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New vacuum chamber
05/25/2021 at 10:42 • 0 comments100 kg of iron. It require few modifications, but with this chamber it will be possible to increase acceleration voltage and stay safe from x-ray.
Chamber was donated from ThermoFisher Scientific, thank you :)
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Grant application
05/18/2021 at 10:19 • 0 commentsJust quick vide for small grant application. More detailed video in english will follow.
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When the beam gets out of focus
04/20/2021 at 00:07 • 0 commentsMelted solder on anode. About 200W by an accident.
As a next step, i need to redesign HV feedthrough. I used to use spark plugs, but for filament @2Amps, the spark plug resistance increased slowly from 5R to ~15 Ohm each. That is an issue, since the filament has 1 Ohm and Im using 6s RC battery with stepdown. So there is no headroom for proper regulation.
I'm wondew what is inside of the spark plugs, or why the resistance increased.
Im facing hard decision to discard whole setup and start again. I want to increase accelerating voltage to 30kV. But with current setup with glass jar, it is big no no due to x-ray.
Also the electron gun deserves proper calculations/simulations.Last thing is that e-gun is classified in my country as "small" sources of ionizing radiation and undergo regulations. The State Office for Nuclear Safety has trainings for radiation safety, which is not that expensive. Maybe it is time to refresh some knowledge.
It will require some fundings to move to the next stage...
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New wehnelt
04/13/2021 at 13:52 • 0 comments -
playing with beam
04/05/2021 at 22:41 • 1 comment -
Implosion protection
11/13/2018 at 22:03 • 0 commentsBoys from our hackerspace are afraid of glass jar implosion :) This is the metal frame which will be covered by fine metal fabric.
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Quick update - vacuum
11/07/2018 at 20:30 • 0 commentsNew silicone gasket for better vacuum.
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Maker faire Prague
06/24/2018 at 09:59 • 0 comments@MakerFaire
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Electron gun
06/20/2018 at 00:31 • 1 commentA lot of progress in these days.
Three days left to Maker Faire Prague ...
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HV power supply
04/16/2018 at 22:42 • 0 commentsDone with vacuum controller, time to make some HV :D
STM32->gate drivers->full-bridge at 50kHz->transformer>500W dummy load.