Search found 142 matches

by Liam David
Sun May 03, 2020 12:55 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 7
Views: 1671

Re: Building an Inexpensive HV Feedthrough: The Complete Saga

As I mentioned in the original post, the metal component is a standard 2.75" conflat to 0.75" or 1" quick-disconnect adapter. An o-ring seals the outside of the alumina or glass tube to the fitting and is compressed with the nut on the fitting. These are all Ebay finds or from other surplus websites...
by Liam David
Thu Feb 20, 2020 1:35 pm
Forum: Images du Jour
Topic: Dallas Maker Space setup progresses
Replies: 6
Views: 1655

Re: Dallas Maker Space setup progresses

Ion/electron beams did this to my viewport:

IMG_20190713_160425.jpg

I'd hate to see that happen to a bell jar under vacuum.
by Liam David
Fri Jan 31, 2020 1:45 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Newbie construction of chamber
Replies: 7
Views: 1036

Re: Newbie construction of chamber

We just get many one-timers who do no more than add to the membership count. Not trying to scare you off and certainly keep the enthusiasm. Welcome to the forums!
by Liam David
Thu Jan 30, 2020 11:30 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Newbie construction of chamber
Replies: 7
Views: 1036

Re: Newbie construction of chamber

"Construction / Technical Do not post simple questions here . Use the New User Chat area" is the header of this section of the forums. You haven't written an introductory post in the appropriate section and need to correct this. All your questions have been answered numerous times in the forums and ...
by Liam David
Thu Jan 30, 2020 5:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 7
Views: 1671

Re: Building an Inexpensive HV Feedthrough: The Complete Saga

Thanks for the compliments. Hopefully the design will get someone out of a rut. I absolutely agree that motivation is the key here. My journey from this (late 2013, early 2014): 2014-01-24.jpg to achieving fusion (summer 2019) was quite a rocky experience. Failures included: - Noise pickup by the ne...
by Liam David
Wed Jan 29, 2020 4:57 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Building an Inexpensive HV Feedthrough: The Complete Saga
Replies: 7
Views: 1671

Building an Inexpensive HV Feedthrough: The Complete Saga

Obtaining a suitable HV feedthrough was one of the main challenges I faced while building my fusor. I can remember multiple instances of 30kV feedthroughs showing up on Ebay over the last ~7 years, but those moments are few and far between. This post will chronicle my attempts at building an HV feed...
by Liam David
Sun Jan 12, 2020 2:27 am
Forum: Items For Sale
Topic: Rich Feldman's store. Today's feature: beryllium sheet
Replies: 9
Views: 1663

Re: Rich Feldman's store. Today's feature: beryllium sheet

I'd be interested in a 1x2 piece, and perhaps a graphite rod.
Thanks!
by Liam David
Sun Sep 08, 2019 3:03 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding
Replies: 10
Views: 6603

Re: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding

Richard, I cannot create a post in the FAQ sections. The button is not there. If I could I would have done so.
by Liam David
Sat Sep 07, 2019 8:20 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding
Replies: 10
Views: 6603

Re: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding

Alex, you are absolutely correct in the thermal peak being around 9-10cm. My mistake in reading the graph. If I had editing rights it would be fixed. I did attempt to follow the latest instructions regarding the cross-section data but for reasons unknown the commands failed. In step 4 I did include ...
by Liam David
Sat Aug 31, 2019 11:42 pm
Forum: FAQs: Neutron - Radiation Detection
Topic: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding
Replies: 10
Views: 6603

Re: FAQ - Neutron Transport Simulation, Detector Calibration, and Shielding

Cosmic neutrons are indeed a "does my detector work?" discriminator, though with the high variability due to probability (~sqrtN), altitude, latitude, the sun doing it's stuff, I doubt it's more useful than that. You'd need a minimum of several hours of data collection, and even then, I doubt you'd ...