arXiv AI

Inverse Modeling for Laser Pulse Shape Design in Inertial Confinement Fusion

The paper introduces the ICF Laser Pulse Shape Design System (LPDS), a generative inverse modeling framework that directly maps desired fusion outcomes and pellet configurations to optimized laser pulse shapes. It incorporates a multi-objective loss function to enforce physical constraints and experimental requirements, and offers tools such as constraint-conditioning, inpainting, and gradient-based editing for fine-grained pulse control. The authors also demonstrate the framework’s applicability to a limited set of real experimental shots, positioning LPDS as a data-driven approach to advance practical inertial confinement fusion.

arXiv AI
Jul 14

Co4ICF: Co-evolving Physics-Informed Surrogate and RL-based Pulse Optimizer for Inertial Confinement Fusion

arXiv:2607. 10366v1 Announce Type: new Abstract: Offline-trained surrogates for Inertial Confinement Fusion (ICF) suffer a well-known failure mode that iterative optimizers drive inputs into out-of-distribution (OOD) regions where predictions become unreliable.

By Jiatong Zhao, Tengyue Zhang, Yuhan Wang, Fuyuan Wu, Junchi Yan
arXiv Machine Learning
Oct 12

Reinforcement learning for inverse silhouette design and rapid laser cutting of compact parallelogram quad kirigami prototypes

The paper introduces RL‑Kirigami, an inverse design framework that uses optimal‑transport conditional flow matching (OT‑CFM) and reinforcement learning to generate compatible ratio fields for compact reconfigurable parallelogram quad kirigami. A marching decoder enforces global geometric compatibility, while Group Relative Policy Optimization (GRPO) aligns the generator with nondifferentiable rewards for silhouette matching, feasibility, and ratio‑field regularity. The method achieves high silhouette IoU scores (up to 94.91%) and reduces forward simulator evaluations from hundreds to one, enabling rapid laser‑cut prototypes in polymeric sheets within about eight minutes.

By Milad Yazdani, Shahriar Shalileh, Dena Shahriari
arXiv Machine Learning
Oct 2

PMosFM: Preconditioned Manifold Matching for One-Step Physics-Constrained Generation

PMosFM introduces a preconditioned manifold matching framework that enables one‑step physics‑constrained generation by encoding constraints in a manifold decoder. The method learns transport in intrinsic coordinates, eliminating the need for residual losses or trajectory unrolling, and employs a geometric preconditioner and covariance transform to improve conditioning. Experiments demonstrate reduced training and sampling time compared to multi‑step baselines while maintaining comparable physical and distributional fidelity.

By Zhangyong Liang, Haibin Ling
arXiv Machine Learning
Oct 9

Bayesian Optimisation under State-Preservation Constraints

The paper introduces a method for Bayesian optimisation in engineering design problems where both the objective and constraints depend on the state of a PDE solution. It proposes pre‑computing a set of controls whose linearised constraint response remains within tolerance, effectively pulling the state‑space constraint into design space and forming an ellipsoid from which well‑spread candidates can be drawn. The linear response map is refined online, and the approach is demonstrated on Tokamak divertor optimisation with plasma‑boundary preservation.

By Gabriel Diaz-Aylwin, Vignesh Gopakumar, Omkar Myatra, David Moulton, Lorenzo Zanisi, David S. Leslie, Henry B. Moss