#4a FAQ - Wiring for real fusion fusor - part one
Posted: Tue Mar 02, 2004 2:10 pm
This diagram is for a demo fusor using a 15kv neon sign transformer. However, the basic circuit shown can, with extra 100 meg resistors in series and modified voltage metering circuitry be tied to a large 40kv or greater grounded, center tapped power transformer. Such high voltage transformer types are found in electrical distribution transformers and potential transformers as well as the ocassional X-ray system transformer.
For a full blown fusing fusor system, X-ray transformers are best. A 60kv center tapped x-ray transformer can be expected to give a peak rectified voltage in this circuit of 30 X 1.414 = 42 kilovolts Which is just capable of getting up to 1 million neuts/sec in a well designed and operated fusor at 10 to 15ma. Note: With this higher voltage transformer example, the metering circuit would need more series 100 meg resistors and a different metering setup to read to over 40kv. The figuring of this voltage metering circuit is left to the individual.
Needless to say, such transformers are lethal and demand a massive 50amp 240 volt breaker box connection. They are unforgiving. One wrong step and you are dead. Of course, real fusion high voltage must be at least 25 kilovolts DC and this, in and of itself, is instantly lethal.
The 100 megohm resistor is best made up of 10, 10 megohm 1 watt 2% or better flame proof resistors, in series, floating in air between two posts on clean plexiglass. True 100 meg resistors, (hard to locate), can be used in series for larger voltages than 10kv. I prefer 0ne 100meg resistor in the voltmeter circuit for every 10kv of desired output.
You will note this same circuit "layout" can function for both a neon demo supply and a full blown fusing fusor system. The difference is that this circuit for higher voltage more powerful center tapped transformers would demand handmade diode strings and a suitable large 50-100 watt ballast resistor in series with the HV output line and the above mentioned metering changes.
Richard Hull
For a full blown fusing fusor system, X-ray transformers are best. A 60kv center tapped x-ray transformer can be expected to give a peak rectified voltage in this circuit of 30 X 1.414 = 42 kilovolts Which is just capable of getting up to 1 million neuts/sec in a well designed and operated fusor at 10 to 15ma. Note: With this higher voltage transformer example, the metering circuit would need more series 100 meg resistors and a different metering setup to read to over 40kv. The figuring of this voltage metering circuit is left to the individual.
Needless to say, such transformers are lethal and demand a massive 50amp 240 volt breaker box connection. They are unforgiving. One wrong step and you are dead. Of course, real fusion high voltage must be at least 25 kilovolts DC and this, in and of itself, is instantly lethal.
The 100 megohm resistor is best made up of 10, 10 megohm 1 watt 2% or better flame proof resistors, in series, floating in air between two posts on clean plexiglass. True 100 meg resistors, (hard to locate), can be used in series for larger voltages than 10kv. I prefer 0ne 100meg resistor in the voltmeter circuit for every 10kv of desired output.
You will note this same circuit "layout" can function for both a neon demo supply and a full blown fusing fusor system. The difference is that this circuit for higher voltage more powerful center tapped transformers would demand handmade diode strings and a suitable large 50-100 watt ballast resistor in series with the HV output line and the above mentioned metering changes.
Richard Hull