Search found 71 matches

by Erik smith
Mon Jun 01, 2020 7:37 pm
Forum: Items For Sale
Topic: X-ray Transformers For Sale
Replies: 0
Views: 390

X-ray Transformers For Sale

I have two of these transformers available. They are both 100 kV XRTs. DO NOT PURCHASE IF NEW TO HIGH VOLTAGE!

Ebay listing:
https://www.ebay.com/itm/x-ray-transfor ... SwlEZe1VXb

IMG_0976.jpg
by Erik smith
Mon Jul 23, 2018 2:45 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: RF excited ion sources
Replies: 10
Views: 15373

Re: RF excited ion sources

Werner, what did you use for impedance matching network?
by Erik smith
Fri May 25, 2018 1:57 am
Forum: Images du Jour
Topic: Neutron Club Application - Erik Smith
Replies: 5
Views: 3093

Re: Neutron Club Application - Erik Smith

Ryan,

I have gotten three 30kV high voltage feedthrough from eBay, all under $90 each.
by Erik smith
Fri Apr 27, 2018 11:50 pm
Forum: Images du Jour
Topic: Neutron Club Application - Erik Smith
Replies: 5
Views: 3093

Neutron Club Application - Erik Smith

Over the past few months, my fusor has been sitting in the basement of the Nuclear Engineering lab at the University of Illinois. After several months of fiddling with the chamber, I finally decided to go for a fusion run. Neutron Run: Pressure: 52mtorr Voltage: 30kV Current: 4.7mA Run Duration: ~2 ...
by Erik smith
Tue Mar 20, 2018 9:58 pm
Forum: Vacuum Technology (& FAQs)
Topic: Alcatel Vacuum Pump Teardown
Replies: 2
Views: 2079

Alcatel Vacuum Pump Teardown

I have an Alcatel 2002BB vacuum pump that I bought online last year. I quickly found out, after deadheading it with a TC vacuum gauge that it only pulls a vacuum of 2 Torr! I decided to open the pump and look around for what could possibly be the source of this horrible vacuum. However, I did not fi...
by Erik smith
Sun Jan 07, 2018 4:33 pm
Forum: Vacuum Technology (& FAQs)
Topic: Severe Outgassing Problems
Replies: 7
Views: 2952

Re: Severe Outgassing Problems

Robert, I have seen several people (on this forum and in person) use acetone and IPA without any problems. The type of IPA i'm using is 99.9% pure anhydrous so I don't think water is the issue. Ian, Yes I do notice this problem when doing external bakeouts as the larger stainless steel pieces tend t...
by Erik smith
Sun Jan 07, 2018 2:46 am
Forum: Vacuum Technology (& FAQs)
Topic: Severe Outgassing Problems
Replies: 7
Views: 2952

Severe Outgassing Problems

When I first started using my vacuum chamber I noticed the "leak rate" would essentially vary when I isolated the chamber from my vacuum pumps using a right angle bellows valve. I figured it was outgassing when I noticed that my pressure increase would depend on how long I pumped my chamber for. Wit...
by Erik smith
Thu Dec 28, 2017 5:47 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: RF Power Supply for ICP Purposes
Replies: 13
Views: 10749

Re: RF Power Supply for ICP Purposes

Ian, Make a 1dB attenuator to put on the output - you lose 20% of your output at the gain of not blowing the devices This immediately means the VSWR can not go over 8.7:1 with a dead short or open on the output (the two worst possible cases) 8.71:1 indicates the maximum VSWR the amplifier can see wi...
by Erik smith
Thu Dec 28, 2017 5:02 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: RF Power Supply for ICP Purposes
Replies: 13
Views: 10749

Re: RF Power Supply for ICP Purposes

I have seen a lot of RF attenuators on ebay and Ali Express. My only concern is the very low VSWR (~1.2:1) rating for most of the 1dB attenuators widely availabel. https://www.aliexpress.com/item/100W-N-type-RF-coaxial-fixed-attenuator-3db-DC-3Ghz-free-shopping/32673692558.html https://i.ebayimg.com...
by Erik smith
Thu Dec 28, 2017 12:22 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: RF Power Supply for ICP Purposes
Replies: 13
Views: 10749

Re: RF Power Supply for ICP Purposes

Richard, here is a link to a supplier of the transistors used in the amplifier. Looking on other forums. They seem to be very hard to replace. https://www.rfparts.com/rftransistors/transistor-misc/transistor-misc-pt/pt9784.html I have also seen multiple posts on how to modify cheap amplifiers found ...