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Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
The only reason i won't hook it up to some 3kw ZVS driver. Is that i'm freaking afraid of X-Rays :P. I'll be using powers ranging from 15 watts to 85 watts at 10 kv to 15 kv.
Registered Member #10052
Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Low acceleration potential means low energy electrons that will scatter. I'm afraid you might be taking a misguided and somewhat dangerous approach towards charging people and playing with static.
When high-energy electrons collide with metals, they tend to produce X-rays. Aluminum foil and/or copper wire may not be a great idea if you're worried about this type of thing.
Even relatively low-voltage vacuum tubes produce enough radiation to be conscious of and careful with.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
HighVoltageFeathers wrote ...
Just watch out, get above 10-20 KV acceleration potential and you'll start making penetrating-wavelength X-rays.
Low energy X-ray photons can cause serious burns simply because they do not penetrate and pass through the body. All their energy is absorbed by tissue, causing relatively more destruction. X-ray burns take a long time to heal, and increase the long term probability of cancer formation.
1 torr is a lot, a 2 stage pump would have to be in a horrible state to manage only 1 torr. Probably not enough as a backing pump. You want something below 400miliTorr for a diff pump, maybe higher for a turbo-drag pump.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Alright you will not get a good enough vacuum with just a two stage rotary pump. There will be too many air molecules left that will introduce space charge to dilute what you are doing. You need a vacuum of 1x 10 to the minus 6 torr or better. To avoid harmful x-rays you need anode materials of light Z where Z is the atomic weight ie aluminum good, tungsten bad. no real problem until 20kV acceleration that is why most evaporation sources that are used in the semi industry stay below 20kV. As for the tire inflator this is junk in the world of mechanical vacuum. You will need a good two stage vane pump to back a diffusion or turbo pump. These require vacuums on their fore lines of better than 2 x ten to the minus 1 torr to work -Preferably better. A 10kV @ 40mA electron beam ie 400 watts of heat in vacuum is beast to recond with.
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