{
  "schemaVersion": "1.0",
  "runId": "orch-1771168991-4baf8c6a",
  "agent": "webster",
  "status": "complete",
  "result": "Here are the main differences between Zerodur and Clearceram-Z HS for astronomical mirror substrates:\n\n*   **CTE Uniformity:** Zerodur generally offers tighter catalog extremes (e.g., Class 0 EXTREME at 0 ± 0.007 ppm/K) with guaranteed homogeneity, whereas Clearceram-Z HS is specified slightly looser (0.0 ± 0.020 ppm/K) but demonstrates excellent large-blank consistency and lot-to-lot reproducibility.\n*   **Polishing & Workability:** Both achieve sub-nanometer roughness (Clearceram-Z HS reports ~0.15 nm RMS). Clearceram-Z HS emphasizes reduced microcrack propagation during machining, which can improve yield for complex lightweighted structures.\n*   **Long-Term Stability:** Zerodur has a longer history of published multi-decade mechanical reliability data (tens of years under stress). Clearceram-Z HS highlights strong thermal/chemical process stability (e.g., minimal change after 650°C heat treatment) but has less public long-term drift data.",
  "artifacts": [],
  "confidence": "high",
  "notes": "Both materials are top-tier glass-ceramics. Zerodur is the legacy standard with more historical data; Clearceram-Z HS is a strong competitor with excellent machinability and thermal stability.",
  "timestamp": "2026-02-15T10:25:00-05:00"
}