High Power SCR Driver Design for Plasma Compression Coil Activation

AI Thread Summary
The design involves driving two high-power SCRs to activate a plasma compression coil, with a focus on the placement of diodes in the circuit. The user seeks clarification on whether diodes should be inserted between the isolated drivers and the limiting current resistors, specifically for optimal circuit functionality. The circuit aims to charge a 6mF capacitor using a resistor and then discharge its energy through a superconducting inductor surrounding the plasma. The goal is to ensure that most of the current returns to the capacitor after activation. Overall, the discussion centers on circuit design considerations for effective plasma coil activation.
Javier Lopez
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I have made following design to drive two high power hokeypuck SCRs to activate a Plasma compression coil. As long as catode falls below 0V, I do not know if it is needed to insert diodes from the optoisolated driver A1 (and A2) and the limiting current resistor R1 (and R2):
 

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Where exactly would you insert those diodes? And can you show the full circuit for the gate drive circuits?
 
Here is the complete drawing. U1 and U2 are isolated drivers. I ask if I have to insert a diode between U1 and R1 and another between U2 and R2 (in the forward resistor direction). (The R3 and R4 are set to drain the inducted voltage due high dV/dt at SCR due >10kAmps are drain).
My idea is to charge the 6mF capacitor using R5, then drain the capacitor energy through the coil sorrounding the plasma that is L1 by using a trigger signal named "control". As long as L1 is a superconducting inductor, most of the current will come back to the capacitor then I will switch off the device :)
30m6beg.png
 

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