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• New vacuum chamber

  Hyna • 05/25/2021 at 10:42 • 0 comments

  100 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 :)
  

• Grant application

  Hyna • 05/18/2021 at 10:19 • 0 comments

  Just quick vide for small grant application. More detailed video in english will follow.

• When the beam gets out of focus

  Hyna • 04/20/2021 at 00:07 • 0 comments

  Melted 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...
  

• New wehnelt

  Hyna • 04/13/2021 at 13:52 • 0 comments

  Filament centering in wehnelt.
  

• playing with beam

  Hyna • 04/05/2021 at 22:41 • 1 comment

• Implosion protection

  Hyna • 11/13/2018 at 22:03 • 0 comments

  Boys from our hackerspace are afraid of glass jar implosion :) This is the metal frame which will be covered by fine metal fabric.

• Quick update - vacuum

  Hyna • 11/07/2018 at 20:30 • 0 comments

  New silicone gasket for better vacuum.
  

  
  

• Maker faire Prague

  Hyna • 06/24/2018 at 09:59 • 0 comments

  @MakerFaire

• Electron gun

  Hyna • 06/20/2018 at 00:31 • 1 comment

  A lot of progress in these days. 

  Three days left to Maker Faire Prague ...

• HV power supply

  Hyna • 04/16/2018 at 22:42 • 0 comments

  Done with vacuum controller, time to make some HV :D

  STM32->gate drivers->full-bridge at 50kHz->transformer>500W dummy load.

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