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I have a baaaaad feeling about this.
What capacitors are you using to make a 1.8F 330V capacitor bank?
Do you know that capacitors have a voltage rating?
Do you realize that you are looking at storing about 10KW of energy in the bank?
What do you plan to do with the energy when the caps are charged up?
---55p
A little math & clarification: stored energy is measured in Joules, in your case 98000J. (Capacitance / 2 * Voltage squared). Charging that bank with 2kW of constant power will take 50 seconds. Charging it with a constant current of 18 Amps is going to make the voltage rise with 10V/second, making for a 33 second charge.
Now, the challenge is, how are you going to go about hooking that big short-circuit to the mains w/o blowing fuses or burning transformers?
And I don't think that 20A transistor is going to hold up for many milliseconds.. At that current level you could also just as well have operated straight from the mains. The point with such a capacitor bank is to be able to pulse out thousands of Amps..
The point is not wether you care about the charging time or not, but how you intend to make a charging circuit that is up to the task at all.. It's not as easy as using a transformer and perhaps a resistor.
Use 4 such transistors if you will, they'll still be going blam.. If they don't then your gun isn't work very well anyway.
What are your resources?
The 10KW came out of the fact that I somehow though you were planning to discharge the caps over 10 seconds (100KJ over10 seconds). Looking over what you wrote before my post, I have no idea where I got that impression. My bad.
What you are trying to built is called a coil gun. You can find a number of designs and discussions on the web. Some are downright dangerous; far more so for the person building and firing it than for whatever is being shot at.
You are dealing with some fairly dangerous stuff with minimal appreciation for the risk. I really do not feel comfortable with this. So I will suggest that you not do what you are thinking of doing because it is dangerous and bow out of the discussion.
---55p
Mitchekj clearly articulated both his and my concern. With the level of technology you have, I am not too worried about the well-being of your target, even though you can still kill or injure someone if you are careless or irresponsible. I am much more worried about your well-being.I know that this is dangerous so i will not really use it... the main purpose is to put it on my shelf as an achievement.
Oh. But my coil has resistance and it will charge up flux causing a magnetic field right? which acts like a resistor so there wont be thousands of amps going past the coil.A little math & clarification: stored energy is measured in Joules, in your case 98000J. (Capacitance / 2 * Voltage squared). Charging that bank with 2kW of constant power will take 50 seconds. Charging it with a constant current of 18 Amps is going to make the voltage rise with 10V/second, making for a 33 second charge.
Now, the challenge is, how are you going to go about hooking that big short-circuit to the mains w/o blowing fuses or burning transformers?
And I don't think that 20A transistor is going to hold up for many milliseconds.. At that current level you could also just as well have operated straight from the mains. The point with such a capacitor bank is to be able to pulse out thousands of Amps..
Oh. But my coil has resistance and it will charge up flux causing a magnetic field right? which acts like a resistor so there wont be thousands of amps going past the coil.
When i tried to shoot it by 2 wires contacting, there was a big spark and the tips of the copper wire melted and fused together. I dont think thats 1000 amps because the outlet is 20A and it can vaporize copper so 1000A can cause the surrounding air to form plasma right? i would say that my current may be 40-60 Amps I can upload pictures in a few days...
OK, a couple of observations.
The really great thing about a rail gun is that it provides so many opportunities to win a Darwin award.
You are messing with lethal stuff 1.8 FARAD is huge if that gets old of you you will be history i cannot believe anybody don't tell you that.