25 lines
4.0 KiB
JSON
25 lines
4.0 KiB
JSON
{
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"step_id": "validate",
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"agent": "tech-lead",
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"status": "complete",
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"result": "VERIFIED WITH CAVEATS. The stated CTE of 0 \u00b1 30 ppb/\u00b0C (0 \u00b1 0.03 \u00d7 10\u207b\u2076/\u00b0C) for Corning ULE 7972 over 5\u201335\u00b0C is accurate and consistent with Corning's published specifications. The source URL (spacematdb.com) hosts a legitimate copy of the Corning datasheet dated August 2006. Key concerns and missing context: (1) The \u00b130 ppb/\u00b0C is the SPECIFICATION LIMIT, not a measurement \u2014 actual blanks are graded and can be much tighter (e.g., Grade A: 0 \u00b1 10 ppb/\u00b0C in the critical zone). For precision applications, specify the grade. (2) The 5\u201335\u00b0C range is the standard qualification range. Outside this range, CTE behavior is parabolic \u2014 ULE has a crossover temperature (typically ~20\u00b0C) where CTE = 0, and CTE grows quadratically away from it. For cryogenic or elevated-temperature use, this spec does NOT apply. (3) CTE homogeneity varies through the boule \u2014 radial and axial CTE gradients exist and matter for large optics. The datasheet addresses this via critical-zone vs. non-critical-zone specifications. (4) The 2006 datasheet is superseded by newer revisions \u2014 recommend confirming against current Corning literature, though the fundamental CTE spec has remained stable. (5) For FEA modeling: use the actual measured CTE of your specific blank if available, not just the spec range. The \u00b130 ppb/\u00b0C envelope is too wide for high-fidelity thermal distortion analysis.",
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"notes": "CTE value verified from domain knowledge and source document. Primary caveat: the \u00b130 ppb/\u00b0C is a spec envelope, not a point value \u2014 engineering use requires knowing whether you need the spec limit or a measured value for a specific blank/grade.",
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"run": {
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"schemaVersion": "1.0",
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"runId": "orch-1771178697-ea346f4d",
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"agent": "tech-lead",
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"status": "complete",
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"result": "VERIFIED WITH CAVEATS. The stated CTE of 0 \u00b1 30 ppb/\u00b0C (0 \u00b1 0.03 \u00d7 10\u207b\u2076/\u00b0C) for Corning ULE 7972 over 5\u201335\u00b0C is accurate and consistent with Corning's published specifications. The source URL (spacematdb.com) hosts a legitimate copy of the Corning datasheet dated August 2006. Key concerns and missing context: (1) The \u00b130 ppb/\u00b0C is the SPECIFICATION LIMIT, not a measurement \u2014 actual blanks are graded and can be much tighter (e.g., Grade A: 0 \u00b1 10 ppb/\u00b0C in the critical zone). For precision applications, specify the grade. (2) The 5\u201335\u00b0C range is the standard qualification range. Outside this range, CTE behavior is parabolic \u2014 ULE has a crossover temperature (typically ~20\u00b0C) where CTE = 0, and CTE grows quadratically away from it. For cryogenic or elevated-temperature use, this spec does NOT apply. (3) CTE homogeneity varies through the boule \u2014 radial and axial CTE gradients exist and matter for large optics. The datasheet addresses this via critical-zone vs. non-critical-zone specifications. (4) The 2006 datasheet is superseded by newer revisions \u2014 recommend confirming against current Corning literature, though the fundamental CTE spec has remained stable. (5) For FEA modeling: use the actual measured CTE of your specific blank if available, not just the spec range. The \u00b130 ppb/\u00b0C envelope is too wide for high-fidelity thermal distortion analysis.",
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"artifacts": [],
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"confidence": "high",
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"notes": "CTE value verified from domain knowledge and source document. Primary caveat: the \u00b130 ppb/\u00b0C is a spec envelope, not a point value \u2014 engineering use requires knowing whether you need the spec limit or a measured value for a specific blank/grade.",
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"timestamp": "2026-02-15T13:05:00-05:00",
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"latencyMs": 33777,
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"workflowRunId": "wf-1771178662-8433f771",
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"stepId": "validate",
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"exitCode": 0
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},
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"started_at": "2026-02-15T18:04:57.733555+00:00",
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"finished_at": "2026-02-15T18:05:31.640599+00:00",
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"duration_s": 33.907
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} |