Search found 10627 matches

by Richard Hull
Wed Feb 21, 2018 4:55 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Saving another PNC-1
Replies: 6
Views: 852

Re: Saving another PNC-1

Nice clean looking items. You either cleaned them to perfection or they had a happy life with people around them who cared. Many such instruments have an unhappy life with professionals who look upon them as mere tools like a hammer or screwdriver. As they age and better gear comes along they are re...
by Richard Hull
Tue Feb 20, 2018 10:11 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Saving another PNC-1
Replies: 6
Views: 852

Re: Saving another PNC-1

Jim's advice is sage. Corrosion in the battery pack contacts and around old solder joints is common. The most common failure is the HV supply, always an easy fix for an adroit hand. The PNC-1 is easily broken down into its components for easy elimination of modules and components one-by-one such tha...
by Richard Hull
Sat Feb 17, 2018 6:52 am
Forum: The Trading Post
Topic: Cute Ion source for vacuum chamber
Replies: 4
Views: 173

Re: Cute Ion source for vacuum chamber

Jerry, That was my feeling as well. Some special purpose system. They did silver plate the entire thing save for the flange with seems to be silver soldered SS. Regardless, they did a fine job on all the joints.

Richard Hull
by Richard Hull
Fri Feb 16, 2018 11:46 pm
Forum: The Trading Post
Topic: Cute Ion source for vacuum chamber
Replies: 4
Views: 173

Re: Cute Ion source for vacuum chamber

I have no idea where this source came from. I was told it was removed from a functioning system.

Base flange 3.0 inches diameter. Internal chamber 2.2 inches in diameter, From flange to top of HV insulator - 4.7 inches.

Richard Hull
by Richard Hull
Fri Feb 16, 2018 9:12 am
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 33
Views: 882

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

Looks like my system on fusor IV. Short connections, pump to TC gauge, fore line valve and Diff pump. You bought well. I wish others would start out this way. Pump down of the fore line should be near instantaneous. The diff pump will also be quick. My system can hit fore line plus the diff pump to ...
by Richard Hull
Fri Feb 16, 2018 8:55 am
Forum: The Trading Post
Topic: Cute Ion source for vacuum chamber
Replies: 4
Views: 173

Cute Ion source for vacuum chamber

I offer this for use as an ion source or a source for parts. This was removed from a vacuum system that needed ions, but not a focused gun source. This should do fine once a little cleaning and TLC in adapating is applied. It has an odd, (homemade), flange to attach it to the system. Approx 3 inches...
by Richard Hull
Thu Feb 15, 2018 7:54 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Bonding Tungsten and/or Iridium?
Replies: 27
Views: 1827

Re: Bonding Tungsten and/or Iridium?

Resistance welding is made very easy if capacitive discharge is used, as you just dial a voltage to get a rather precise joule energy in every weld. Professional machines for the vacuum tube industry usually had a selector switch to choose joule energy. My first resistance welder was a 10 volt 60 am...
by Richard Hull
Thu Feb 15, 2018 12:58 am
Forum: Images du Jour
Topic: Archived - Tom McCarthy's Fusor Efforts
Replies: 15
Views: 3787

Re: Archived - Tom McCarthy's Fusor Efforts

When you are finished and working, this will be a really sweet fusion system. Taking it slow and easy will allow for a system that has a far better chance of success out of the gate.

Richard Hull
by Richard Hull
Thu Feb 15, 2018 12:18 am
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - Joining metals - A critical fusor construction element
Replies: 1
Views: 143

FAQ - Joining metals - A critical fusor construction element

The following is a quick rinse in what methods are sometimes used to join metals in fusor construction. The mere assembly and joining of components to a fusor is just part of the big picture here. However you assemble and attach items to a fusor, it must also be vacuum tight and vacuum friendly. Thi...
by Richard Hull
Wed Feb 14, 2018 9:05 pm
Forum: Advanced Technical Discussion Area
Topic: Alternative Reactor Design
Replies: 15
Views: 3139

Re: Alternative Reactor Design

Thanks Daniel. A number of years ago Jon Rosenstiel experimented with a number of different grids even a solid ball and it did fusion! The grid design is not hyper critical. A needle point will do fusion just fine. Doug Coulter has used only a cylinder grid in his superb fusor for years. This is jus...