{"artifact_id":"L1-152","layer":"L1","title":"XFEL Serial Femtosecond Crystallography (SFX)","domain":"Ultrafast Imaging","sub_domain":"Single-pulse diffraction from microcrystals at XFEL","physics_fingerprint":{"L_DAG":4.5,"title":"XFEL Serial Femtosecond Crystallography (SFX)","domain":"Ultrafast Imaging","carrier":"x_ray","primitives":["L.xfel_pulse","L.microcrystal_diffraction","L.bragg_indexing","int.spatial"],"sub_domain":"Single-pulse diffraction from microcrystals at XFEL","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"3D_electron_density","difficulty_delta":10,"integration_axis":"angular","sensing_mechanism":"xfel_serial_crystallography"},"observable_profile":{"metric":"PSNR_dB","regime":"Existence of the recovered 3D electron density is guaranteed within the declared Omega bounds. Uniqueness is local rather than global (non-convex landscape); convergence depends on initialisation and priors. Stability is moderately conditioned (kappa_eff ~= 32); hit_rate dominates the stability cliff; detector_dynamic_range and the remaining mismatch parameters contribute higher-order bias terms. Photon-shot-noise-limited (poisson counting) sets the irreducible data-fidelity floor, while TV / wavelet-sparsity / deep priors stabilise recovery at the ill-conditioned end of Omega.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"H":2048,"W":2048,"hit_rate":0.1,"pulse_fs":10,"N_patterns":100000,"partial_reflection":0.3,"beam_pointing_jitter":0.0,"detector_dynamic_range":1000},"input_format":"measurement_only","problem_class":"xfel_sfx","forward_operator":"xfel_sfx_forward","epsilon_fn_center":"18.0"},"omega_bounds":{"H":512,"W":512,"hit_rate":[0.001,0.5],"pulse_fs":[1,100],"N_patterns":[1000,10000000],"partial_reflection":[0.0,0.8],"beam_pointing_jitter":[0.0,0.5],"detector_dynamic_range":[100,100000]},"epsilon_bounds":{"psnr_db":[5.0,40.0]},"allowed_problem_classes":["xfel_sfx"],"allowed_omega_dimensions":["N_patterns","H","W","pulse_fs","hit_rate","detector_dynamic_range","partial_reflection","beam_pointing_jitter","hit_rate","detector_dynamic_range","partial_reflection","beam_pointing_jitter"],"allowed_forward_operators":["xfel_sfx_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":10,"kappa":640,"metric":"PSNR_dB"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xad88d8cac208f04b05bb35046a26df5e8bce02750b42484545e642dba6bfa07c","chain_tx_hash":"0x850345eebf6101146e85cc99b69c3d272c1428c2f46254dbac14992d8d64950f","chain_block":41554229}