If you are not concerned with a narrow broad band, you could use a blackbody emission. According to Wien's displacement law, 14.8THz to 22.5THz,
http://en.wikipedia.org/wiki/Wien%27s_displacement_law#Frequency-dependent_formulation gives 251K to 387K. So, a resistive heater would give you the upper band and for the lower band, you'd need a Terahertz source: http://en.wikipedia.org/wiki/Terahertz_radiation Like this one: http://en.wikipedia.org/wiki/Backward_wave_oscillator 2012/4/5 Abd ul-Rahman Lomax <[email protected]> > I've been looking at: > > Letts, D. and P.L. Hagelstein. Stimulation of Optical Phonons in > Deuterated Palladium. in ICCF-14 International > Conference on Condensed Matter Nuclear Science. 2008. Washington, DC. > > http://lenr-canr.org/acrobat/**LettsDstimulatio.pdf<http://lenr-canr.org/acrobat/LettsDstimulatio.pdf> > > This work has not received adequate attention. > > There is more at > http://www.iscmns.org/CMNS/**JCMNS-Vol3.pdf<http://www.iscmns.org/CMNS/JCMNS-Vol3.pdf>-- > page 59 et seq. (PDF page 65) > > Summary: > > A cathode of palladium foil is prepared, according to a protocoal which > Letts has found has high success at producing excess heat. The cathode is > loaded to perhaps 85% (?), then an alternate anode of gold is energized, > and gold is thus plated onto the cathode. Electrolysis power is maintained > after the loading period and through the experiment. > > The cathode is illuminated at a spot with two lasers, tuned to produce > beat frequencies in the range of 3-22 THz. > > Many experimental issues remain to be explored. However, aside from some > unlikely possibilities, it appears that there is a strong response to > stimulation, such that when there is, under the experimental conditions, no > laser stimulation, or stimulation off-resonance, there is little or no XP. > The response appears to be quantitatively predictable. Further, that there > would be such a response was predicted from theory by Hagelstein. However, > it is not my purpose here to go into the Hagelstein's theory and its > implications, except to note that this work may be helping to elucidate > conditions under which cold fusion takes place. It is the level of control > that is important. > > (One of the problems in the field is that there may be alternate > conditions, there is not necessarily just one mechanism. We need to keep > that in mind. For example, the Letts work generally involves using a strong > magnetic field, whereas other work shows XP without a strong field. On the > other hand, perhaps only a weak field is needed! Such as that of the earth. > Field orinetation might matter! One of the avenues of approach here is to > explore the effect across a range of magnetic field strengths and > orientations. Obviously, as well, laser stimulation is not a necessary > cause of XP under all conditions. The Letts cells may be, I can speculate, > held at a loading level under that where the normal FPHE arises; but the > THz stimulation shoves them into activity.) > > In order to replicate this work, THz stimulation is required. To do it as > Letts did it is expensive. > > How can stimulation, perhaps at 14.8 THz or 21.78 THz, be arranged? It may > be possible to obtain inexpensive laser diodes chosen in pairs to produce > these frequencies, or close enough. (How close is necessary is a matter to > be explored). The power need not be high, there are signs that the > triggering threshold may be below 1 mW per laser. It may be possible to > tune inexpensive diodes by controlling their temperature, over a limited > range. > > Filters in the THz region might also be obtained or fabricated. > > For general interest, I'll add some results of prior discussion. The gold > deposit appears to be necessary for laser stimulation to have an effect. It > is that layer, perhaps, that mixes the two laser frequencies, producing the > effective beat frequency. > > Plans are underway to analyze cell atmosphere and used cathodes for > helium, and, at least at first, this could be an important aspect of this > work. There is speculation that the resonance above 20 THz is due to > hydrogen, and so the product from that stimulation might not be helium! It > is conceivable that the cathode design with a gold deposit traps helium, > better than an open cathode would. If so, full analysis of the cathode > might reveal a great deal of information about reaction site as well as, > perhaps, better determination of reaction Q (heat/helium) than has > previously been obtained. > > Any brainstorming, especially informed, on how to generate the THz > stimulation will be appreciated. My goal, generally, has been to lower the > entry cost for doing important cold fusion experimental work. > > -- Daniel Rocha - RJ [email protected]
