Problem
q(axis) has ~30% error due to cylindrical approximation
Evidence
From validation notes:
- q(axis) error: ~30%
- Root cause: Cylindrical approximation in profile model
- Other q-values more accurate
Impact
- Core safety factor不准确
- May affect ballooning mode analysis
- Limits physics fidelity
Proposed Solution
-
Better profile model:
- Use toroidal correction
- Improve near-axis approximation
- Reference: Literature formulas
-
Alternative approaches:
- Higher-order expansion
- Direct integration along field lines
- Adaptive grid near axis
Priority
Low 🟢 - Known limitation, acceptable for current use
Benefits
- Improved physics accuracy
- Better comparison with experiments
- Enhanced credibility
Reported by: 小P ⚛️ + 小A 🤖
Date: 2026-03-23
Problem
q(axis) has ~30% error due to cylindrical approximation
Evidence
From validation notes:
Impact
Proposed Solution
Better profile model:
Alternative approaches:
Priority
Low 🟢 - Known limitation, acceptable for current use
Benefits
Reported by: 小P ⚛️ + 小A 🤖
Date: 2026-03-23