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< title > GigaBIT M1 — Critical Design Review< / title >
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< / style >
< / head >
< body >
< div class = "reveal" >
< div class = "slides" >
<!-- ===== TITLE ===== -->
< section class = "title-slide" data-background-gradient = "linear-gradient(135deg, #0b0f14 0%, #111827 50%, #0b0f14 100%)" >
< h1 style = "color:white;" > GigaBIT M1 Primary Mirror< / h1 >
< div class = "subtitle" > Critical Design Review< / div >
< hr style = "border:none; height:2px; background:rgba(125,211,252,0.25); width:40%; margin:0.6em auto;" >
< div class = "meta" >
< p > Optiques Fullum & Atomaste Solution< / p >
< p > January 2026< / p >
< p style = "margin-top:1em; font-size:0.85em;" > Presented to StarSpec< / p >
< / div >
< / section >
<!-- ===== AGENDA ===== -->
< section >
< h2 > Agenda< / h2 >
< div style = "text-align:left; max-width:600px; margin:0 auto;" >
< ol style = "font-size:0.75em; line-height:2;" >
< li class = "fragment fade-up" > CDR Objectives & Scope< / li >
< li class = "fragment fade-up" > M1 Design Overview< / li >
< li class = "fragment fade-up" > Support System Architecture< / li >
< li class = "fragment fade-up" > Optimization & Cost Reduction Campaign< / li >
< li class = "fragment fade-up" > Selected Design — Option B Performance< / li >
< li class = "fragment fade-up" > Recent Development: Refined Contact Model< / li >
< li class = "fragment fade-up" > Boundary Condition Strategy< / li >
< li class = "fragment fade-up" > Reference Frame — Scope & Requirements< / li >
< li class = "fragment fade-up" > Risk Assessment< / li >
< li class = "fragment fade-up" > Path Forward & Recommendation< / li >
< / ol >
< / div >
< / section >
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<!-- ===== CDR OBJECTIVES ===== -->
< section >
< h2 > CDR Objectives< / h2 >
< div class = "highlight-box" >
< p style = "font-size:0.8em; font-weight:600;" > Goal: Establish design maturity sufficient to authorize blank procurement from Schott.< / p >
< / div >
< br >
< div style = "text-align:left; max-width:650px; margin:0 auto;" >
< ol style = "font-size:0.68em; line-height:1.8;" >
< li class = "fragment fade-up" > Validate M1 design meets optical & mechanical requirements< / li >
< li class = "fragment fade-up" > Document cost reduction campaign & trade-off analysis< / li >
< li class = "fragment fade-up" > Present final design selection with supporting data< / li >
< li class = "fragment fade-up" > Define support system architecture & reference frame concept< / li >
< li class = "fragment fade-up" > Establish procurement path & timeline< / li >
< / ol >
< / div >
< br >
< p style = "font-size:0.6em; color:rgba(232,238,247,0.5);" > Scope: M1 blank design + support system architecture.< br >
Reference frame detailed design & STOP analysis → FDR phase.< / p >
< / section >
<!-- ===== M1 DESIGN OVERVIEW ===== -->
< section >
< h2 > M1 Mirror Blank — Design Overview< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/components/M1-Blank/hero.png" class = "slide-img" alt = "M1 Blank" >
< div class = "caption" > M1 blank — lightweighted back face with honeycomb rib structure< / div >
< / div >
< div style = "text-align:left;" >
< h3 > Optical Prescription< / h3 >
< table >
< tr > < td > < b > Surface< / b > < / td > < td > Near-parabolic (k = − < / td > < / tr >
< tr > < td > < b > Radius of curvature< / b > < / td > < td > 2893.6 mm ± 3 mm< / td > < / tr >
< tr > < td > < b > Clear aperture< / b > < / td > < td > 1202 mm< / td > < / tr >
< tr > < td > < b > Material< / b > < / td > < td > ZERODUR Class 0< / td > < / tr >
< / table >
< h3 style = "margin-top:0.6em;" > Option B Geometry< / h3 >
< table >
< tr > < td > < b > Back face angle< / b > < / td > < td > 4.01°< / td > < / tr >
< tr > < td > < b > Center thickness< / b > < / td > < td > 85 mm< / td > < / tr >
< tr > < td > < b > Mass< / b > < / td > < td > 95.81 kg< / td > < / tr >
< tr > < td > < b > Support bosses< / b > < / td > < td > 54 (30 mm Ø)< / td > < / tr >
< / table >
< / div >
< / div >
< / section >
<!-- ===== M1 WITH SUPPORT ===== -->
< section >
< h2 > M1 Assembly< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/components/M1-Blank/with-vertical-iso.png" class = "small-img" alt = "M1 with vertical support" >
< div class = "caption" > M1 with 54-point whiffletree support< / div >
< / div >
< div >
< img src = "./assets/components/Full-Assembly/isometric.png" class = "small-img" alt = "Full assembly" >
< div class = "caption" > Full M1 assembly — blank + supports + reference frame< / div >
< / div >
< / div >
< / section >
<!-- ===== SUPPORT SYSTEM ===== -->
< section >
< h2 > Support System Architecture< / h2 >
< div class = "two-col" >
< div style = "text-align:left;" >
< h3 > Vertical Support — 54-Point Whiffletree< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > 3-stage hierarchy (18 contact points × < / li >
< li class = "fragment fade-up" > Carbon fiber plates for thermal isolation< / li >
< li class = "fragment fade-up" > RDOF joints: 150 Nm·m stiffness (negligible WFE impact)< / li >
< li class = "fragment fade-up" > Spherical joints for self-alignment< / li >
< / ul >
< h3 style = "margin-top:0.6em;" > Lateral Support — 3-Point System< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > Roll restraint ±7.5°< / li >
< li class = "fragment fade-up" > Low-friction sliding interface (Teflon-like)< / li >
< li class = "fragment fade-up" > Minimizes parasitic frame distortion transfer< / li >
< li class = "fragment fade-up" > Parameterized pivot positions (inner/outer/middle)< / li >
< / ul >
< / div >
< div >
< img src = "./assets/components/Vertical-Support/isometric.png" class = "small-img" alt = "Vertical support isometric" >
< div class = "caption" > Vertical support — whiffletree isometric view< / div >
< br >
< img src = "./assets/components/Lateral-Support/detail.png" class = "thumb" alt = "Lateral support" >
< div class = "caption" > Lateral support detail< / div >
< / div >
< / div >
< / section >
<!-- ===== SUPPORT SYSTEM DETAILS ===== -->
< section >
< h2 > Support System — Detail Views< / h2 >
< div class = "three-col" >
< div >
< img src = "./assets/components/Vertical-Support/stage-1.png" class = "thumb" alt = "Stage 1" >
< div class = "caption" > Stage 1 — Pads< / div >
< / div >
< div >
< img src = "./assets/components/Vertical-Support/stage-2.png" class = "thumb" alt = "Stage 2" >
< div class = "caption" > Stage 2 — Intermediate lever< / div >
< / div >
< div >
< img src = "./assets/components/Vertical-Support/stage-3.png" class = "thumb" alt = "Stage 3" >
< div class = "caption" > Stage 3 — Frame interface arm< / div >
< / div >
< / div >
< br >
< div class = "two-col" >
< div >
< img src = "./assets/components/Vertical-Support/spherical-joint.png" class = "thumb" alt = "Spherical joint" >
< div class = "caption" > Spherical joint — self-alignment< / div >
< / div >
< div >
< img src = "./assets/components/Stage-3-Arm/detail.png" class = "thumb" alt = "Stage 3 arm" >
< div class = "caption" > Stage 3 arm — connection detail< / div >
< / div >
< / div >
< / section >
<!-- ===== REFERENCE FRAME ===== -->
< section >
< h2 > Reference Frame — Concept< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/components/Reference-Frame/hero.png" class = "small-img" alt = "Reference frame" >
< div class = "caption" > CFRP reference frame concept< / div >
< / div >
< div >
< img src = "./assets/components/Reference-Frame/top.png" class = "small-img" alt = "Reference frame top" >
< div class = "caption" > Top view — interface point layout< / div >
< / div >
< / div >
< br >
< div class = "highlight-box" >
< p style = "font-size:0.65em;" > Conceptual design provided by Optiques Fullum as a < b > good-faith proposal< / b > to facilitate integration. Detailed design & manufacturing = StarSpec responsibility.< / p >
< / div >
< / section >
<!-- ===== OPTIMIZATION CAMPAIGN ===== -->
< section >
< h2 > Optimization Campaign — Scale< / h2 >
< div class = "metric-row" >
< div class = "metric-card blue" > < div class = "value" > 3,770+< / div > < div class = "label" > FEA Simulations< / div > < / div >
< div class = "metric-card" > < div class = "value" > 14< / div > < div class = "label" > Design Variables< / div > < / div >
< div class = "metric-card" > < div class = "value" > 5< / div > < div class = "label" > Algorithms Tested< / div > < / div >
< div class = "metric-card green" > < div class = "value" > Confirmed< / div > < div class = "label" > Convergence< / div > < / div >
< / div >
< br >
< table >
< thead >
< tr > < th > Campaign< / th > < th > FEA Trials< / th > < th > Algorithms< / th > < th > Focus< / th > < / tr >
< / thead >
< tbody >
< tr > < td > Adaptive Support< / td > < td > ~1,400< / td > < td > GNN+TuRBO, TPE, NSGA-II< / td > < td > Support position optimization< / td > < / tr >
< tr > < td > Cost Reduction< / td > < td > ~900< / td > < td > TPE, CMA-ES< / td > < td > Geometry simplification< / td > < / tr >
< tr > < td > Flat Back Exploration< / td > < td > 1,470< / td > < td > TPE, SAT v3, L-BFGS< / td > < td > Manufacturing trade study< / td > < / tr >
< / tbody >
< / table >
< br >
< div class = "success-box" >
< p style = "font-size:0.65em;" > ✅ Design space thoroughly explored. Multiple algorithms converge to same solution.< / p >
< / div >
< / section >
<!-- ===== ATOMIZER FRAMEWORK ===== -->
< section >
< h2 > Atomizer — Custom Optimization Framework< / h2 >
< div style = "text-align:left; max-width:650px; margin:0 auto;" >
< h3 > Evolution since PDR< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > Transitioned from HEEDS MDO → < b > Atomizer< / b > (fully custom)< / li >
< li class = "fragment fade-up" > Full control over algorithm selection & tuning< / li >
< li class = "fragment fade-up" > < b > OPD-based Zernike extraction< / b > — accounts for lateral (X,Y) displacement, not just axial (Z)< / li >
< li class = "fragment fade-up" > Complete traceability through version-controlled studies< / li >
< / ul >
< h3 style = "margin-top:0.6em;" > Key Algorithms< / h3 >
< ul style = "font-size:0.65em;" >
< li > < b > TPE< / b > — Bayesian optimization baseline< / li >
< li > < b > GNN Surrogate< / b > — Graph Neural Network (~0.95 R² on Zernike coefficients)< / li >
< li > < b > SAT v3< / b > — Self-Aware TuRBO with adaptive exploration schedule< / li >
< li > < b > L-BFGS< / b > — Gradient-based polish for final refinement< / li >
< / ul >
< / div >
< / section >
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<!-- ===== COST REDUCTION ===== -->
< section >
< h2 > Cost Reduction Campaign< / h2 >
< div class = "highlight-box" >
< p style = "font-size:0.7em;" > < b > Problem:< / b > Schott quote $625K vs. $523K budget → $102K gap to close< / p >
< / div >
< br >
< div class = "two-col" >
< div style = "text-align:left;" >
< h3 > Strategy 1: Geometry Simplifications< / h3 >
< table >
< tr > < th > Modification< / th > < th > Impact< / th > < th > Verdict< / th > < / tr >
< tr > < td > Remove structural ribs< / td > < td > +92% WFE< / td > < td style = "color:var(--accent);" > ✗ Rejected< / td > < / tr >
< tr > < td > Support cone → 0°< / td > < td > +3.3%< / td > < td style = "color:var(--accent2);" > ✓ Acceptable< / td > < / tr >
< tr > < td > Remove center mini ribs< / td > < td > < b > − < / b > < / td > < td style = "color:var(--accent2);" > ✓ Recommended< / td > < / tr >
< tr > < td > Center thickness 85→80< / td > < td > +8.2%< / td > < td style = "color:var(--accent);" > ✗ Rejected< / td > < / tr >
< / table >
< / div >
< div style = "text-align:left;" >
< h3 > Strategy 2: Flat Back Variant< / h3 >
< ul style = "font-size:0.65em;" >
< li > Eliminates taper machining entirely< / li >
< li > No jig required< / li >
< li > 1,470 FEA trials across 10 versions< / li >
< li > 49% improvement in MFG deformation< / li >
< li > Mass trade-off: +16 kg< / li >
< / ul >
< / div >
< / div >
< br >
< div class = "success-box" >
< p style = "font-size:0.65em;" > ✅ Campaign closed the cost gap. Option B: $525K (+0.4% of budget). Option C: $520K.< / p >
< / div >
< / section >
<!-- ===== KEY FINDING ===== -->
< section >
< h2 > Key Finding — Structural Ribs Are Non-Negotiable< / h2 >
< div style = "text-align:left; max-width:650px; margin:0 auto;" >
< p style = "font-size:0.72em;" > The sensitivity analysis revealed a < b > critical design hierarchy< / b > :< / p >
< table >
< thead > < tr > < th > Rank< / th > < th > Parameter< / th > < th > Sensitivity< / th > < / tr > < / thead >
< tbody >
< tr > < td > 1< / td > < td > Structural Rib Topology< / td > < td style = "color:var(--accent);font-weight:700;" > CRITICAL (67– < / td > < / tr >
< tr > < td > 2< / td > < td > Center Thickness< / td > < td style = "color:var(--accent);font-weight:700;" > CRITICAL (+106% MFG)< / td > < / tr >
< tr > < td > 3< / td > < td > Pocket Radii< / td > < td style = "color:#fbbf24;font-weight:600;" > HIGH (requires re-optimization)< / td > < / tr >
< tr > < td > 4< / td > < td > Center Mini Ribs< / td > < td style = "color:var(--accent2);font-weight:600;" > POSITIVE (7– < / td > < / tr >
< tr > < td > 5< / td > < td > Support Cone Angle< / td > < td > Low-Moderate< / td > < / tr >
< tr > < td > 6< / td > < td > RDOF Stiffness< / td > < td > Negligible (< 0.2%)< / td > < / tr >
< / tbody >
< / table >
< br >
< div class = "warn-box" >
< p style = "font-size:0.65em;" > ⚠️ The ribs provide stiffness against asymmetric gravity deflection. Removing them increases high-order aberrations (J4+) by 2.4× < / p >
< / div >
< / div >
< / section >
<!-- ===== SELECTED DESIGN ===== -->
< section >
< h2 > Selected Design — Option B (Conical V14)< / h2 >
< div class = "metric-row" >
< div class = "metric-card green" > < div class = "value" > 7.70 nm< / div > < div class = "label" > WFE 40° (65% margin)< / div > < / div >
< div class = "metric-card green" > < div class = "value" > 17.69 nm< / div > < div class = "label" > WFE 60° (20% margin)< / div > < / div >
< div class = "metric-card" > < div class = "value" > 37.06 nm< / div > < div class = "label" > MFG 90° (acceptable)< / div > < / div >
< / div >
< div class = "metric-row" >
< div class = "metric-card green" > < div class = "value" > 95.81 kg< / div > < div class = "label" > Mass (7.4% margin)< / div > < / div >
< div class = "metric-card blue" > < div class = "value" > $525K< / div > < div class = "label" > Schott Quote (+0.4%)< / div > < / div >
< div class = "metric-card" > < div class = "value" > 22 nm< / div > < div class = "label" > Requirement (λ/25)< / div > < / div >
< / div >
< br >
< table >
< thead > < tr > < th > Factor< / th > < th > Option B (Selected)< / th > < th > Option C (Trade Study)< / th > < / tr > < / thead >
< tbody >
< tr > < td > < b > WFE 40°< / b > < / td > < td > 7.70 nm< / td > < td > 8.09 nm< / td > < / tr >
< tr > < td > < b > WFE 60°< / b > < / td > < td > 17.69 nm< / td > < td > 18.81 nm< / td > < / tr >
< tr > < td > < b > Mass< / b > < / td > < td style = "color:var(--accent2);" > 95.81 kg ✓< / td > < td > 102.38 kg< / td > < / tr >
< tr > < td > < b > Quote< / b > < / td > < td > $525,000< / td > < td > $520,000< / td > < / tr >
< tr > < td > < b > Risk< / b > < / td > < td style = "color:var(--accent2);" > Lower (proven geometry)< / td > < td > Moderate (new variant)< / td > < / tr >
< / tbody >
< / table >
< / section >
<!-- ===== RECENT DEV: CONTACT MODEL ===== -->
< section >
< h2 > Recent Development — Refined Lateral Contact Model< / h2 >
< div class = "highlight-box" >
< p style = "font-size:0.7em;" > < b > Design decision (Jan 30, 2026):< / b > Changed lateral shoe-blank interface from silicone adhesive to low-friction sliding material (Teflon-like).< / p >
< / div >
< br >
< div class = "two-col" >
< div style = "text-align:left;" >
< h3 > Why this change?< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > < b > Mirror independence< / b > — blank floats freely within lateral supports< / li >
< li class = "fragment fade-up" > < b > No parasitic transfer< / b > — frame distortions decoupled from mirror< / li >
< li class = "fragment fade-up" > < b > Conservative< / b > — worst-case for self-support; actual friction → < i > better< / i > performance< / li >
< / ul >
< / div >
< div >
< table >
< thead > < tr > < th > Metric< / th > < th > Previous< / th > < th > Refined< / th > < th > Δ< / th > < / tr > < / thead >
< tbody >
< tr > < td > < b > WFE 40°< / b > < / td > < td > 6.12 nm< / td > < td > 7.70 nm< / td > < td > +26%< / td > < / tr >
< tr > < td > < b > WFE 60°< / b > < / td > < td > 13.41 nm< / td > < td > 17.69 nm< / td > < td > +32%< / td > < / tr >
< tr > < td > < b > MFG 90°< / b > < / td > < td > 27.01 nm< / td > < td > 37.06 nm< / td > < td > +37%< / td > < / tr >
< / tbody >
< / table >
< / div >
< / div >
< br >
< div class = "success-box" >
< p style = "font-size:0.65em;" > ✅ All values remain compliant with 22 nm requirement. Higher values = more physically accurate, not design degradation.< / p >
< / div >
< / section >
<!-- ===== WFE FIGURES ===== -->
< section >
< h2 > Optical Performance — WFE Surface Maps< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/plots/html2.png" class = "small-img" alt = "WFE 40 vs 20" >
< div class = "caption" > WFE surface — 40° vs 20° (7.70 nm RMS)< / div >
< / div >
< div >
< img src = "./assets/plots/html3.png" class = "small-img" alt = "WFE 60 vs 20" >
< div class = "caption" > WFE surface — 60° vs 20° (17.69 nm RMS)< / div >
< / div >
< / div >
< br >
< p style = "font-size:0.6em; color:rgba(232,238,247,0.5);" > Refined contact model (Jan 30, 2026). J1– < / p >
< / section >
<!-- ===== MFG + BAR CHART ===== -->
< section >
< h2 > Manufacturing & Analysis Summary< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/plots/html4.png" class = "small-img" alt = "MFG 90" >
< div class = "caption" > Manufacturing residual at 90° — 37.06 nm RMS< / div >
< / div >
< div >
< img src = "./assets/plots/html1.png" class = "small-img" alt = "Summary bar chart" >
< div class = "caption" > Per-angle RMS WFE bar chart (Atomizer report)< / div >
< / div >
< / div >
< / section >
<!-- ===== ZERNIKE & PSD ===== -->
< section >
< h2 > Zernike Trajectory & PSD Analysis< / h2 >
< div class = "two-col" >
< div >
< img src = "./assets/plots/html5.png" class = "small-img" alt = "Zernike trajectory" >
< div class = "caption" > Zernike mode RMS vs. elevation — Spherical (Z11) dominates. Linear R² = 1.0000< / div >
< / div >
< div >
< img src = "./assets/plots/html7.png" class = "small-img" alt = "Surface PSD" >
< div class = "caption" > Surface PSD — gravity signature, support print-through, high-frequency bands< / div >
< / div >
< / div >
< br >
< p style = "font-size:0.6em; color:rgba(232,238,247,0.5);" > PSD analysis confirms support print-through dominates (71– < / p >
< / section >
<!-- ===== ZERNIKE COEFFICIENTS ===== -->
< section >
< h2 > Zernike Coefficient Breakdown< / h2 >
< div class = "three-col" >
< div >
< img src = "./assets/plots/html10.png" class = "thumb" alt = "Zernike 40" >
< div class = "caption" > 40° vs 20° — Defocus (J04) dominant< / div >
< / div >
< div >
< img src = "./assets/plots/html11.png" class = "thumb" alt = "Zernike 60" >
< div class = "caption" > 60° vs 20° — Secondary Astigmatism (J13) rises< / div >
< / div >
< div >
< img src = "./assets/plots/html12.png" class = "thumb" alt = "Zernike 90" >
< div class = "caption" > 90° absolute — Spherical (J11) at 37.5 nm< / div >
< / div >
< / div >
< / section >
2026-01-29 03:08:05 +00:00
2026-01-30 15:29:34 +00:00
<!-- ===== MODAL ANALYSIS ===== -->
< section >
< h2 > Modal Analysis — Natural Frequencies< / h2 >
< div class = "highlight-box" >
< p style = "font-size:0.7em;" > < b > First mode: 250.4 Hz< / b > — exceeds 150 Hz requirement by 67% margin.< / p >
< / div >
< br >
< div class = "two-col" >
< div >
< table >
< thead > < tr > < th > Mode< / th > < th > Freq (Hz)< / th > < th > Description< / th > < / tr > < / thead >
< tbody >
< tr > < td > 1< / td > < td > < b > 250.4< / b > < / td > < td > Trefoil bending (3-nodal dia.)< / td > < / tr >
< tr > < td > 2< / td > < td > 259.3< / td > < td > Astigmatic bending (2-nodal dia.)< / td > < / tr >
< tr > < td > 3< / td > < td > 466.2< / td > < td > Rocking/tilting< / td > < / tr >
< tr > < td > 4< / td > < td > 668.8< / td > < td > Higher-order bending< / td > < / tr >
< / tbody >
< / table >
< / div >
< div >
< img src = "./assets/plots/Mode1.png" class = "small-img" alt = "Mode 1 shape" >
< div class = "caption" > Mode 1 (250.4 Hz) — trefoil bending, 3-nodal diameter pattern< / div >
< / div >
< / div >
< br >
< p style = "font-size:0.6em; color:rgba(232,238,247,0.5);" > SOL 103 analysis with fixed BCs at all 54 whiffletree + 3 lateral support points. All 10 modes well above 150 Hz.< / p >
< / section >
<!-- ===== BOUNDARY CONDITION STRATEGY ===== -->
< section >
< h2 > Boundary Condition Strategy< / h2 >
< div style = "text-align:left; max-width:680px; margin:0 auto;" >
< h3 > The Decoupling Approach< / h3 >
< p style = "font-size:0.68em;" > We deliberately decouple two problems that can be solved independently:< / p >
< div class = "highlight-box" >
< p style = "font-size:0.68em;" > < b > Step 1:< / b > Optimize blank for ideal fixed BCs → < span class = "tag tag-done" > Complete (CDR)< / span > < / p >
< p style = "font-size:0.68em;" > < b > Step 2:< / b > Engineer reference frame to approach ideal BCs → < span class = "tag tag-open" > In progress (FDR)< / span > < / p >
< / div >
< br >
< h3 > Why this works< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > Reduces complexity: 14 variables vs. 60+ (blank + frame coupled)< / li >
< li class = "fragment fade-up" > Blank procurement & frame design proceed < b > in parallel< / b > < / li >
< li class = "fragment fade-up" > Clear success criteria: frame stiffness targets derived from WFE sensitivity< / li >
< li class = "fragment fade-up" > Standard practice in large telescope projects (TMT, GMT, E-ELT)< / li >
< / ul >
< br >
< h3 > The self-maintaining structure< / h3 >
< p style = "font-size:0.65em;" > The optimized blank is a < b > self-maintaining structure< / b > — ribs aligned with gravity load paths, mass placed where stiffness is needed. Even with moderate support compliance, inherent structural efficiency limits WFE growth.< / p >
< / div >
< / section >
<!-- ===== REFERENCE FRAME SCOPE ===== -->
< section >
< h2 > Reference Frame — Scope & Requirements< / h2 >
< div class = "two-col" >
< div style = "text-align:left;" >
< h3 > Scope Boundary< / h3 >
< table >
< tr > < th > Deliverable< / th > < th > Owner< / th > < th > Status< / th > < / tr >
< tr > < td > M1 Blank (Zerodur)< / td > < td > Optiques Fullum< / td > < td > < span class = "tag tag-done" > CDR ✓< / span > < / td > < / tr >
< tr > < td > Vertical Support (54-pt)< / td > < td > Optiques Fullum< / td > < td > < span class = "tag tag-done" > CDR ✓< / span > < / td > < / tr >
< tr > < td > Lateral Support (3-pt)< / td > < td > Optiques Fullum< / td > < td > < span class = "tag tag-done" > CDR ✓< / span > < / td > < / tr >
< tr > < td > Reference Frame< / td > < td > StarSpec< / td > < td > < span class = "tag tag-new" > Concept proposed< / span > < / td > < / tr >
< / table >
< br >
< h3 > Frame Stiffness Targets< / h3 >
< table >
< tr > < th > Parameter< / th > < th > Requirement< / th > < / tr >
< tr > < td > Support point deflection< / td > < td > < 1 μm< / td > < / tr >
< tr > < td > First mode (frame + mirror)< / td > < td > > 150 Hz< / td > < / tr >
< tr > < td > Mass (frame only)< / td > < td > < 20 kg< / td > < / tr >
< / table >
< / div >
< div >
< img src = "./assets/components/Reference-Frame/side.png" class = "small-img" alt = "Reference frame side" >
< div class = "caption" > Reference frame — side view< / div >
< br >
< div class = "warn-box" >
< p style = "font-size:0.6em;" > ⚠️ < b > CDR Open Item:< / b > ΔWFE vs. stiffness sweep not yet executed. Method is defined; execution is highest-priority post-CDR task.< / p >
< / div >
< / div >
< / div >
< / section >
<!-- ===== WHY ORDER NOW ===== -->
< section >
< h2 > Why It's Safe to Order the Blank Now< / h2 >
< div style = "text-align:left; max-width:680px; margin:0 auto;" >
< h3 > Evidence of Convergence< / h3 >
< table >
< tr > < th > Campaign< / th > < th > Improvement< / th > < th > Trials After Plateau< / th > < / tr >
< tr > < td > Flat Back V9 → V10< / td > < td > +1.3% (worse)< / td > < td > 296< / td > < / tr >
< tr > < td > Adaptive V13 → V14< / td > < td > − < / td > < td > 785< / td > < / tr >
< tr > < td > Adaptive V14 → V15< / td > < td > 0% (none)< / td > < td > 126< / td > < / tr >
< / table >
< br >
< h3 > The Frame is a Solvable Problem< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > Known physics — CFRP structural engineering, not research< / li >
< li class = "fragment fade-up" > Conservative stiffness target (< 1 μm) with margin< / li >
< li class = "fragment fade-up" > Mitigation options exist if needed (local stiffening, shimming)< / li >
< li class = "fragment fade-up" > Frame development is < b > independent< / b > of blank design< / li >
< / ul >
< br >
< div class = "highlight-box" >
< p style = "font-size:0.7em;" > 🕐 < b > Schedule driver:< / b > 18-week Schott lead time. Quote valid until < b > March 4, 2026< / b > . Delaying for coupled optimization would extend program by months with uncertain benefit.< / p >
< / div >
< / div >
< / section >
<!-- ===== RISK ASSESSMENT ===== -->
< section >
< h2 > Risk Assessment< / h2 >
< div class = "two-col" >
< div >
< table >
< thead > < tr > < th > Risk< / th > < th > L< / th > < th > I< / th > < th > Status< / th > < / tr > < / thead >
< tbody >
< tr > < td > Design convergence< / td > < td > 1< / td > < td > 3< / td > < td > < span class = "tag tag-done" > Closed< / span > < / td > < / tr >
< tr > < td > Cost exceeds budget< / td > < td > 2< / td > < td > 2< / td > < td > < span class = "tag tag-done" > Reduced< / span > < / td > < / tr >
< tr > < td > Schott delivery delay< / td > < td > 2< / td > < td > 3< / td > < td > < span class = "tag tag-open" > Open< / span > < / td > < / tr >
< tr > < td > Frame stiffness< / td > < td > 2< / td > < td > 2< / td > < td > < span class = "tag tag-new" > New< / span > < / td > < / tr >
< tr > < td > Mass exceedance< / td > < td > 1< / td > < td > 2< / td > < td > < span class = "tag tag-done" > Closed< / span > < / td > < / tr >
< tr > < td > Polishing difficulty< / td > < td > 1< / td > < td > 3< / td > < td > < span class = "tag tag-done" > Reduced< / span > < / td > < / tr >
< tr > < td > Interface incompatibility< / td > < td > 2< / td > < td > 2< / td > < td > < span class = "tag tag-open" > Open< / span > < / td > < / tr >
< / tbody >
< / table >
< / div >
< div style = "text-align:left;" >
< h3 > Trend Since PDR< / h3 >
< table >
< tr > < th > Category< / th > < th > PDR< / th > < th > CDR< / th > < th > < / th > < / tr >
< tr > < td > Technical< / td > < td > Medium< / td > < td style = "color:var(--accent2);" > Low-Med< / td > < td > ↓< / td > < / tr >
< tr > < td > Schedule< / td > < td > Medium< / td > < td > Medium< / td > < td > →< / td > < / tr >
< tr > < td > Cost< / td > < td > High< / td > < td style = "color:var(--accent2);" > Medium< / td > < td > ↓< / td > < / tr >
< tr > < td > Integration< / td > < td > Medium< / td > < td > Medium< / td > < td > →< / td > < / tr >
< / table >
< br >
< div class = "success-box" >
< p style = "font-size:0.6em;" > Technical and cost risks significantly improved since PDR. Risk posture supports procurement.< / p >
< / div >
< / div >
< / div >
< / section >
<!-- ===== WHAT'S DONE / WHAT'S NEXT ===== -->
< section >
< h2 > What's Done & What's Next< / h2 >
< div class = "two-col" >
< div style = "text-align:left;" >
< h3 style = "color:var(--accent2);" > ✅ Completed at CDR< / h3 >
< ul style = "font-size:0.65em;" >
< li > Mirror blank geometry — optimized & validated< / li >
< li > Support positions — optimized (14 variables)< / li >
< li > Cost reduction campaign — closed $102K gap< / li >
< li > Design selection — Option B confirmed< / li >
< li > Whiffletree architecture — defined< / li >
< li > Lateral support architecture — defined< / li >
< li > Refined contact model — conservative basis< / li >
< li > Schott quote received — $525K< / li >
< / ul >
< / div >
< div style = "text-align:left;" >
< h3 style = "color:var(--accent3);" > 🔜 Post-CDR Priorities< / h3 >
< ul style = "font-size:0.65em;" >
< li > < b > Frame stiffness characterization< / b > (ΔWFE vs. K sweep)< / li >
< li > Reference frame preliminary design< / li >
< li > Whiffletree detailed design< / li >
< li > Lateral support detailed design< / li >
< li > ICD finalization with StarSpec< / li >
< li > Modal analysis (frame + mirror)< / li >
< li > STOP analysis (StarSpec scope)< / li >
< / ul >
< / div >
< / div >
< / section >
<!-- ===== TIMELINE ===== -->
< section >
< h2 > Path to FDR — Timeline< / h2 >
< div class = "timeline" >
< div class = "timeline-item done" >
< div class = "date" > January 2026< / div >
< div class = "desc" > < b > CDR Approval< / b > & Design Selection< / div >
< / div >
< div class = "timeline-item done" >
< div class = "date" > February 2026< / div >
< div class = "desc" > < b > Blank Order< / b > — Schott PO placement< / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > February 2026< / div >
< div class = "desc" > < b > Frame stiffness characterization< / b > — Highest priority post-CDR< / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > Feb– < / div >
< div class = "desc" > < b > Reference frame preliminary design< / b > + ICD coordination< / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > April– < / div >
< div class = "desc" > < b > Support hardware detailed design< / b > < / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > June 2026< / div >
< div class = "desc" > < b > Blank delivery< / b > from Schott (~18 weeks)< / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > June– < / div >
< div class = "desc" > < b > Polishing< / b > at Optiques Fullum< / div >
< / div >
< div class = "timeline-item" >
< div class = "date" > Q4 2026< / div >
< div class = "desc" > < b > FDR< / b > — Final Design Review< / div >
< / div >
< / div >
< / section >
<!-- ===== REQUIREMENT COMPLIANCE ===== -->
< section >
< h2 > Requirement Compliance Summary< / h2 >
< table >
< thead > < tr > < th > Category< / th > < th > Metric< / th > < th > Achieved< / th > < th > Requirement< / th > < th > Margin< / th > < th > Status< / th > < / tr > < / thead >
< tbody >
< tr > < td > Optical< / td > < td > WFE 40°< / td > < td > 7.70 nm< / td > < td > 22 nm< / td > < td > 65%< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Optical< / td > < td > WFE 60°< / td > < td > 17.69 nm< / td > < td > 22 nm< / td > < td > 20%< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Optical< / td > < td > MFG 90°< / td > < td > 37.06 nm< / td > < td > —< / td > < td > Acceptable< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Mechanical< / td > < td > Mass< / td > < td > 95.81 kg< / td > < td > 103.5 kg< / td > < td > +7.4%< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Mechanical< / td > < td > Clear Aperture< / td > < td > 1202 mm< / td > < td > 1200 mm< / td > < td > —< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Cost< / td > < td > Blank Quote< / td > < td > $525K< / td > < td > $523K< / td > < td > +0.4%< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< tr > < td > Dynamic< / td > < td > Mode 1< / td > < td > 250.4 Hz< / td > < td > > 150 Hz< / td > < td > 67%< / td > < td style = "color:var(--accent2);" > ✓< / td > < / tr >
< / tbody >
< / table >
< br >
< div class = "success-box" >
< p style = "font-size:0.7em;" > All requirements met with margin. Design is mature and validated.< / p >
< / div >
< / section >
<!-- ===== RECOMMENDATION ===== -->
< section data-background-gradient = "linear-gradient(135deg, #0b0f14 0%, #111827 50%, #0b0f14 100%)" >
< h2 style = "color:white;" > Recommendation< / h2 >
< div style = "background:rgba(255,255,255,0.05); border:1px solid rgba(232,238,247,0.12); border-radius:12px; padding:30px; max-width:650px; margin:0 auto;" >
< p style = "font-size:1.0em; color:white; font-weight:700;" > Approve CDR & proceed with blank procurement< / p >
< hr style = "border:none; height:1px; background:rgba(232,238,247,0.15); margin:16px 0;" >
< div style = "text-align:left;" >
< ul style = "font-size:0.68em; color:rgba(255,255,255,0.9); line-height:1.8;" >
< li > < b > Design maturity:< / b > 3,770+ FEA simulations, confirmed convergence< / li >
< li > < b > Performance:< / b > WFE 20– < / li >
< li > < b > Mass:< / b > 7.4% under allocation< / li >
< li > < b > Cost:< / b > Within 0.4% of budget ($525K)< / li >
< li > < b > Schedule critical:< / b > 18-week lead time — quote valid until March 4< / li >
< / ul >
< / div >
< hr style = "border:none; height:1px; background:rgba(232,238,247,0.15); margin:16px 0;" >
< p style = "font-size:0.75em; color:var(--accent3);" > Next investment: Reference frame characterization + detailed support design → FDR Q4 2026< / p >
< / div >
< / section >
<!-- ===== INVESTMENT CASE ===== -->
< section >
< h2 > The Investment Case — Continuing to FDR< / h2 >
< div style = "text-align:left; max-width:680px; margin:0 auto;" >
< h3 > What the next phase delivers< / h3 >
< div class = "three-col" style = "margin-top:12px;" >
< div class = "metric-card" style = "text-align:left; padding:12px;" >
< p style = "font-size:0.6em; font-weight:700; color:var(--accent3);" > Frame Characterization< / p >
< p style = "font-size:0.55em;" > ΔWFE vs. stiffness curve — converts "reference frame risk" into a quantified, verifiable engineering requirement< / p >
< / div >
< div class = "metric-card" style = "text-align:left; padding:12px;" >
< p style = "font-size:0.6em; font-weight:700; color:var(--accent3);" > Detailed Hardware Design< / p >
< p style = "font-size:0.55em;" > Whiffletree + lateral supports ready for fabrication. ICD locked with StarSpec.< / p >
< / div >
< div class = "metric-card" style = "text-align:left; padding:12px;" >
< p style = "font-size:0.6em; font-weight:700; color:var(--accent3);" > Polished Mirror< / p >
< p style = "font-size:0.55em;" > Finished M1 primary mirror, verified against optical specs. Ready for integration.< / p >
< / div >
< / div >
< br >
< h3 > Why continue now< / h3 >
< ul style = "font-size:0.65em;" >
< li class = "fragment fade-up" > 3,770+ simulations have < b > retired the major technical risk< / b > — blank design is settled< / li >
< li class = "fragment fade-up" > The path from CDR → FDR is < b > known engineering< / b > , not research< / li >
< li class = "fragment fade-up" > Schott quote expires March 4 — delay means re-quoting at likely higher cost< / li >
< li class = "fragment fade-up" > Parallel development maximizes schedule efficiency< / li >
< / ul >
< br >
< div class = "highlight-box" >
< p style = "font-size:0.68em;" > < b > Bottom line:< / b > The hard part is done. Proceeding now converts 4 months of computational investment into a validated, flight-ready mirror assembly.< / p >
< / div >
< / div >
< / section >
<!-- ===== CLOSING ===== -->
< section data-background-gradient = "linear-gradient(135deg, #0b0f14 0%, #111827 50%, #0b0f14 100%)" >
< h1 style = "color:white;" > Thank You< / h1 >
< p style = "color:rgba(232,238,247,0.6); font-size:0.75em;" > Questions & Discussion< / p >
< br >
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2026-01-29 03:08:05 +00:00
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