Looks nice!
I have entered your coils in my spreadsheet and it says:
Primary:
wire length: 2.356 m
inductance: 3.363 uH
This differs quite a bit from your measured (?) inductance. Do you still have the variable inductance attached, while measuring?
Secondary:
wire length: 48.54 m
inductance: 877 uH (that is much closer to the measured value)
SRF: 1111 KHz (based on C and L values of this coil)
velocity factor: 0.69
SRF: 1059 KHz (based on v-fact and wire length)
Extra:
wire length: 45.54 m
inductance: 917 uH (based on equal spacing over entire coil)
SRF: 2239 KHz (based on C and L values of this coil)
velocity factor: 1.34
SRF: 2200 KHz (based on v-fact and wire length)
Total wire length in sec. system: 94.08 m
v fact in sec. system: 1.005
Working frequency derived from these values: 801 KHz
With a primary L of 3.363 uH you would need 11.7 nF in the prim. circuit
With a primary L of 6 uH you would need 6.58 nF in the prim. circuit
Based on this, I would say, instead of adding more caps, try once with 10 nF and adjust for resonance.
Just noticed that you actually ARE using 10 nF in the prim. circuit.
So that should be pretty good already.
On the top-load... it's capacitance should be about 6.14 pF.
If I take the calculated total L (1.7934 mH) that would result in a F-res of 1.5 MHz.
If I take the measured total L (2.005 mH) that would give an F-res of 1.4 MHz.
both are way above the 801 KHz calculated before.
I think you could try to increase the top-load to around 20 pF, so that this F-res matches the 1/4 wave length.
To get 300 KV on 20pF, you need 6 uC. This charge would travel 1.6 million times through your coils per sec resulting in 9.6 A. Judging from the pictures your wires should be able to handle that...
Ernst
I have entered your coils in my spreadsheet and it says:
Primary:
wire length: 2.356 m
inductance: 3.363 uH
This differs quite a bit from your measured (?) inductance. Do you still have the variable inductance attached, while measuring?
Secondary:
wire length: 48.54 m
inductance: 877 uH (that is much closer to the measured value)
SRF: 1111 KHz (based on C and L values of this coil)
velocity factor: 0.69
SRF: 1059 KHz (based on v-fact and wire length)
Extra:
wire length: 45.54 m
inductance: 917 uH (based on equal spacing over entire coil)
SRF: 2239 KHz (based on C and L values of this coil)
velocity factor: 1.34
SRF: 2200 KHz (based on v-fact and wire length)
Total wire length in sec. system: 94.08 m
v fact in sec. system: 1.005
Working frequency derived from these values: 801 KHz
With a primary L of 3.363 uH you would need 11.7 nF in the prim. circuit
With a primary L of 6 uH you would need 6.58 nF in the prim. circuit
Based on this, I would say, instead of adding more caps, try once with 10 nF and adjust for resonance.
Just noticed that you actually ARE using 10 nF in the prim. circuit.
So that should be pretty good already.
On the top-load... it's capacitance should be about 6.14 pF.
If I take the calculated total L (1.7934 mH) that would result in a F-res of 1.5 MHz.
If I take the measured total L (2.005 mH) that would give an F-res of 1.4 MHz.
both are way above the 801 KHz calculated before.
I think you could try to increase the top-load to around 20 pF, so that this F-res matches the 1/4 wave length.
To get 300 KV on 20pF, you need 6 uC. This charge would travel 1.6 million times through your coils per sec resulting in 9.6 A. Judging from the pictures your wires should be able to handle that...
Ernst
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