Search found 320 matches

by Rex Allers
Wed Sep 30, 2015 2:46 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: X-ray transformer modifications
Replies: 22
Views: 11328

Re: X-ray transformer modifications

I was waiting for someone with more real experience to pipe up, but it hasn't happened so I'll add what I'm thinking. The original design is basically two ~63 KV supplies relative to ground. One provides + HV and the other -HV. The xray tube is placed between them so it sees ~125 KV. The two ends of...
by Rex Allers
Fri Jul 17, 2015 11:19 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Board Mounted LiI(Eu) scintillators - repost in neutron detection
Replies: 26
Views: 21196

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

It doesn't change anything in the discussion, but I'm pretty sure ebay seller(s) "rockcodfred" and "kephis" is the same person. Not sure why the newer identity.
by Rex Allers
Thu Jul 16, 2015 12:45 pm
Forum: Images du Jour
Topic: Hello again after a long time... with pretty graphs.
Replies: 4
Views: 2327

Re: Hello again after a long time... with pretty graphs.

Wow. Thanks for sharing your great work.
by Rex Allers
Thu Jul 16, 2015 6:05 am
Forum: Images du Jour
Topic: Hello again after a long time... with pretty graphs.
Replies: 4
Views: 2327

Re: Hello again after a long time... with pretty graphs.

Nice post, Ben. I'm mostly a lurker here. When was your fusion achieved (~2009, 10)? Very nice to see a (young, I assume) fusor constructor go on to joining a team for serious scientific research. Congratulations on being accepted into that realm. On your post, the 3D gif graph with the "shadows" on...
by Rex Allers
Mon Jul 13, 2015 7:02 am
Forum: Images du Jour
Topic: Calling Frank Sanns - Network Switch
Replies: 2
Views: 1416

Re: Calling Frank Sanns - Network Switch

Many of the young people have no idea what it took to connect computers back in the day.
Some (not so young) do.

Image
by Rex Allers
Tue Jun 30, 2015 9:03 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Trouble Obtaining Deuterium
Replies: 10
Views: 5384

Re: Trouble Obtaining Deuterium

Well, that's an ugly development. I've been slowly accumulating parts to build a fusor, but I am getting closer. I don't like it, but I guess it isn't surprising that the govt is getting into the middle of this too. I was leaning toward electrolysis anyway but this thread just caused me to order 200...
by Rex Allers
Mon May 25, 2015 8:21 pm
Forum: Vacuum Technology (& FAQs)
Topic: Fixing an Analog Thermocouple Gauge
Replies: 11
Views: 7050

Re: Fixing an Analog Thermocouple Gauge

Charles, I agree with Bruce that you may have a vacuum issue, rather than a meter issue. Everything you have posted about the meter and tube sounds good. I have a Varian 0531 tube here, but no meter, and I have never tried to use it. Your post caused me to try to understand how the meter should work...
by Rex Allers
Sun May 24, 2015 8:29 am
Forum: Images du Jour
Topic: First Plasma Achieved
Replies: 5
Views: 2772

Re: First Plasma Achieved

John Futter wrote: I would think your vacuum in the chamber is around 0.1 millibar aka 2 x 10 to minus 1 torr.
John, Isn't 0.1 mbar = 0.075 Torr? Not critical to the general discussion, but what pressure did you actually think you were seeing in the plasma?
by Rex Allers
Sun May 24, 2015 7:20 am
Forum: Vacuum Technology (& FAQs)
Topic: Fixing an Analog Thermocouple Gauge
Replies: 11
Views: 7050

Re: Fixing an Analog Thermocouple Gauge

I don't have a lot of experience and thought someone else might chime in, but let me ask one thing. You said, "When plugged in the meter's needle moves from OFF to ATM, meaning it reads at some voltage but doesn't move from there." That sounds like proper operation. Have you connected it to a vacuum...
by Rex Allers
Tue May 12, 2015 10:12 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 5305

Re: TG-550 TC vac gauge tube

Thanks for the replies. I do have a copy of a Bell Jar article that gives some details on DV-6M, 531 and 6343. Good info and helpful overview. I also have a Teledyne Hastings table that gives pins, heater current and general parameters for 7 of their tubes. Maybe the phone calls are a good idea. In ...