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TOPIC: Development of triggering methods
#407
11 years 2 months ago
Development of triggering methods
I suggest the use of very narrow (few nanoseconds) high power (hundreds of watts) pulses. No more than few kilopulses per second. For this purpose you can use very cheap avalanche transistors (2N4401, 2N5551, 2N5192, ZTX415) and 1nF 1kV capacitor charged by > 200K resistor. It's important to keep low the inductance of discharge path.
www.diodes.com/_files/products_appnote_pdfs/zetex/an8.pdf
Another interesting idea is the use of Grekhov diodes.
This patent application describes well a simple pulse generator that uses Drift Step Recovery Diodes (or Grekhov diodes):
www.google.com/patents/US20100038971
It's important that the active wire presents a very low parassitic inductance: bifilar winding should be a fair solution.
The formula:
0.5*C*V*V*N
(where C is the Capacity in Farad, V the voltage of the full charged capacitor and N the number of pulses in a second) may be used for computing an UPPER limit of the output power from the avalanche pulser.
Using a 0.1$ transistor as 2N4401, you can generate (at 1KHZ) few tens of nanoseconds wide pulses of more than 200W peak power on a pure resistive load of 50 ohm using less than 0.1W of average input power!
www.diodes.com/_files/products_appnote_pdfs/zetex/an8.pdf
Another interesting idea is the use of Grekhov diodes.
This patent application describes well a simple pulse generator that uses Drift Step Recovery Diodes (or Grekhov diodes):
www.google.com/patents/US20100038971
It's important that the active wire presents a very low parassitic inductance: bifilar winding should be a fair solution.
The formula:
0.5*C*V*V*N
(where C is the Capacity in Farad, V the voltage of the full charged capacitor and N the number of pulses in a second) may be used for computing an UPPER limit of the output power from the avalanche pulser.
Using a 0.1$ transistor as 2N4401, you can generate (at 1KHZ) few tens of nanoseconds wide pulses of more than 200W peak power on a pure resistive load of 50 ohm using less than 0.1W of average input power!
#408
11 years 2 months ago
Development of triggering methods
Hi Giorgio,
Great to hear from you again.
Please sign up to the new mini-project in the Collaborate section and I'll add you to the working document.
There you will be able to add ideas, experimental design, drawings and hopefully we'll see if there is any effects!
www.quantumheat.org/index.php/collaborat...and-equipment-design
Bob
Great to hear from you again.
Please sign up to the new mini-project in the Collaborate section and I'll add you to the working document.
There you will be able to add ideas, experimental design, drawings and hopefully we'll see if there is any effects!
www.quantumheat.org/index.php/collaborat...and-equipment-design
Bob
#440
11 years 2 months ago
Development of triggering methods
It is not clear that non-equilibrium conditions are required for initiating an LENR reaction, although it has been mentioned in several papers, including one by Godes.
If you elect to try pulses as a trigger method, keep in mind that considerable peak powers will be required. For example, a typical wire might have a DC resistance of 5 ohms. A reasonable pulse would entail a 1000V supply operating through transistors capable of handling >200 Amp peak currents. The resulting current density in the wire is ~400KA/cm2. These type of voltages and currents can be handled by paralleled IGBTs. I have designed such a pulse generator which can drive impedances down to 4 ohms with 1.0 kV 5 us pulses. Rise and fall times are ~200 ns. Wire inductance needs to be carefully controlled; for example, a simple solenoid winding will probably not work. Bifilar winding is better. Also, the cabling between the generator and NiCu wire should be< 18". Note: the voltages and currents in such a circuit are dangerous.
Jeff
If you elect to try pulses as a trigger method, keep in mind that considerable peak powers will be required. For example, a typical wire might have a DC resistance of 5 ohms. A reasonable pulse would entail a 1000V supply operating through transistors capable of handling >200 Amp peak currents. The resulting current density in the wire is ~400KA/cm2. These type of voltages and currents can be handled by paralleled IGBTs. I have designed such a pulse generator which can drive impedances down to 4 ohms with 1.0 kV 5 us pulses. Rise and fall times are ~200 ns. Wire inductance needs to be carefully controlled; for example, a simple solenoid winding will probably not work. Bifilar winding is better. Also, the cabling between the generator and NiCu wire should be< 18". Note: the voltages and currents in such a circuit are dangerous.
Jeff
#468
11 years 1 month ago
Development of triggering methods
There are so many ways to trigger. Rf, lazer, spark gap, IR pulses, plasma arc, tesla coil, electolysis cell, ultrasonic cavitation. It sounds like nearly any short burst of energy will work. We should be seeing LENR all around us everyday.
I was looking at using either mosfet, scr of igbt for the low resistance high voltage pulser. I found some mosfets that go to over 2000 v. Scores of scrs in this voltage range. The igbt's I found seemed a bit slow. I'd love to see some details of your efforts. They sound much like broad band high power radar transmitters.
jdk
I was looking at using either mosfet, scr of igbt for the low resistance high voltage pulser. I found some mosfets that go to over 2000 v. Scores of scrs in this voltage range. The igbt's I found seemed a bit slow. I'd love to see some details of your efforts. They sound much like broad band high power radar transmitters.
jdk