Search found 320 matches

by Tom McCarthy
Tue Oct 09, 2018 3:27 pm
Forum: Images du Jour
Topic: Archived - Tom McCarthy's Fusor Efforts
Replies: 21
Views: 12621

Re: Archived - Tom McCarthy's Fusor Efforts

Thanks Dennis, appreciate the advice. I'm finding it harder than expected to operate the Fusor, haven't achieved a stable plasma at high voltages yet. I don't think I've got a stable deuterium plasma yet, as my D2 flow is too constricted, and I can't seem to throttle my turbo pump enough. The turbo ...
by Tom McCarthy
Mon Sep 17, 2018 2:06 pm
Forum: Images du Jour
Topic: Archived - Tom McCarthy's Fusor Efforts
Replies: 21
Views: 12621

Re: Archived - Tom McCarthy's Fusor Efforts

I achieved plasma this weekend, on a run less than a minute long. It followed from wiring up and testing my high voltage line and supply. The high voltage line consists of: a DIY connector for the Matsusada supply RG213 coax 100k, 100W resistor immersed in motor oil grounding lugs/wires Feedthrough ...
by Tom McCarthy
Fri Jul 06, 2018 8:52 pm
Forum: Books & References
Topic: Answer keys w/ explanation?
Replies: 19
Views: 8405

Re: Answer keys w/ explanation?

It can be a lot of fun and rewarding (and tough!) to learn the theory behind the actual device we build. However, I wouldn't get too caught up in learning theory before actually making something. My Fusor isn't done yet, but one thing I'd do differently would be to get to work with my hands quicker,...
by Tom McCarthy
Fri Jul 06, 2018 8:39 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: WA6-30N High Voltage Enable
Replies: 2
Views: 2459

Re: WA6-30N High Voltage Enable

Good catch, thanks John. I've now got the power supply working as far as I can tell - HV status light switches on and off as expected, voltage readout reads 0-10v on my led meter, changing as I turn appropriately connected potentiometer. Progress!
by Tom McCarthy
Thu Jul 05, 2018 1:11 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: WA6-30N High Voltage Enable
Replies: 2
Views: 2459

WA6-30N High Voltage Enable

Have been working on getting my 30kv/20ma power supply working. It's a Matsusada unit, all controlled via a fairly simple I/O. Datasheet is attached. My first step has been trying to get the HV status pin to LO, which means HV ON. As far as I can tell from the datasheet, this only requires shorting ...
by Tom McCarthy
Tue Jun 05, 2018 9:54 am
Forum: Vacuum Technology (& FAQs)
Topic: Foreline pump base pressure degraded
Replies: 10
Views: 4342

Re: Foreline pump base pressure degraded

The first part of your message gave me a shock Richard, relieved to see the caveat for forepumps. My standard procedure when finished pumping and using the system is to first turn off the turbo pump. I leave the mechanical forepump running. After an hour or so I look for a noticeable rise in pressur...
by Tom McCarthy
Sun May 27, 2018 9:14 pm
Forum: Images du Jour
Topic: Archived - Tom McCarthy's Fusor Efforts
Replies: 21
Views: 12621

Re: Archived - Tom McCarthy's Fusor Efforts

I just finished leak testing my gas line and it’s in place now. Dad and I put together the clamp arrangement that holds the D2 lecture bottle in place. He welded it, as I have next to no welding experience. My next step is to complete my RG58 HV cable, and connect my power supply to ballast resistor...
by Tom McCarthy
Tue May 08, 2018 9:11 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: From Humble Fusor Beginnings
Replies: 4
Views: 4331

Re: From Humble Fusor Beginnings

Wholly agree with Nck's sentiment that the wealth of information, advice and discourse on the forum have guided my own path so far. I'm in my last year of secondary school, and plan on starting an undergrad in physics, and will be working in a quantum computing lab in University College London this ...
by Tom McCarthy
Mon Apr 30, 2018 12:32 pm
Forum: Vacuum Technology (& FAQs)
Topic: NT150/360 Problem
Replies: 9
Views: 3409

Re: NT150/360 Problem

Vacuum company fixed the controller thankfully. John, think you were right, it was a power transistor.
by Tom McCarthy
Tue Apr 24, 2018 8:00 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Reactor Update - 4/22/18
Replies: 6
Views: 5950

Re: Reactor Update - 4/22/18

Looks great. I like the chassis and panel, nice upgrades.