Search found 137 matches

by Michael Bretti
Sun Jul 15, 2018 8:12 pm
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 53
Views: 8000

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

Quick update on the cooling system build. Below is a picture of the V2 system so far: Cooling System Update - Front.jpg Cooling System Update - Back.jpg I currently have all of the hardware needed to complete the system, it is just a matter of finishing up some of the custom components. All brass ha...
by Michael Bretti
Sun Jul 01, 2018 3:38 am
Forum: Please Introduce Yourself
Topic: Re-Introduction from Massachusetts
Replies: 1
Views: 238

Re: Re-Introduction from Massachusetts

Andrew, Welcome to the forums. I myself am originally from MA, currently residing in Upstate NY. While fusors are one of my favorite fusion neutron sources, along with the dense plasma focus and beam on target systems, at this point I personally have no intention in building a fusor myself (already ...
by Michael Bretti
Sat Jun 23, 2018 5:18 am
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 53
Views: 8000

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

Another update on the cooling system. In my initial designs, I forgot a key parameter that has forced me to redesign the whole system from scratch. While mechanically and thermally the system was sound, chemically it was not. In my cooling loops, I had brass, copper, stainless, and aluminum. These m...
by Michael Bretti
Sun Jun 17, 2018 9:59 pm
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 53
Views: 8000

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

Quick update on the cooling system build. The primary and secondary water tanks have been completed and assembled. Attached to the tanks are the thermocouple gauges, as well as fill ports at the top, and brass hose fittings for the cooling lines. A couple of additional ports were added as mentioned ...
by Michael Bretti
Thu Jun 14, 2018 3:55 pm
Forum: Books & References
Topic: Vacuum Engineering Textbooks
Replies: 4
Views: 1272

Re: Vacuum Engineering Textbooks

No problem, great to hear you could find all four books for even less. I believe when I ordered my books, it took much less than the estimated wait time. In any case, they are definitely worth the wait, especially the first two books on the list.
by Michael Bretti
Thu Jun 14, 2018 4:14 am
Forum: New User Chat Area
Topic: HV rated feedthroughs
Replies: 5
Views: 692

Re: HV rated feedthroughs

Generally yes this is correct, but it depends also on how the feedthrough is insulated on the vacuum side, and whether there is plasma or not, in addition to surface defects and contamination. I don't believe Paschen's Law applies the same if the gas is already pre-ionized or as a plasma. If the ins...
by Michael Bretti
Tue Jun 12, 2018 2:24 pm
Forum: New User Chat Area
Topic: HV rated feedthroughs
Replies: 5
Views: 692

Re: HV rated feedthroughs

Note that you need to take into consideration both sides - a high voltage feedthrough is not just an insulated conductor to atmosphere, but to the vacuum side as well. You can "upgrade" the atmospheric side insulation to hold off more, but at some point it will arc on the vacuum side if there is not...
by Michael Bretti
Mon Jun 11, 2018 2:12 pm
Forum: Books & References
Topic: Vacuum Engineering Textbooks
Replies: 4
Views: 1272

Re: Vacuum Engineering Textbooks

Ameen, It depends on the level of depth you want to get into, and what information you are seeking exactly. If you want to get into the basics of high vacuum components and systems without getting too deep, the last two books are great references. However, if you want to get into more advanced topic...
by Michael Bretti
Mon Jun 11, 2018 1:52 pm
Forum: New User Chat Area
Topic: Diffusion pump power wire convert
Replies: 7
Views: 704

Re: Diffusion pump power wire convert

Diffusion pumps do not need any special controller. They just run directly on 120 or 240 VAC, not DC. You can just connect it directly to a properly sized and rated power chord for the required current/voltage and should be good to go. I also agree that the second pump is grossly overpriced, absolut...
by Michael Bretti
Mon Jun 11, 2018 2:48 am
Forum: Vacuum Technology (& FAQs)
Topic: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System
Replies: 53
Views: 8000

Re: High Vacuum Engineering Design, Analysis, and Build of a Small-Scale Multipurpose System

A few updates on the cooling system, control system, and overall direction of this project. For the cooling system, the secondary tank capacity was increased a bit from the initial design. I had originally spec'd a 3"x10" pvc tank. However, since I was already using 4" pvc for the main tank and had ...