Prior Art Cluster 01 Navy Pd/D Co-Deposition (SPAWAR) and China Lake Calorimetry

Records

Record note: the CR-39 track interpretation received a published comment by L. Kowalski (The European Physical Journal Applied Physics 44(3), 287-290, 2008; DOI 10.1051/epjap:2008161) and an authors' response (44(3), 291-295, 2008; DOI 10.1051/epjap:2008182). Both are part of the record; the response adds spacer data in support of the original assignment.

Narrative

The Navy line begins at SPAWAR San Diego, where Stan Szpak and Pamela Mosier-Boss inverted the Fleischmann-Pons geometry: instead of loading a bulk palladium rod for days, they grow the palladium and load it with deuterium at the same time, co-depositing palladium from a bath of palladium chloride and lithium chloride in heavy water while deuterium evolves at the cathode. The electrode is always fresh, always expanding, and never needs a long charge-up. This one idea made the phenomenon addressable by any laboratory with a beaker, a power supply and discipline, and it is the direct ancestor of our own plan to run freshly loaded hydride particles inside the working fluid.

Melvin Miles at the China Lake naval laboratory carried the calorimetry side. His 1993 paper pairs every deuterium cell with a light-water cell and reports excess power only on the deuterium side, together with helium-4 in the gas headspace at the 1e11 atoms per second per watt scale. He then joined the SPAWAR group and put co-deposition electrodes into Fleischmann-Pons class Dewar calorimeters (1999, 2004). The group's summaries emphasize reproducibility of the heat signal, infrared images of hot spots on the cathode, and thermal instabilities that the authors call mini-explosions. In one paper the birth and death of hot spots is tracked by infrared imaging while a piezoelectric substrate glued to the electrode registers voltage spikes at the same moments, which is, for our purposes, a lovely precedent: a piezo element doubling as an event sensor.

The nuclear-product record grew in stages: tritium (1998, sporadic, 1e3 to 1e4 atoms per second), then CR-39 track foils pressed against the cathode under external electric and magnetic fields (2005 to 2010), with the triple-track carbon-breakup signature offered as a neutron fingerprint and calibrated against a deuterium-tritium generator. Independent work exists: the 2017 JCNS replication reports excess alpha-track density in two of four runs. The field also produced a published exchange on track interpretation (Kowalski 2008 and the authors' response), which is precisely why our device carries time-of-flight neutron counters alongside CR-39: two independent detector classes that must agree before we call anything.

The operational signature across fifteen years of records is sporadicity. Heat, tritium and tracks arrive in bursts separated by quiet periods, and the reported loadings sit near the electrochemical limit of about D/Pd 0.7 to 1 (field-wide figure). A device that expects bursts needs long runs, time-stamped logging on every channel, and thermal headroom for positive-feedback excursions.

Carry into device

• Adopt the co-deposition principle as our in-situ loading fallback: reference bath 0.05 M palladium chloride plus 0.3 M lithium chloride in D2O, plated onto substrate grains or screens, to grow fresh, defect-rich PdD immediately before a run if pre-loaded powder ages.
• Copy the paired-control discipline: every deuterated configuration runs its hydrogen analog in the same fixture, the way China Lake paired D2O with H2O cells; helium-4 headspace assay with a mass spectrometer at the 1e11 atoms per second per watt yardstick.
• CR-39 foils in open-and-masked pairs plus spacer stacks, pressed against the suspension vessel, with a deuterium-tritium generator calibration set of the kind used in the 2010 comparison; track reading by the automated LET workflow of the 2017 method paper.
• Infrared imaging of the active volume plus piezo-wafer spike listening: our suspension already contains piezoelectric grains, so we read the same grains as event sensors, following the SPAWAR mini-explosion readout.
• Dewar and isoperibolic calorimeters in redundant combination, with the cell simulated numerically before construction (the ICARUS precedent of Technical Report 1862).
• Design for sporadic, burst-like kinetics: multi-day runs, burst-tolerant time-stamped data capture on all channels, and power supplies rated for the positive-feedback excursions the record describes.
• Expect loading near D/Pd 0.7 to 1 for electrochemical palladium and do not plan beyond it; our titanium and zirconium deuterides are there to raise deuteron density instead.