Search found 151 matches

by Scott Moroch
Fri Sep 04, 2020 9:23 pm
Forum: Vacuum Technology (& FAQs)
Topic: Who has the largest chamber? Any pics?
Replies: 6
Views: 600

Re: Who has the largest chamber? Any pics?

The fusor built by myself, Tim Koeth, Jay Howson and Jim Krutzler uses a ~28" diameter spherical chamber.

We use a small turbo pump (50 l/s I think, I will have to check). It reaches low E-7.

-Scott
by Scott Moroch
Sun Apr 05, 2020 11:26 pm
Forum: Images du Jour
Topic: Liquid cooled Demo Fusor cage
Replies: 4
Views: 829

Re: Liquid cooled Demo Fusor cage

Nice! Stick with it. My friend and I spent ~1.5-2 years messing around with a demo fusor before we really got things moving on a real, neutron producing fusor.

These two pictures I attached were taken approximately 7 years apart.
by Scott Moroch
Sun Apr 05, 2020 12:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V construction - the process long running
Replies: 48
Views: 15542

Re: Fusor V construction - the process long running

I am curious why the tungsten needle in your ion source is at a negative bias with respect to the shell? I would also suggest a single hole or group of holes around the center axis, rather than many perforations. I have attached a picture of a successful deuterium ion source I have built. 1.2 kV acr...
by Scott Moroch
Wed Apr 01, 2020 8:54 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Help using Canberra 8701 ADC for MCA and *more* Neutron Issues
Replies: 6
Views: 1126

Re: Help using Canberra 8701 ADC for MCA and *more* Neutron Issues

Luke, I am not familiar with the Canberra units, but my friend Jay Howson is. Below is a writeup he did on our website of how he made use of the Canberra modules for spectroscopy: http://www.nuclearphysicslab.com/npl/npl-home/spectroscopy/software_and_hardware/diy-canberra-system/ Sorry if this does...
by Scott Moroch
Sat Mar 28, 2020 4:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V construction - the process long running
Replies: 48
Views: 15542

Re: Fusor V construction - the process long running

Robert,

It is likely a rotatable conflat. He will have to insert the inner SS ring with the knife edge. It looks like the feedthrough is welded or Silver Soldered to the outer SS ring. Look at the picture I attached for reference.

Scott
by Scott Moroch
Sun Mar 22, 2020 5:30 pm
Forum: Interesting Links
Topic: "Nuclear Physics Lab" Website
Replies: 4
Views: 921

"Nuclear Physics Lab" Website

Hi everyone, Over the past few weeks our amateur science group (Tim Koeth, Jim Krutzler, Jay Howson, Brian Beaudoin, Miriam Hiebert, Luke Gilde, and myself) have assembled a website which details all of our projects. It is still a work in progress (and will continue to be), but a lot of content has ...
by Scott Moroch
Wed Mar 11, 2020 2:49 am
Forum: Vacuum Technology (& FAQs)
Topic: McMaster Carr's oddly inexpensive turbopump
Replies: 7
Views: 1340

Re: McMaster Carr's oddly inexpensive turbopump

Ian,
A brand new Pfeiffer Pumping station is $500 cheaper than the Mcmaster listing on IdealVac: https://www.idealvac.com/NEW-Pfeiffer-H ... pp/P107317

Still not affordable for the amateur, but available nonetheless.

Scott
by Scott Moroch
Sat Dec 14, 2019 3:09 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V Chamber
Replies: 20
Views: 7646

Re: Fusor V Chamber

I am by no means disagreeing with the statement: would "devour Deuterium like a vacuum cleaner." However, it is worth noting that larger systems maintain star mode at lower pressures. The fusor Tim Koeth and I built (larger than that chamber) maintains star mode between 2-4 mTorr. My 9" spherical ch...
by Scott Moroch
Wed Dec 11, 2019 12:42 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2790

Re: 30keV Deuteron Source

Roberto, To your first question: yes, the bottom of the glass tube is the gas inlet Second question: Yes, I have read about those ratios. The spacing was increased for that photo to demonstrate variability. Ultimately the spacing will be based on a SIMION model I have built of the entire beam line. ...
by Scott Moroch
Sat Dec 07, 2019 6:22 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2790

Re: 30keV Deuteron Source

Ian,

The ceramic on the Einzel Lens is Macor. The first and third electrodes of the lens are grounded and the middle is at a positive potential (400-1kV depending on desired focal length).

Scott