Search found 1539 matches

by Dennis P Brown
Wed Nov 14, 2018 7:51 pm
Forum: The Trading Post
Topic: Wanted: Roughing Pump
Replies: 3
Views: 197

Re: Wanted: Roughing Pump

Just did a simple search for a "Two stage vacuum pump" and found a few usable pumps for under $500; one was even tested for under 6 microns. The seller gave a 30 day return policy, too. Are you searching using correct terminology?
by Dennis P Brown
Tue Nov 13, 2018 1:35 pm
Forum: Please Introduce Yourself
Topic: Hello from Panama
Replies: 1
Views: 124

Re: Hello from Panama

Glad you are trying to join the plasma club. Relative to some of your needs, I used a stainless steel welding rod for my inner grid; using a metal tube as a guide, I bent the rod around it a few times. Then using a vice to hold one of these loops, then using vice grips bent the others to be at vario...
by Dennis P Brown
Mon Nov 12, 2018 11:48 am
Forum: Please Introduce Yourself
Topic: Hello from Mississauga
Replies: 5
Views: 256

Re: Hello from Mississauga

Finding deals requires knowledge (where and what vendors to look for and how to enter a search criteria) and persistence. Biding techniques also matter for places like e-bay - pointless to end up in a biding war if you need to spend wisely. Some chinese dealers on e-bay often have deals but these ar...
by Dennis P Brown
Mon Nov 12, 2018 11:26 am
Forum: Vacuum Technology (& FAQs)
Topic: Advice on locating reason for poor vacuum?
Replies: 4
Views: 227

Re: Advice on locating reason for poor vacuum?

There are a number of "tricks" to detect leaks depending on their type: real or virtual (i.e. out gassing.) For a virtual leak, the best method is time; that is, keep the system running for a day or two and see how much, if at all, it improves. A slow but steady improvement tends to indicate one is ...
by Dennis P Brown
Sun Nov 11, 2018 12:18 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 14
Views: 1219

Re: My progress II

Impressive. Good start. Don't forget, neutron detection is also required for a real fusor. Also, a gate valve is needed to "throttle" the turbo so your deuterium isn't used up in just a few runs.
by Dennis P Brown
Sun Nov 11, 2018 12:06 am
Forum: Please Introduce Yourself
Topic: Hello from Mississauga
Replies: 5
Views: 256

Re: Hello from Mississauga

A two stage mechanical pump cannot get to 10^=4 torr, ever. Your gauge is in error. Adding a second mechanical pump will not lower the vacuum very much (assuming the system is capable of the 10^-2/10^-3 range.) There are no easy methods to get into or below the 10^-3 torr range without a diffusion o...
by Dennis P Brown
Sat Nov 10, 2018 10:16 am
Forum: Please Introduce Yourself
Topic: Hello from Mississauga
Replies: 5
Views: 256

Re: Hello from Mississauga

Hello and sounds like you have some good experience with developing electric induced plasma's. A two stage pump can't readily achieve 10^-3 torr much less achieve 10^-8 torr. Even a good turbo would struggle except with a very tight system that is extremely clean. So, I assume that is a typo. Along ...
by Dennis P Brown
Sat Nov 10, 2018 9:54 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: “Magnetically insulated grid IEC”
Replies: 26
Views: 7060

Re: “Magnetically insulated grid IEC”

A suggestion - since your device is on-view, why not post pictures of the apparatus with some details and descriptions. Then, I would think posting details (general) of your approach and how you believe your design will improve upon fusor performance would both better support your ideas and provide ...
by Dennis P Brown
Fri Nov 09, 2018 12:24 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: “Magnetically insulated grid IEC”
Replies: 26
Views: 7060

Re: “Magnetically insulated grid IEC”

While my post was hard, I am not happy when someone makes claim's that they have discovered a breakthrough in fusion (net energy) without peer-reviewed proof nor at least some research that demonstrates they are doing something that is, at the very least, based on known physics relative to that goal...
by Dennis P Brown
Tue Nov 06, 2018 11:35 am
Forum: Images du Jour
Topic: putt-putt boat fusion
Replies: 6
Views: 611

Re: putt-putt boat fusion

The Japanese manufacturing an American PT boat is rather ironic; not unlike NIF with its claims that it would do break even fusion research rather than their real reason to exist - aid development of new weapons (they failed in that effort too.) Wrong laser, wrong illumination methodology,and wrong ...