I am in need of field emission miniature electron source of dimension( 1-2 mm diameter emission area and few mm long) which could generate few micro-amp of current at 100-200 V of applied voltage. I know of " cathode.com" which commercially supplies such gun but could someone give me the name of some other company which supplies similar product?
We research this type cathodes (with graphene, with the carbon tubes) from the point of view of the fundamental features of their work. In studies they show themselves not good from the point of view of stability and require specific treatment. This is my vision as a researcher. Major role is played by demands on the cathode, at what distance he is from the anode, the degree of similarity must be area of the emission (at the anode), what is the current stability, energy electroy should generate the cathode. The last cathode we investigated the diameter of the working surface of 0.5 mm, distance anode-cathode is 15 mm at a voltage of 3000 - 4000 V, the emission current was 1 - 10 µa. Theoretically we could manufacture a series of cathodes for you. One must know the specifications you want.
It is nice to hear from you @Василий Трофимов about your research. I think that one could reduce the distance between cathode and anode to say 1-2 mm and then I hope it could deliver similar current of 1-10 micro-amp for voltage around 300-400 V. Is it so.... Have you tried lowering the distance......?
This is the first experiment with carbon nanotubes which we prepeared. That is why we specially made a large distance. we can't do experiments quickly, as carried out in ultrahigh vacuum. May be able to assess the increase in current with decreasing distance, a few days to write. You can talk to Dr. Georgiy Fursey ([email protected]) it is more than me involved in such cathodes can tell.
Why you want carbon nanotubes cathod?
My requirement is to generate high current (1-10 micro amp) with small voltages (~ 200 V or so). This will be used for trapping electrons in Penning trap. If you could mention some commercial company who do supply such sources or such graphene films like you prepare at your lab, it would be helpful? Moreover, I am skeptic that it is how much feasible to receive such films from your lab and import it from Russia to India......
I have a friend who have suggested me the following companies which supply CNT based field emission source and I hope it could be helpful for others in the field
One can look for following links:
i)http://www.xinnanomaterials.com/Conductive%20Films_EN.html
ii)http://www.euclidbeam.com/?page_id=143
iii)http://xinraysystems.com/index.php/carbon-nanotube-cathodes/
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