One of the mechanisms that seems to work in stimulating the LENR reaction is EMF stimulation. There is a number of threads of research that might be tied together to get a handle on what could be the character and structure of this stimulation.
One of this treads is the Superwave patented in 2003 by Energetics Technologies, L.L.C.
The patent depicts the Superwave waveform as follows:
This waveform seems to help in starting the LENR reaction in electrolytic based systems.
It looks like a fractal based waveform with the primary wave repeated in superposition as a half or quarter wave of the primary wave in iterative fashion.
But what is the goal of the Superwave? I believe that the goal is to get to a very high frequency in the terahertz range using simple electronics in order to drive the dipole motion of the plasmons that are the fundamental power source of the LENR reaction through resonance.
Letts and Cravens found a number of LENR active resonances by using two lasers that produced beats through interference. They found there was a number of LENR stimulation frequencies in the terahertz region. In THz, 8.4, 14.5, 14.75, 15.3 and a broad resonance peak at 20 and 21.4.
By using the Superwave format, the goal is to get to one of these LENR active resonances at the smallest fractal resolution.
To build the our superwave, lets choose the 20 THz frequency as the smallest waveform in our compound superwave format.
We use the half wave fractal pattern, that means that the sign waves that form the superwave go like this
20, 10, 5, 2.5, 1.25, .625, 0.3125, 0.15625, 78.125 GHz, 39.0625 and so on until we get down to a low frequency or 20 harmonics. This Superwave form will resolve to a square wave or a saw tooth wave.
The harmonics that Rossi used in the Lugano test looked like a combined half wave and quarter wave mix.
The Lugano repost said that "The figure reveals that all the most important harmonics are contained within the 20th harmonic, and, therefore, that all the wave shape harmonics input to the system lie within the PCE’s measuring range"