Search found 701 matches

by Andrew Seltzman
Wed Jan 02, 2019 6:54 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Anode layer ion source. Operation pictures
Replies: 62
Views: 27316

Re: Anode layer ion source. Operation pictures

A patent has been granted on the use of a keep alive electrode to decrease startup time:
http://pdfpiw.uspto.gov/.piw?PageNum=0& ... LRPgD8lPts
by Andrew Seltzman
Wed Dec 19, 2018 4:50 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: COMSOL simulation of a FUSOR?
Replies: 23
Views: 6179

Re: COMSOL simulation of a FUSOR?

I believe comsol does have a particle tracking module, but it has to be licensed and installed separately and is not part of the basic package.
by Andrew Seltzman
Sat Dec 15, 2018 4:18 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Deuterium Lecture bottle
Replies: 26
Views: 5178

Re: Deuterium Lecture bottle

I posted a writeup here: viewtopic.php?f=6&t=10336

You will have to have it shipped to a company or university, no one will ship to a residential address. Several members have had success having a welding supply store buy it and ship it to the store for pickup.
by Andrew Seltzman
Sat Dec 15, 2018 4:14 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to order Deuterium from Matheson to a University
Replies: 4
Views: 4159

Re: How to order Deuterium from Matheson to a University

Since there have been a few more posts on deuterium I'll also add the following about shipping from matheson: You can avoid having it sent via palletized freight if you specify "Ship from Joliet via Fedex overpack" on the order. It helps if you have a fedex account to charge this to. This way they w...
by Andrew Seltzman
Mon Dec 10, 2018 3:23 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Board Mounted LiI(Eu) scintillators - repost in neutron detection
Replies: 19
Views: 7121

Re: Board Mounted LiI(Eu) scintillators - repost in neutron detection

De potting of the scintillation assembly: I got a few of these detectors as freebees and decide to de-pot one: Tube assembly with back potting compound removed, fairly easy with a heat gun: IMG_20181209_183736124.jpg PMT de-potted, takes a little more effort, but still possible with a heatgun and fi...
by Andrew Seltzman
Mon Nov 19, 2018 12:53 am
Forum: Announcements and Site Administration Topics
Topic: Finished PhD, now a postdoc at MIT
Replies: 8
Views: 1031

Finished PhD, now a postdoc at MIT

For those of you who don't follow me on facebook, I finished my PhD in plasma physics last year where I demonstrated the first observation of RF heating in the reversed field pinch: My thesis: http://plasma.physics.wisc.edu/uploadedfiles/theses/thesisSeltzman132_2017.pdf A power point of a conferenc...
by Andrew Seltzman
Sun Nov 18, 2018 10:27 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Replies: 138
Views: 40842

Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA

The thermal camera is viewing the grid during operation, my grid is liquid cooled so it will remain at fairly low temperatures as long as there is coolant flow. There is a little EMI noise on the video, though I have not yet cleaned up the wiring and the video is being sent over twisted pair wire.
by Andrew Seltzman
Sun Nov 11, 2018 2:48 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Replies: 138
Views: 40842

Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA

The new CNC'd mounting plate for the internal vacuum pumps have arrived and the turbo and diaphragm pump are installed within the fusor frame. Diaphragm pump, turbo pump and MKS-901P gauge for roughing line pressure measurement are mounted on the aluminum plate. SAM_6860.JPG Plate mounts on top of f...
by Andrew Seltzman
Tue Oct 23, 2018 11:13 pm
Forum: New User Chat Area
Topic: Radio waves to increase fusion yield
Replies: 12
Views: 1739

Re: Radio waves to increase fusion yield

Yes, the window would be possible, however you would need to ensure the nipple the window is mounted on will transmit the RF frequency. The nipple would act as a cylindrical waveguide, the cutoff frequency, determined by radius would have to be below your operating frequency (it should be below by s...
by Andrew Seltzman
Wed Oct 17, 2018 4:38 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA
Replies: 138
Views: 40842

Re: Mark3 operation 3e-4 torr / quad ion source @ -40kV, 1mA-9mA

More upgrades for the fusor: Upgrades for mounting internal vacuum pumps, custom backing and mounting bracket for the TPD011 turbo pump SAM_6850.JPG Front and back of bracket, replaces the NW16 backing connector and provides 4x 10-32 tapped threads on a 1.75"x97mm pattern SAM_6849.JPG Turbo pump and...