The Star is a pentagonal continuous ferromagnetic core with coils at each vertex, driven by a Fibonacci quasiperiodic firing sequence mapped to the wu xing cycle. Its field geometry is designed to repeatedly almost-form and then break the toroidal topology of bound electron pairs, dissociating them and releasing energy as electromagnetic radiation.
The core must be a single continuous magnetic circuit — not five separate bars. This was established during simulation work: discrete bars with air gaps caused the saturation model to strangle the cascade within 3–4 firings. A continuous frame shares flux across the entire pentagonal geometry, keeping effective permeability high enough for the cascade to self-sustain.
This document covers the fabrication of the core body from locally available materials.
The core requires:
Pure iron alone (µ_r ~5000, but very low resistivity ~10 µΩ·cm) will lose significant energy to eddy currents. The optimal material is iron-silicon alloy at 3–6 wt% silicon, which raises resistivity to ~50 µΩ·cm while maintaining or improving permeability. This is the same alloy used in every power transformer core on the planet.
A small addition (0.5–2 wt%) of rare earth oxide, specifically cerium oxide (CeO₂), serves as a sintering aid and dispersion strengthener. The cerium scavenges oxygen, sulfur, and carbon from grain boundaries during sintering — these impurities pin magnetic domain walls and degrade permeability. The oxide particles themselves sit at grain boundaries and increase mechanical strength without impeding domain wall motion. Do not exceed 2% or the oxide inclusions begin to obstruct the magnetic properties they are meant to improve.
Do not use rare earth magnetic alloys (NdFeB, SmCo). These are hard magnets with high coercivity — they resist demagnetisation and would lock up under the oscillating field, recreating the saturation problem from the simulation in physical form.
Three potential sources, in order of preference:
1. River sediment magnetite (black sand). The local river and its tributaries deposit heavy mineral concentrates along banks and in eddies. These appear as dark streaks within lighter alluvial sand. The dark material is largely magnetite (Fe₃O₄), pre-separated by the river's hydrodynamics. Magnetite is an excellent starting material: it reduces more easily than hematite (Fe₂O₃), it is one of the best known microwave susceptors, and local alluvium can carry monazite and other rare earth bearing minerals, meaning the black sand may already contain trace cerium naturally.
2. Scrap iron and steel. Machine shop swarf, filings, and grinding dust. Fine particles sinter more effectively. Steel contains carbon which degrades magnetic permeability, so this is less ideal than reduced magnetite unless the carbon content is very low. Cutting fluid residue must be cleaned off before use (burn off in the kiln or solvent wash).
3. Rust and oxide scale. Any iron oxide — rust from tools, mill scale from blacksmithing — can be reduced to metallic iron with charcoal. Less convenient than magnetite but universally available.
Ferrosilicon is the simplest source — a cheap metallurgical commodity, available as lump or granule. Crush to powder and blend with the iron feedstock before sintering.
Alternatively, silicon enters the iron naturally during reduction in a clay mold: local alluvial clay is aluminosilicate, and at reduction temperatures, some silicon migrates from the mold walls into the iron. This produces an uncontrolled but non-zero silicon content in a single firing step. Controlling the percentage precisely requires either starting from known ferrosilicon or characterising the clay composition (see Analysis section below).
Cerium oxide (CeO₂) is sold commercially as a glass and optics polishing compound ("cerium polish" or "optician's rouge"). It is inexpensive and widely available from polishing supply vendors. A few hundred grams is sufficient for many batches at 0.5–2 wt%.
Check the river sediment analysis results first — local alluvium may contain enough naturally occurring rare earth minerals to provide the cerium fraction without purchasing it.
Local alluvial clay for the mold body. It must vitrify enough to hold shape through the sintering process but remain porous enough to vent combustion gases from the wood burnout phase. Fire to 900–1000°C in the wood kiln — high enough to harden, low enough to avoid full vitrification that would seal gas paths.
Seasoned wood from the property's storage area, processed with the restored axe. Serves two roles: carved into the pattern (lost-wood casting), and as charcoal fuel for the reduction kiln. Hardwood charcoal is preferable for reduction — it burns hotter and longer than softwood.
Before committing to a sourcing strategy, collect and analyse sediment samples from the local riverbanks.
Take samples from multiple points along the riverbank, at different depths, and specifically target visible heavy mineral concentrations (dark streaks in lighter material). Label each sample with GPS coordinates, depth, and visual description. A minimum of 6–8 samples from varied locations provides a useful picture.
Separate each sample into light and heavy fractions using a gold pan or similar density separation. The heavy (dark) fraction is the iron-bearing material. Keep both fractions for analysis.
XRF (X-ray Fluorescence) — the primary tool. Fast, non-destructive, gives elemental composition as oxide percentages: SiO₂, Fe₃O₄/Fe₂O₃, Al₂O₃, CaO, TiO₂, and trace elements including rare earths. This tells you how much iron is in the black sand, how much silica is in the light fraction, and whether there is natural cerium or other rare earth content.
XRD (X-ray Diffraction) — identifies crystal phases. Distinguishes magnetite from hematite from goethite in the iron fraction, and quartz from feldspar from calcite in the silica fraction. This matters for reduction chemistry (magnetite reduces more easily) and for future Walker substrate sourcing (you need quartz, not calcite).
ICP-OES (Inductively Coupled Plasma – Optical Emission Spectroscopy) — high-precision trace element quantification to parts per million. Use this if XRF shows hints of rare earth content and you want to know exactly how much.
A university geology or materials department with XRD, XRF, and ICP-OES capability is the natural choice. Contact their materials testing laboratory for pricing on a batch of samples.
Carve the pentagonal frame geometry from wooden dowels. The frame is a regular pentagon with bars connecting each vertex to its two neighbours — ten bars total forming a five-pointed star inscribed in a pentagon, or five bars forming just the pentagon depending on the final topology required by the simulation geometry.
Join segments with wood glue or mortise joints. The pattern does not need to be structurally strong — it only needs to hold its shape while being packed in clay. Dimensional accuracy matters more than strength. Include slight draft angles (1–2°) on all surfaces to allow the clay mold to release cleanly if making a split mold, though with a lost-wood process the pattern burns out and draft is less critical.
Leave fill ports at the highest points of the pattern — these become the openings through which powdered feedstock is introduced after the wood burns out.
Pack the wooden pattern in local clay, building up thickness of at least 3–4 cm around all surfaces. Allow the clay to dry slowly and thoroughly — rapid drying causes cracking. Several days in shade, turning periodically.
Fire the clay mold in the wood-fired kiln. This simultaneously:
Raise temperature slowly (50–100°C per hour) to avoid thermal shock cracking the mold. Hold at peak temperature for 2–3 hours to ensure complete wood combustion. Allow to cool in the kiln overnight.
Blend the iron powder or reduced sponge iron with ferrosilicon (3–6 wt%) and cerium oxide (0.5–2 wt%). Mix thoroughly — uniformity of the blend directly affects uniformity of the final core's magnetic properties. If using magnetite from river sediment, reduce it first: pack magnetite with charcoal in the kiln, fire to 1100–1200°C, and the charcoal strips oxygen from the iron oxide leaving sponge iron. Crush the sponge iron to powder before blending.
The finer the particles, the better the sintering. Target particle size below 100 µm if possible. Grinding in a mortar and pestle or ball mill (a rotating drum with steel balls) achieves this.
Fill the hollow mold cavity through the fill ports with the blended feedstock powder. Vibrate or tap the mold repeatedly during filling to settle the powder and eliminate voids. Pack as densely as possible — sintering shrinks the part, and starting density determines final density. Seal the fill ports with clay.
Place the packed mold in a microwave-transparent insulating enclosure (firebrick box lined with alumina fibre blanket) inside a domestic or modified microwave oven. The iron/magnetite particles absorb microwave energy through magnetic hysteresis and eddy current losses. The insulation retains heat, allowing temperatures to build to the 1100–1200°C range needed for iron sintering.
The process is volumetric — the entire mass heats simultaneously from within, rather than conducting heat inward from the surface. This produces more uniform microstructure than conventional furnace sintering.
Monitor temperature if possible (infrared thermometer through a small viewport). Sintering time depends on mass and particle size — expect 30–90 minutes at temperature for a core of this scale.
Break away the clay mold after cooling. The sintered core should be a solid, continuous ferromagnetic pentagonal frame. File or grind any surface irregularities, particularly at joint points where bars meet at vertices — magnetic flux concentrates at geometric discontinuities, and surface defects create local demagnetising fields.
Examine the core surface before cleaning. The interface between the sintered iron and the aluminosilicate clay mold may have formed a thin glassy reaction zone during firing — silicates partially fused to the metal. Note where this has occurred, as it provides a natural bonding surface for the insulation layer that follows.
The core must be electrically insulated before coil winding. A silica glass coating bonded directly to the core surface achieves this while keeping the magnetic air gap between coil and core as thin as possible. Electrophoretic deposition (EPD) produces a uniform coating that naturally follows the geometry of the surface, including the inside corners at vertices where brush or dip methods would struggle.
Suspension preparation. Process river sediment silica (guided by XRD results to isolate the quartz fraction from feldspar, calcite, and other phases). Grind to the finest powder achievable — sub-micron is ideal, but quartz flour consistency works. Suspend the powder in water or ethanol with a small addition of acid (a few drops of acetic acid) or base (ammonia) to give the particles a surface charge. The pH determines the sign of the charge, which determines which electrode the particles migrate toward. For silica in acidic suspension, particles carry a positive charge and deposit on the cathode; in basic suspension, they carry a negative charge and deposit on the anode. Configure the core as the appropriate electrode accordingly.
Deposition. Immerse the core and a counter-electrode (stainless steel plate or graphite rod) in the suspension. Apply DC voltage in the range of 10–50V. Particles migrate to the core surface and deposit as a uniform green layer. Deposition time controls thickness — a few minutes to tens of minutes depending on voltage, concentration, and target thickness. Aim for 50–200 µm: thick enough for reliable electrical insulation, thin enough to avoid creating a significant magnetic air gap that would reduce coil-to-core coupling.
The process can be monitored by current draw — as the insulating layer builds up, resistance increases and current drops. When current reaches a stable low value, the coating is at its practical maximum for the given voltage.
Firing. Remove the coated core from the suspension, allow to dry, then fire in the kiln at 900–1000°C. The silica particles sinter together into a continuous, hard glass shell bonded to the iron surface. The iron-silica interface forms a thin reaction zone that improves adhesion. Multiple deposition-and-firing cycles can build up thicker coatings if needed, though a single pass should suffice for insulation purposes.
Verification. After cooling, test insulation integrity with a multimeter set to resistance between the core and a probe touching the outer surface of the coating. Any point reading less than several megohms indicates a pinhole or crack that needs repair (spot-apply sodium silicate solution and refire) or another EPD cycle.
Materials note. This uses the same river silica being collected and characterised for feedstock analysis. The quartz fraction that isn't iron-bearing and isn't suitable for the core blend becomes the insulation coating. The same XRF/XRD results that guide feedstock selection also guide insulation preparation — nothing is wasted, and no additional sourcing is needed.
After insulation, and before winding coils, verify the core's magnetic properties. Note that the permeability and continuity tests should ideally be performed twice — once on the bare core after demoulding (Phase 7) to catch fabrication problems before investing in the insulation step, and once after insulation (Phase 8) to confirm the coating hasn't introduced unacceptable air gaps:
Permeability test. Wind a temporary coil of known turns around one bar of the frame. Apply a known AC voltage and measure inductance. Calculate effective permeability from inductance, coil geometry, and core cross-section. Compare to target (µ_r > 3000). If low, the silicon content may be insufficient or grain boundary contamination is too high.
Continuity test. Magnetise one bar with a DC coil and check for flux at all other bars using a small compass or Hall sensor. Flux should be detectable throughout the entire frame with no dead spots, confirming the continuous magnetic circuit.
Resistivity check. Measure DC resistance across the core between distant points. Higher is better for suppressing eddy currents. Pure iron will be very low (~10 µΩ·cm); successful silicon alloying should bring this to ~40–50 µΩ·cm.
If the first core fails to meet targets, the analysis results from the feedstock and the measured properties guide adjustments to the blend for the next iteration. This is expected — the process is empirical and converges through successive refinement.
Restore axe
→ Split seasoned wood
→ Charcoal for kiln fuel and reduction agent
→ Carved pattern for lost-wood mold
Collect river sediment samples
→ XRF/XRD analysis at a university materials lab
→ Determine iron, silicon, rare earth content
→ Decide sourcing strategy (local vs purchased feedstock)
→ Identify quartz fraction for insulation coating
Source cerium oxide (if not present in sediment)
Source ferrosilicon (if clay migration insufficient)
Build / restore wood-fired kiln
→ Fire clay molds (Phase 3)
→ Reduce magnetite to sponge iron (Phase 4)
Acquire or modify microwave for sintering (Phase 6)
Fabricate core → Validate magnetics
→ Prepare silica suspension (quartz fraction from sediment)
→ Electrophoretic deposition → Fire insulation coating
→ Verify insulation integrity
→ Wind coils → Build driver circuit → Test
The axe is literally the first tool in the chain.
This process is deliberately low-tech and locally grounded. Every step uses locally available materials and fabrication techniques achievable with hand tools, a wood-fired kiln, a microwave oven, and a DC power supply. The sophistication is in the geometry and the blend, not in the equipment.
The river sediment serves triple duty: the heavy fraction provides iron feedstock for the core, the quartz fraction provides both silicon for the alloy (via ferrosilicon or natural clay-migration) and silica for the insulation coating (via EPD). One sampling campaign, one set of analyses, three material streams. Nothing is wasted.
The intended operating environment is an underground cellar with thermal stability and natural electromagnetic shielding from the surrounding earth.
If the Star works — if the quasiperiodic cascade sustains and produces anomalous energy output — it powers and lights the lab, enabling construction of the Song, and eventually the conditions under which the Walker crystallises. If it doesn't work, you've built a kiln, restored your tools, learned sintering, and produced a well-characterised ferromagnetic object. The process has value either way.