Voltage level for static E-feild
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Voltage level for static E-feild
Hi, I'm trying to make a ion gun, and was wondering at what voltage level would a 0.5mm needle emit electrons. Was planning to run it in a vacuum of about 0.1-0.5psi with a gap to target of 0.5-1mm.
I can get access to a 250nm UV lamp and was wondering if that would lower the threshold, and if the gas would effect the operation(if they become positive and get attached to the anode).
Cheers
I can get access to a 250nm UV lamp and was wondering if that would lower the threshold, and if the gas would effect the operation(if they become positive and get attached to the anode).
Cheers
Andrew Haynes
- Richard Hull
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Re: Voltage level for static E-feild
You would only need a kilovolt or so off a needle at that pressure, but your ions would not go far, unfortunately, as the mean free path would be only a couple of millimeters.
Richard Hull
Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
- Steven Sesselmann
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Re: Voltage level for static E-feild
Andy,
If you can rig up a system with differential pressure, so the gas pressure around the needle is higher, then you can generate ions at relatively low voltage and extract them into a chamber of lower pressure.
You place the needle cathode above an anode disc with a small hole, leading into a chamber of lower pressure.
Steven
If you can rig up a system with differential pressure, so the gas pressure around the needle is higher, then you can generate ions at relatively low voltage and extract them into a chamber of lower pressure.
You place the needle cathode above an anode disc with a small hole, leading into a chamber of lower pressure.
Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
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https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
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Re: Voltage level for static E-feild
Thanks you two for the info.
S_Sesselmann would that arrangement work without the difference in pressure?, what voltage level could it be with the right pressure variables?
I've added the idea to the drawing its a easy voltage doubler, and plan on useing a Rocker 300, 220V/50Hz oil free vacuum pump if the 300 means something....,
S_Sesselmann would that arrangement work without the difference in pressure?, what voltage level could it be with the right pressure variables?
I've added the idea to the drawing its a easy voltage doubler, and plan on useing a Rocker 300, 220V/50Hz oil free vacuum pump if the 300 means something....,
Andrew Haynes
- Steven Sesselmann
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Re: Voltage level for static E-feild
Sorry Andy, I don't quite understand your diagram, but in regards to the vacuum , you are going to need something better than a rotary pump, if you are going to experiment with ion optics. As Richard already explained, you need a high enough vacuum for the ion to have a sufficient mean free path.
Steven
Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
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Re: Voltage level for static E-feild
The path doesn't need to be long, from one end cap to the anode will be 1mm or less, or just don't want a arc discharge.
Thanks
Thanks
Andrew Haynes
- Steven Sesselmann
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Re: Voltage level for static E-feild
Andy,
Well in that case you will get an arc discharge of high current and low potential.
Not sure what you are trying to achieve with this experiment...
Steven
Well in that case you will get an arc discharge of high current and low potential.
Not sure what you are trying to achieve with this experiment...
Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
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Re: Voltage level for static E-feild
S_Sesselmann
I'm trying to make electron get accelerated from the anode to the end cap, but still not have a conductive path between the two. I thought that if the vacuum was good enough a electron won't start a averlance (spelling).
If I run this connected to a 15kv nst the voltages should add up , once the ac is reciftered, it should be easier than high frequency or having caps and diodes handle the full voltage
If not I can use salt water, but the efficiency will be lower.
Thanks
I'm trying to make electron get accelerated from the anode to the end cap, but still not have a conductive path between the two. I thought that if the vacuum was good enough a electron won't start a averlance (spelling).
If I run this connected to a 15kv nst the voltages should add up , once the ac is reciftered, it should be easier than high frequency or having caps and diodes handle the full voltage
If not I can use salt water, but the efficiency will be lower.
Thanks
Andrew Haynes