Stafford Fusion Lab 
Researching the future 


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Electrics


The energy to supply the power to the tokamak coils will be stored in a series of capacitor banks which will be slowly charged by power supplies of various voltages and then discharged in milliseconds using a total of seventeen Y55KPE (Techsem, 2017) thyristors, these are large devices which need to be clamped between heatsinks when used, one of these devices is shown below:



The specification shown above does not show Itsm (surge on-state current), which for the Y55KPE has a maximum value of 26KA and is the relevant value when the thyristor is used in this way.


A range of different voltages will be required to charge the capacitor banks (450V, 900V, 1800V and 3800V), the multi-rail power supply shown below (left) and the 1kV transformer shown below (right) could be used along with voltage doubler/tripler circuitry to provide the required charging voltages.



References

Techsem (2017). Y55KPE Phase Control Thyristor

Any enquiries should be directed to: admin @ staffordfusionlab.co.uk