The following post was submitted by Axil Axil
Andrea Rossi has stated that the input power to his reactor must be supplied using an AC source in order for the LENR reactor to be viable. Putting this clue together with the revelation from Francesco Piantelli that pressure change is required to fire up the LENR reaction can lead us to speculate about the reaction mechanisms involved connecting these seemingly unrelated revelation. But these tidbit of clues can be conceded within a theoretical context.
To start with, nanoparticle production in a supercritical medium is activated by a pressure and/or temperature change. Hydrogen is a supercritical medium in which hydrides of lithium and/or aluminum are dissolved. A change in pressure will produce nanoparticles of lithium and/or aluminum if a pressure wave of sufficient strength is broadcast through the hydrogen gas.
Nanoparticles are the mainstay of the LENR reaction since they produce Surface Plasmon Polaritons (SPPs) within any aggregation of nanoparticles. An alternating current will produce a magnetic pressure wave in the hydrogen gas that will result the formation of a sound wave in the hydrogen with a wave length equal to the wavelength of the AC current that generates the sound wave pulse.
Alexander Parkhomov currently uses a 50 cycle sine wave. Rossi uses a more complicated pulsed waveform with a more rapid rise in voltage that would produce a more powerful acoustic wave.
This speculation regarding the shape of the input current waveform and the production of nanoparticles raises the possibility to allow a intelligent control circuit to control the LENR reaction by adjusting the production of hydride nanoparticles so that these nanoparticles are either stopped from forming to slow the reaction or to increase the strength of the reaction by adjusting the shape of the pulse to produce a more powerful acoustic wave in the hydrogen gas. This reaction control to support the power of the LENR reaction can be carried out while keeping the input power constant using an intelligent alternating current waveform generator.