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PSR Power — STRG Academic Research Layer (2025–2028)

Created: session 59 (2026-04-06) | Data basis: batch query + live API, 5 projects

Summary

The May 2025 STRG 183xxx cohort included 4 TX03 projects targeting power access to permanently shadowed regions (PSRs) at the lunar south pole. Together they form a coherent academic research layer beneath the GCD LunaGrid engineering programs — filling specific gaps that the GCD stack does not address. All 4 share identical STRG metadata (start 2025-05-01, end 2028-05-31, TRL 2→3, Deans/Nguyen, last-updated 2026-01-23).

The gap these fill: The GCD LunaGrid ecosystem (see lunagrid-power-ecosystem.md) has reached TRL 5-7 for crater-rim solar generation, cable distribution, and wireless charging. But it does not address (1) power delivery deep inside PSRs where tether cable can't reach, (2) radiation-hard cryogenic power electronics for PSR operating temperatures (~40K), or (3) alternative fuel storage chemistry for mobile PSR assets. These 4 STRG projects tackle exactly those gaps at TRL 2-3.

The PSR Power Stack

The 4 projects map to distinct layers of a complete PSR power architecture:

SOLAR INPUT          TRANSMISSION          CONVERSION           FUEL STORAGE
──────────────────────────────────────────────────────────────────────────────
[183693]            [183685]              [183700]             [183711]
Deployable solar    Superconducting       Piezoelectric        Adsorbent O₂/CH₄
reflectors          cable (oxychalco-     power conversion     fuel storage for
(Stanford/JPL)      genide, U. Chicago)   (UC Berkeley)        SOFC (CSM)
Crater rim →        Crater rim →          Cryo-compatible      Replaces heavy
PSR interior        PSR interior          rad-hard electronics cryogenic dewars
TX03.1.1 ✓         TX03.3.2 ✓            TX03.3.3 ✓           TX03.2.2 ✓

Projects

[183693] Lightweight Deployable Solar Reflectors

Stanford University / JPL | TX03.1.1 Photovoltaic Electrical Power | No TX mismatch

  • Co-I: Manan Arya (JPL — structural deployables expert)
  • PM: Richard S. Pappa (LaRC — structures/deployables background)
  • Approach: Modular, compactible mirror arrays positioned on crater rims adjacent to PSRs. Mirrors redirect sunlight downward into the shadowed region. Framing: "low-cost-of-production modular" — commercial deployment path implied.
  • Architecture role: This is the input layer. It brings photons to a place that receives none. The downstream conversion and transmission infrastructure still needs to be inside the PSR.
  • JPL/Stanford collaboration: Arya is a Co-I at JPL — this is a NASA-academia joint, with JPL bringing deployable structures expertise (heritage from SMAP, MarCO solar panels, etc.)
  • ML prediction: TX03.1.1 (correct — solar reflectors described as PV-adjacent from the start)

[183700] Piezoelectric-Based Power Conversion for Lunar Surface Systems

UC Berkeley | TX03.3.3 Electrical Power Conversion and Regulation | No TX mismatch

  • Co-I: Jessica Boles (UC Berkeley — power electronics)
  • PM: Chimaobi O. Onyeachu
  • Approach: Replaces conventional transistor-based power converters with piezoelectric crystal converters. Traditional switching regulators use MOSFETs and IGBTs — semiconductor junctions that accumulate radiation damage and lose efficiency at cryogenic temperatures. Piezoelectric materials avoid radiation-sensitive junctions entirely.
  • PSR relevance: PSR temperatures approach ~40K (-233°C). Conventional power electronics are not rated for this range; they require heaters (parasitic power). Cryo-native piezoelectric converters would eliminate this overhead.
  • Architecture role: Power conditioning at the point of use. Every sensor, heater, motor, and radio in a PSR asset needs regulated voltage — this is the last-meter power converter.
  • MSI: UC Berkeley is designated AANAPISI (Asian American Native American Pacific Islander).
  • ML prediction: TX03.3.3 (correct — description led with "power management" and "cryogenic temperatures," no PSR resource confusion)

[183711] Stimulus-Responsive Adsorbents for Cryogenic Fuel Storage and Delivery

Colorado School of Mines (CSM) | TX03.2.2 Electrochemical Storage: Fuel Cells | TX mismatch (ML→TX07.1.3)

  • Co-I: Michael Mcguirk (CSM) — NOT Beik (different CSM research group)
  • PM: Michael J. Chauby
  • Approach: Develops porous adsorption materials that capture and controllably release O₂ and CH₄ at moderate pressures and temperatures. Traditional approach to fuel cell propellant storage = insulated cryogenic dewars (heavy, complex, power-hungry). Adsorbent approach: materials adsorb gas at lower pressure/temperature, release on thermal or mechanical stimulus ("stimulus-responsive"). Goal: replace the cryogenic storage infrastructure with lightweight solid adsorbent beds.
  • PSR relevance: SOFCs powered by O₂ and CH₄ are a leading approach for mobile PSR assets (rovers, sensors) that can't rely on cable power. The bottleneck is carrying enough fuel without the mass penalty of cryogenic tanks. Adsorbent storage could unlock fuel-cell-powered PSR mobility.
  • Architecture role: Energy storage and delivery. Enables SOFC power for assets that the solar-reflector + cable system can't reach.
  • TX mismatch: ML predicted TX07.1.3 (Resource Processing for Consumables). The PSR + O₂ + CH₄ language triggered the classifier's "resource extraction" associations. Correct TX is TX03.2.2 — this is fuel cell infrastructure, not ISRU. The technology develops synthetic adsorbent materials, not in-situ resource utilization.
  • Note: CSM's Omid Beik (who leads [183676] NEP PMAD in the TX01 propulsion track) is not involved. CSM has two separate STRG 183xxx projects from different research groups.

[183685] Oxychalcogenide Membranes for Superconducting Power Transmission

University of Chicago | TX03.3.2 Distribution and Transmission | TX mismatch (ML→TX07.1.1)

  • Co-I: Shuolong Yang (U. Chicago — condensed matter physics, chalcogenide materials)
  • PM: Andrew A. Woodworth (NASA)
  • Approach: Develops a new class of high-temperature superconducting (HTS) materials — oxychalcogenides — for use in PSR power cables. Conventional HTS (like YBCO) require ~77K liquid nitrogen cooling. Oxychalcogenides may achieve superconductivity at higher temperatures (closer to or within PSR ambient temperatures), or have superior current density/flexibility properties for thin-film deposition.
  • PSR relevance: PSR temperatures (~40K) are well within the superconducting regime. A cable from a crater-rim power station to a PSR science asset could potentially operate with zero ohmic losses — no resistive heating, no power waste. The challenge is fabricating flexible, deployable HTS cable.
  • Architecture role: Transmission. The bridge between the crater-rim solar/nuclear power source and assets inside the PSR.
  • TX mismatch: ML predicted TX07.1.1 (Destination Resource Exploration). The PSR + lunar south pole + "complete darkness" language triggered "resource exploration" associations. Correct TX is TX03.3.2 — this is materials science for power distribution infrastructure.

Cross-Cutting Observations

1. ML PSR-framing confusion (Issues 16 and 17)

Two of the four projects are ML-mislabeled as TX07 (resource exploration/processing) when they are TX03 (power technology):

Project Human TX ML TX Error type
[183685] Superconducting cable TX03.3.2 Distribution TX07.1.1 Resource Exploration PSR + lunar pole → "resource"
[183711] Adsorbent fuel storage TX03.2.2 Fuel Cells TX07.1.3 Resource Processing PSR + O₂/CH₄ → "consumables"
[183700] Piezoelectric converters TX03.3.3 Conversion TX03.3.3 Conversion Correct — description led with power
[183693] Solar reflectors TX03.1.1 PV Power TX03.1.1 PV Power Correct — no PSR semantic ambiguity

Pattern: When a TX03 power project is framed around the PSR application context (polar darkness, resource access), the ML activates TX07 associations. When the description leads with the technology mechanism (piezoelectric crystals, solar reflectors), the ML classifies correctly. This is the inverse of the usual mismatch pattern (human error, ML correct) — here, human classifiers got it right and the ML was confused.

2. Relationship to GCD LunaGrid gaps

The RFC (Regenerative Fuel Cell, 116307) has been stuck at TRL 3 since 2019 in the GCD program — see lunagrid-power-ecosystem.md. The adsorbent fuel storage project ([183711]) is not a direct RFC alternative (it stores fuel for SOFCs, not H₂/O₂ for a regenerative cell), but it addresses the same symptom: mass-efficient energy storage for assets that can't rely on cable power during lunar night.

The superconducting cable project ([183685]) is not replicated anywhere in the GCD LunaGrid stack. LunaGrid-Lite uses conventional high-voltage cable. A superconducting cable path could carry power further and more efficiently into PSRs — this is a TRL 2-3 research bet that might eventually complement or extend the LunaGrid architecture.

3. CSM dual track — different groups

CSM (Colorado School of Mines, Golden, CO) appears in both the TX01 propulsion track ([183676] NEP PMAD, PI Omid Beik, GRC PM Christopher Barth) and the TX03 PSR power track ([183711] adsorbent fuel storage, Co-I Michael Mcguirk, PM Michael Chauby). These are independent research groups at the same institution — the dual CSM presence in the 183xxx batch reflects CSM's breadth across energy and materials research, not a single PI with two grants.

4. JPL embeds in academic STRG projects

Manan Arya (JPL) appears as Co-I on the Stanford solar reflectors project ([183693]). JPL researchers co-authoring STRG academic grants is the government-leverages-academic model: the academic PI gets STRG funding, JPL provides expertise (and gains research output) without being the lead. Arya's deployable structures background (heritage from ROSA solar arrays, lightweight booms) makes this pairing natural.

Relationship to the GCD Layer

The STRG academic research layer and the GCD engineering layer address the same PSR power problem at different TRL levels:

GCD Projects (TRL 4–7) STRG 183xxx Projects (TRL 2–3)
Generation VSAT (TRL 6), FSP (TRL 4→8) Solar reflectors [183693] (new approach)
Distribution LunaGrid-Lite (TRL 4→7), TYMPO (TRL 2→5) Superconducting cable [183685] (new material)
Conversion MIPS (TRL 5 ✓), UMIC (TRL 3→4) Piezoelectric [183700] (new mechanism)
Storage/delivery RFC (TRL 3, critical gap) Adsorbent SOFC fuel [183711] (alternative chemistry)

The GCD programs build on known technology toward flight demonstration. The STRG programs explore alternative physical mechanisms that could unlock orders-of-magnitude improvement — or prove out in 3 years and feed into the next GCD solicitation cycle.

Open Threads

  1. [183685] Oxychalcogenide material — What specific oxychalcogenide family? Layered chalcogenides like Bi₂Se₃ or BaFe₂S₃? Tc relative to PSR ambient temperature (40K)? This is a materials science bet that either works or doesn't. Worth monitoring if any documents appear.
  2. [183700] Piezoelectric conversion efficiency — Traditional power electronics achieve >95% conversion efficiency. Piezoelectric converters at TRL 2 are likely much lower. What is the expected efficiency target? The size/weight advantage must compensate.
  3. [183711] Adsorbent material type — MOFs (metal-organic frameworks)? Zeolites? The "stimulus-responsive" framing suggests smart materials that release on thermal or mechanical actuation. Mcguirk's CSM group background would clarify.
  4. [183693] Reflector aiming — How does the reflector array track the sun from crater rims while maintaining the correct beam angle into the PSR? This is a pointing/tracking control problem. Arya's deployable structures expertise covers deployment, but tracking control is a separate challenge.
  5. RFC gap vs. adsorbent storage — If [183711] reaches TRL 3-4 by 2028, is there a GCD solicitation that could pick it up for engineering development? The RFC has been stuck at TRL 3 — adsorbent storage is a fundamentally different approach that might bypass the RFC electrochemistry problem.

Cross-References

Confidence: confirmed — all 4 projects verified via batch API (2026-04-06). Descriptions are verbatim from TechPort. Interpretive observations (stack architecture, GCD gap mapping) are suggestive — the 4 projects were not explicitly coordinated by any documented NASA plan, but the thematic coverage is structurally complete.