Search found 618 matches

by Andrew Seltzman
Mon Oct 14, 2019 4:54 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Non-Corrosive and/or Dielectric Liquid Cooling?
Replies: 16
Views: 337

Re: Non-Corrosive and/or Dielectric Liquid Cooling?

Teflon and nylon tube are both good, as are viton o-rings. You can get teflon and nylon ferules and fittings from swagelok.
by Andrew Seltzman
Sun Oct 13, 2019 5:43 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Non-Corrosive and/or Dielectric Liquid Cooling?
Replies: 16
Views: 337

Re: Non-Corrosive and/or Dielectric Liquid Cooling?

Here is the documentation on the fluorinert cooling of my grid: http://www.rtftechnologies.org/physics/fusor-mark3-index.htm Fluorinert does evaporate slowly (much slower than ethanol), so a mostly closed system is recommended. A simple plastic cap or over pressure vent valve on the reservoir will d...
by Andrew Seltzman
Sat Oct 12, 2019 6:51 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Non-Corrosive and/or Dielectric Liquid Cooling?
Replies: 16
Views: 337

Re: Non-Corrosive and/or Dielectric Liquid Cooling?

Fluorinert is best. It has no health issues at all, unless you burn it (don't). https://www.ebay.com/itm/3M-Fluorinert-FC-77-1L-Quick-delivery/264470677091?hash=item3d93ae4663:g:4wUAAOSwpOVdhGs6 https://www.ebay.com/itm/3M-Fluorinert-Electronic-Liquids-FC-40-500-ml/183830136622?hash=item2acd21472e:g...
by Andrew Seltzman
Thu Oct 10, 2019 2:03 am
Forum: Vacuum Technology (& FAQs)
Topic: First ever Turbo experience
Replies: 16
Views: 537

Re: First ever Turbo experience

Welcome to the world of turbos, if all goes well you'll never want to go back to a diffusion pump again. If all doesn't go well I encourage you go get another turbo. A turbo pump is a fine addition to a fusor, hopefully it will give you many years of quality vacuum without any oil back streaming of ...
by Andrew Seltzman
Fri Apr 05, 2019 4:23 am
Forum: Vacuum Technology (& FAQs)
Topic: Simple turbo pump controller
Replies: 49
Views: 31160

Re: Simple turbo pump controller

The older pfeiffer TC-100 controllers are getting so cheap on ebay that I would not recommend building your own at this point.
by Andrew Seltzman
Sun Mar 24, 2019 4:20 am
Forum: Announcements and Site Administration Topics
Topic: web site problem
Replies: 18
Views: 7388

Re: web site problem

Checking active topics via the "search.php?search_id=active_topics" link is the way I (and probably others) check for new posts on the forum. Access to this link is now disabled unless you are logged in. Also fusor.net keeps logging me out automatically now after some period of time. Do we have a se...
by Andrew Seltzman
Sun Mar 24, 2019 3:13 am
Forum: Announcements and Site Administration Topics
Topic: web site problem
Replies: 18
Views: 7388

Re: web site problem

Could we modify the "search restrictions" to allow viewing of "active topics" without having to log in?
search.php?search_id=active_topics
by Andrew Seltzman
Sat Mar 23, 2019 7:48 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Anode layer ion source. Operation pictures
Replies: 63
Views: 55201

Re: Anode layer ion source. Operation pictures

I have a mass-producible base-plate design for the anode layer ion source using an aluminum cutout from Front Panel Express IMG_20190320_235610180a.jpg A hermeticallly sealed Pasternack PE4077 BNC connector is used as the HV feedthrough. It's rated to 500v with a dielectric withstanding voltage of 1...
by Andrew Seltzman
Sat Mar 23, 2019 4:42 pm
Forum: Announcements and Site Administration Topics
Topic: web site problem
Replies: 18
Views: 7388

Re: web site problem

I would like to weigh in strongly against #1 "1. Not all categories are visible without being signed in." and suggest that for #2: "2. Search functions and other parsing functions are not accessible without being signed it" should be modified to allow users that are not signed in to search after sol...