{"artifact_id":"L1-254","layer":"L1","title":"X-ray Phase Contrast — propagation / grating / analyzer","domain":"Electromagnetics","sub_domain":"X-ray phase and attenuation imaging","physics_fingerprint":{"L_DAG":3.3,"title":"X-ray Phase Contrast — propagation / grating / analyzer","domain":"Electromagnetics","carrier":"em","primitives":["L.xray_source","L.refract_sample","L.propagate","int.spatial"],"sub_domain":"X-ray phase and attenuation imaging","noise_model":"shot_poisson","problem_class":"linear_inverse","solution_space":"3D_refractive_index_delta_beta","difficulty_delta":5,"integration_axis":"spatial","sensing_mechanism":"xray_ccd"},"observable_profile":{"metric":"PSNR_dB","regime":"Conditional stability; mismatch parameters dominate at Omega bounds.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":2048,"W":2048,"Z":128,"SNR_dB":30,"z_error":0.0,"N_distances":3,"coherence_error":0.0,"beam_harmonics_error":0.0},"input_format":"measurement_only","problem_class":"xray_pc","forward_operator":"xray_pc_forward","epsilon_fn_center":"25.0"},"omega_bounds":{"H":[256,8192],"W":[256,8192],"Z":[32,1024],"SNR_dB":[0,40],"z_error":[0.0,0.1],"N_distances":[1,50],"coherence_error":[0.0,0.3],"beam_harmonics_error":[0.0,0.2]},"epsilon_bounds":{"psnr_db":[10.0,45.0]},"allowed_problem_classes":["xray_pc"],"allowed_omega_dimensions":["H","W","Z","N_distances","SNR_dB","z_error","coherence_error","beam_harmonics_error","z_error","coherence_error","beam_harmonics_error"],"allowed_forward_operators":["xray_pc_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":400,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xf3df13574937e5b2987af88ac19d4520895b2819e64c29616282a70955a7fde8","chain_tx_hash":"0x630fccc1c8e7fdbbe95916e6199752865d47f2449ed24e02ac4bde7fd134dab0","chain_block":41554001}