{"artifact_id":"L1-126","layer":"L1","title":"SAXS — Small-Angle X-ray Scattering","domain":"Scientific Instrumentation","sub_domain":"Nanoscale structural scattering (1-100 nm)","physics_fingerprint":{"L_DAG":2.7,"title":"SAXS — Small-Angle X-ray Scattering","domain":"Scientific Instrumentation","carrier":"photon","primitives":["L.scatter.elastic","L.project.q","int.angular"],"sub_domain":"Nanoscale structural scattering (1-100 nm)","noise_model":"shot_poisson","problem_class":"inverse_fourier_scatter","solution_space":"pair_distribution_or_envelope","difficulty_delta":3,"integration_axis":"angular","sensing_mechanism":"xray_small_angle_scatter"},"observable_profile":{"metric":"Rg_RMSE_nm","regime":"Inverse Fourier transform from I(q) to P(r) is ill-posed (ATSAS-GNOM uses regularization); shape reconstruction requires ab-initio bead models. Mismatch: aggregation, polydispersity, buffer mismatch.","secondary":"chi2_reduced"},"size_tiers":{"center_spec":{"omega":{"N_q":400,"Rg_nm":2.0,"q_max":0.5,"q_min":0.01,"concentration_mg_ml":1.0,"aggregation_fraction":0.0},"input_format":"scattering_curve_plus_buffer","problem_class":"biosaxs_globular_protein","forward_operator":"saxs_iq_forward","epsilon_fn_center":"0.05 nm Rg RMSE"},"omega_bounds":{"N_q":[50,2000],"Rg_nm":[0.5,50],"q_max":[0.1,1.0],"q_min":[0.001,0.1],"beam_damage":[0.0,0.5],"polydispersity":[0.0,0.5],"buffer_mismatch":[0.0,0.3],"q_range_truncation":[0.0,0.5],"concentration_mg_ml":[0.1,20],"aggregation_fraction":[0.0,0.5]},"epsilon_bounds":{"rg_rmse_nm":[0.01,1.0]},"allowed_problem_classes":["biosaxs_globular_protein","biosaxs_imp_flexible","saxs_nanoparticle","waxs_fiber"],"allowed_omega_dimensions":["N_q","q_min","q_max","Rg_nm","concentration_mg_ml","aggregation_fraction","polydispersity","buffer_mismatch","beam_damage","q_range_truncation"],"allowed_forward_operators":["saxs_iq_forward","waxs_iq_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":500,"metric":"Rg_RMSE_nm"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x6ea68f7f1986db6a5ed685b31657281b924c5f5c3a38a47cae6b5e03d6b986ae","chain_tx_hash":"0x671a3fa51d16ae2af60593a60dbc756a1ec43d71c82ba0962cef38eb9f046716","chain_block":41554213}