Fusor Forums

As I tend do everything oldshool, analog way, I’m using Siemens C1012 two channel chart recorder: 447C459B-E242-446E-BE6C-1D05A43333FE.jpeg Works great for me - each channel is selectable AC/DC, current/voltage with many ranges. Paper speed is adjustable and I can take notes and make marks on on it ...

In fact I won’t be surprised if those expensive oils are the exactly the same product as the mass produced industrial oils just repackaged and rebranded by Kurt Lesker, Varian or Alcatel...

I’ve a question to those with pirani gauges experience. For the demo fusor at work I’ve used the thermoelectric gauges but in my garage setup (https://fusor.net/board/viewtopic.php?f=10&t=13708) I’m using the double head pirani. Today I’ve made some test discharges at low vacuum (1e-2 to 5e-5 Torr) ...

Today I’ve changed oil in my BL8 rotary vane pump (the description of the vacuum system is in the separate topic: https://fusor.net/board/viewtopic.php?f=10&t=13708). I’ve used the cheap industrial grade VG68 class oil for milking machine pumps: 640F0BFC-3FF4-49F3-B815-8148B06F3897.jpeg On the new o...

For some time I was building a power supply for my garage fusor and other plasma experiments. This is a demo grade PSU based on the step up transformer from an old breakdown tester. I’ve bought the complete tester quite cheaply and scavenged the trafo, a very nice variable auto transformer and some ...

Unfortunately I don’t have even single shed full of HV power supplies, so probably I will end winding my own transformer. Regarding the voltage multiplying - I’m not planing any. I hope that magnetic assistance/ion sources will compensate for the low end performance of the planned PSU. And in the wo...

I’ve just assembled a HV power supply for demo fusor/general plasma experiments. This is 5kV supply based on the breakdown tester transformer. I’ll post the details when I’ll do the load measurements, so I can report the detailed performance. 1CCF5131-F36E-4EE3-AA21-AD9DFE40A320.jpeg The small 5kV s...

For first tests I would try any inexpensive industrial vacuum pump oil like Total Agritraite 68. Or this one: https://www.ebay.es/itm/ACEITE-BOMBA-VACIO-VACUUM-PUMP-OIL-SUNOCO-1000ml-REFRIGERACION/323956124731?hash=item4b6d4a2c3b:g:qRIAAOSwJ9VdrzkT Regardin the piston/rotary question - for me the sh...

There are super expensive, very low vapor pressure oils offered by vacuum companies like Varian or Leybold. And a lot of generic vacuum pump oils for industrial use (milking, vacuum packaging, handling, HVAC). Until you don’t expected your pump to work on the limit of it’s performance (and this requ...

The oil is fresh DC704 and the whole system is cleaned and overhauled. I don’t believe this ultimate pressure, it seem to me as gauge fault. I’m using very similar system at work (same pumps and valves) and it routinely pumps down to 1e-6 mBar (7.5e-7 Torr) but it takes a bit longer.