Search found 15 matches

by Tony Lai
Fri Sep 11, 2020 7:59 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Effectiveness of water (H2O) on fast neutrons?
Replies: 3
Views: 765

Effectiveness of water (H2O) on fast neutrons?

Hi there A bit of research shows me that water is a common material used for neutron shielding, and on some papers it actually does the job of slowing down fast neutrons well. So it arouses the question for me, is it possible to just stack a few of those brick-like large packaged drinking water (4-5...
by Tony Lai
Mon Sep 07, 2020 3:40 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Thank you Rich, Dennis and Bob for reiterating the safety issue. I would definitely prioritise the safety over anything. I know that it is simply daft to neglect the grounding of any electronics. I have never thought about the issue of killing electronics through the grounding circuit, just terrifie...
by Tony Lai
Sun Sep 06, 2020 10:54 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Thanks for your advice. I'm reluctant to be electrocuted so I will be wearing proper 35kv rated working glove, also I'll be using 40kv rated wires for wiring. For the grounding, put aside the roughing pump that I even planned to just rip the grounding wire from the three prone cables, I'm quite sure...
by Tony Lai
Sun Sep 06, 2020 11:00 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Thanks for your suggestion Dennis. I prefer the four diode bridge primarily due to the fact that I have purchased a bunch of those HV diodes anyway, but I'm concerning about the insulation problem as I plan to leave the circuit in air. It might be disastrous to figure out how to insulate that in air...
by Tony Lai
Sun Sep 06, 2020 7:01 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Thanks so much for help. I have finally finalised one viable schematic, and now I really have a understanding about my initial question, that is the difference between a 'two diode' and a 'four diode' rectifier. I was initially planning to connect all my electronics (vacuum pumps, controller, transf...
by Tony Lai
Sat Sep 05, 2020 2:16 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Now I can really see where the issue is, my insufficient electrical knowledge traumatised me so much. The core of the transformer is insulated and there is no point for connection, just two HV leads. It just feels so wrong that the circuit draws current from the ground although it seems fine to me a...
by Tony Lai
Fri Sep 04, 2020 11:03 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

I really appreciate all of your valueble opinions. Just done a double check with the transformer supplier that the transformer itself will be fine even if the consumer tries to draw those 30kv arcs across the secondary winding, now with that in mind I sort of have the confidence that HV winding won'...
by Tony Lai
Thu Sep 03, 2020 8:40 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

You must have a gang of 2020 money! Did you specify a secondary current capability? Very, very important. Is it a solid iron core or shunted? Did they wisely question why you demanded a single 30kv secondary? It will make them go nuts on the core and insulation requirements!! Did they state the wei...
by Tony Lai
Wed Sep 02, 2020 11:17 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Re: Questions about HV rectifier

Much better explanation Rich :) Tony, do you have a transformer already? I do have placed my order on a 30kv transformer several days ago. I ended up just calling up one of those industrial suppliers that produce transformers and ordered one conventional transformer that is really without any featu...
by Tony Lai
Tue Sep 01, 2020 10:29 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Questions about HV rectifier
Replies: 35
Views: 3872

Questions about HV rectifier

Hi, there I have noticed that the majority members of the community utilise the rectifier design of two diodes facing away from each other. However I have seen some people using a design of conventional full bridge rectifier, wiring the positive output to the ground. I'm a bit confused by the differ...