

Cheers, Finn Hammer
by Finn Hammer
Mon Oct 30, 2017 10:54 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator power supplies?
Replies: 29
Views: 10107

Re: Precipitator power supplies?

Shireesh, For your consideration, here is an image of the voltage divider I use for my high voltage work. It is shown hooked up to another Precipitator supply that I am evaluating for a precipitator project I am associated to. It is a 20.000 : 1 divider. The high voltage resistors are 1% 20Mohms, 10...
by Finn Hammer
Sun Oct 29, 2017 9:19 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Deuterium Accelerator and Electro-Static Power Supply
Replies: 18
Views: 12895

Re: Deuterium Accelerator and Electro-Static Power Supply

Dennis, Great news on the corona issue. The Habasit site looks like a dead end to me, it looks like the company has folded, and is just holding on to the URL for future reasons. Just plain impossible to get to a place where you can place an order, or even get material descriptions. Come to think of ...
by Finn Hammer
Sun Oct 29, 2017 1:13 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Deuterium Accelerator and Electro-Static Power Supply
Replies: 18
Views: 12895

Re: Deuterium Accelerator and Electro-Static Power Supply

Dennis, Sorry to hear you missed the corona at the tip of the needles. I was wondering about the possible difference between the 60Hz you are using, and the 24kHz that I am using, but thought better about mentioning it beforehand. It shouldn't really matter, since the supply is rectified, but who kn...
by Finn Hammer
Sun Oct 29, 2017 7:32 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Precipitator power supplies?
Replies: 29
Views: 10107

Re: Precipitator power supplies?

Gods speed to you, for testing this supply. Those of us who has had access to better supplies like Spellman et al will tend to disbelieve the suitability of it, with regard to delivering, in particular, the voltage. I doubt it too, due to experience with similar supplies, where corona issues, and tr...
by Finn Hammer
Sat Oct 28, 2017 9:44 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Deuterium Accelerator and Electro-Static Power Supply
Replies: 18
Views: 12895

Re: Deuterium Accelerator and Electro-Static Power Supply

I will have to look it up, It is a transport belt used in the food industry, you know, to get the cookies and bisquits from the oven to the packing machine. The company that produces it is called Habasit and the product number is F-2EQWT. Not sure they are in business anymore. But any thin polyureth...
by Finn Hammer
Sat Oct 28, 2017 9:19 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Deuterium Accelerator and Electro-Static Power Supply
Replies: 18
Views: 12895

Re: Deuterium Accelerator and Electro-Static Power Supply

Dennis, Sounds good. With 150Mohm in series, you will be good. I hope you will get a dark night, where you can see the corona on the tips of the comb. I wonder how the silver paint on your belt is going to influence the operation, but am very interested in hearing about your observation of the coron...
by Finn Hammer
Thu Oct 26, 2017 7:40 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Deuterium Accelerator and Electro-Static Power Supply
Replies: 18
Views: 12895

Re: Deuterium Accelerator and Electro-Static Power Supply

The good news for me, in any case, is that if the HVM can't directly charge my accelerator's sphere, it can certainly be used to charge my Van de Graaff's belt with a well over 50 kV or so positive charge (at the base of the VdG's belt); SNIP If my direct charging of the accelerator fails via the H...