{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"backpressure__chemistry_materials","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"backpressure__chemistry_materials__P1","proposal_index":1,"version":0,"title":"Characterization-slot backpressure for aging-sensitive materials samples","problem":"A synthesis robot or parallel experimental team can produce air-sensitive or metastable materials samples faster than a powder X-ray diffraction instrument can characterize them. Samples then wait in sealed transfer capsules while the instrument is occupied, unavailable, or processing longer scans. When waiting time approaches the material-specific stability window, oxidation, phase transformation, relaxation, or other aging can make the eventual diffraction pattern cease to represent the as-synthesized state.","actors":["Synthesis operators or automated synthesis scheduler","Powder X-ray diffraction instrument and its operator","Inert-transfer or sample-preparation station","Principal investigator or laboratory manager responsible for experimental priorities","Aging-sensitive synthesized samples"],"observable_state":"For every pending sample, the laboratory can observe synthesis completion time, declared stability deadline, preparation status, X-ray diffraction queue position, estimated scan duration, instrument readiness, calibration holds, and the number and age distribution of synthesized-but-unscanned samples. Pressure exists when projected scan completion approaches a sample's stability deadline or the bounded inert queue approaches its limit.","consequence":"Continued synthesis under downstream congestion creates an aging backlog: characterization may describe altered rather than as-synthesized material, repeats consume reagents and instrument time, and comparisons among nominally equivalent samples become confounded by unequal delays.","affected_objective":"Preserve the temporal validity and traceability of structure characterization while keeping synthesized-but-unscanned inventory bounded and maintaining access for explicitly critical samples.","intervention":"Make X-ray diffraction capacity govern admission of new aging-sensitive syntheses. The instrument scheduler issues time-bounded characterization tokens derived from current readiness, committed scans, preparation capacity, and estimated scan durations. A synthesis may start only when it holds a token whose projected scan time falls inside that material's declared stability window. Rising pressure reduces parallel synthesis starts and pauses noncritical admissions; a hard work-in-progress bound prevents additional samples from entering the inert queue. Critical quality-control or safety-related samples use a separately reserved class. Admission resumes gradually only after queue age and projected completion fall below a lower recovery threshold, providing hysteresis. Once a chemical run has begun, this gate does not alter or interrupt it; it governs only admission of subsequent runs.","structural_mapping":[{"archetype_element":"Upstream producer","domain_realization":"The synthesis robot or experimental team initiating new material preparations."},{"archetype_element":"Downstream capacity-constrained receiver","domain_realization":"The X-ray diffraction workflow, including preparation, instrument availability, and scan duration."},{"archetype_element":"Flowing work item","domain_realization":"A newly synthesized, aging-sensitive sample requiring timely structural characterization."},{"archetype_element":"Observable downstream pressure","domain_realization":"Projected time-to-scan, queue age distribution, instrument status, preparation backlog, and remaining stability-window margin."},{"archetype_element":"Upstream signaling path","domain_realization":"Time-bounded characterization tokens and pause/resume states published by the instrument scheduler to the synthesis scheduler."},{"archetype_element":"Controllable admission point","domain_realization":"Authorization to start the next synthesis, before reagents are combined or a reaction is initiated."},{"archetype_element":"Bounded accumulation","domain_realization":"A fixed maximum number of synthesized-but-unscanned samples, with every admitted sample assigned a disposition and traceable reservation."},{"archetype_element":"Critical-flow invariant","domain_realization":"Reserved characterization capacity for predesignated quality-control or safety-related samples while exploratory samples are deferred."},{"archetype_element":"Recoverability","domain_realization":"Hysteretic, gradual restoration of synthesis admissions as the characterization queue drains."}],"mechanism_mapping":[{"mechanism_slug":"reactive_streams_demand_signaling","role":"The downstream characterization workflow explicitly requests only the number and timing of new samples it can accept within their stability windows; upstream synthesis responds to that demand rather than producing continuously.","counterfactual_removal":"Without demand tokens, synthesis remains insulated from current instrument capacity, so a dashboard may show congestion while new samples continue to enter the queue."},{"mechanism_slug":"bounded_producer_consumer_queues","role":"A hard limit on synthesized-but-unscanned samples blocks new admissions before aging inventory grows without bound.","counterfactual_removal":"Without the bound, sealed capsules become an expanding buffer that conceals overload and permits projected scan times to exceed sample stability windows."},{"mechanism_slug":"kanban_pull_systems_and_wip_limits","role":"A characterization slot functions as a pull authorization for one upstream synthesis, while priority classes and hysteresis govern scarce capacity and recovery.","counterfactual_removal":"Without pull authorization, the intervention collapses into advisory scheduling or a static production quota rather than downstream-capacity-driven control."}],"causal_chain":["Instrument downtime, long scans, or preparation congestion reduces current characterization capacity.","Projected scan completion times and sample-age margins reveal downstream pressure before samples exceed their declared stability windows.","The characterization scheduler reduces or withholds time-bounded tokens and communicates that state upstream.","The synthesis scheduler defers new noncritical runs before reagents are combined, while already-started reactions continue under their approved procedures.","Fewer new samples enter the inert-transfer queue, and the hard work-in-progress limit bounds accumulation.","The downstream workflow gains room to process admitted samples, with reserved capacity preserving designated critical characterization.","After projected completion times and queue age fall below the recovery threshold, tokens are restored gradually rather than in a burst."],"baseline":"Synthesis runs are launched from an upstream experiment plan or fixed daily quota, while X-ray diffraction is booked separately. Operators may notice backlog through calendars, capsule counts, or informal messages, but actual instrument pressure does not automatically constrain synthesis admission. Sealed storage absorbs the mismatch until delays become operationally apparent.","nearest_rivals":["Larger inert-storage capacity: holds more samples but does not make downstream capacity reduce upstream production and can conceal excessive aging delay.","Static daily synthesis quota: caps production independently of current instrument readiness, scan duration, and sample stability windows.","Faster or additional diffraction capacity: expands the receiver but does not regulate synthesis when capacity still varies or becomes unavailable.","Manual priority scheduling: can reorder scans after samples exist but need not prevent excess samples from being created.","Discarding or repeating overdue samples: sheds failed work after congestion has already consumed synthesis resources.","Fixed appointment booking: reserves nominal slots but lacks feedback from live preparation and instrument conditions unless reservations are dynamically withdrawn or issued."],"remaining_contrastive_claim":"The proposition to test is that live characterization capacity and remaining sample-stability margin can be converted into upstream synthesis-admission decisions early enough to bound aging inventory. The contrast with static quotas, storage, and ordinary booking is the closed causal loop: measured downstream pressure changes whether the next sample is created.","authority_safety":{"decision_authority":"The principal investigator or laboratory manager authorizes the pilot; the X-ray diffraction owner defines valid readiness signals and protected capacity; the synthesis operator retains authority over each chemical procedure and may reject an admission token.","authorized_first_step":"Run the proposed gate in advisory-only shadow mode on a bounded set of already-approved experiments; it may record hypothetical admit, defer, and priority decisions but may not start, stop, or modify a reaction.","excluded_actions":["Interrupting or changing an in-progress chemical reaction","Overriding instrument, ventilation, radiation, glovebox, or chemical-safety interlocks","Automatically assigning stability windows without approval from the responsible scientist","Deferring designated emergency, safety, or mandatory quality-control work without authorized review","Discarding samples, canceling booked scans, or changing experimental priorities automatically","Increasing reagent quantities, reaction concurrency, or instrument utilization beyond existing approvals"],"halt_rollback":"Halt the shadow or later pilot if readiness data are stale, token assignments conflict with approved priorities, protected work is delayed, or operators cannot reconcile scheduler state with physical samples. Disable the admission gate, return to the existing human scheduler, preserve all queue and token records for audit, and leave in-progress reactions and instrument safety controls untouched."},"negative_tests":{"strongest_counterevidence":"Timestamped samples show no reproducible association between synthesis-to-scan delay and phase, structure, repeat frequency, or data usability within the delays actually encountered, while the characterization queue also remains inside declared stability windows.","problem_falsifier":"The candidate problem is falsified for the selected workflow if no synthesized sample approaches an approved stability deadline under representative congestion, or if observed characterization discrepancies are explained by synthesis variability or measurement error rather than waiting time.","intervention_falsifier":"The intervention is falsified if accurately delivered pressure signals and admission decisions do not keep projected or actual queue age within the declared bound, or if equivalent queue control is obtained without downstream-driven admission while the token gate produces avoidable idle time or displaced backlog.","risks":["Signal lag or inaccurate scan-duration estimates admit too many samples before pressure is visible.","Conservative stability windows or stale instrument states cause over-throttling and unused synthesis capacity.","Admission can oscillate near a threshold unless pause and recovery thresholds are separated.","Low-priority exploratory work can starve if protected classes consume recurring capacity.","Priority labels can be inflated or gamed, producing priority inversion.","Reserved X-ray diffraction capacity can sit idle when an upstream synthesis fails or finishes late.","The visible X-ray diffraction queue can shrink while work accumulates invisibly at sample preparation or transfer.","Repeated deferral can shift congestion into precursor aging, staff scheduling, or other upstream constraints.","A local gate protecting one instrument can destabilize a broader workflow if samples require several downstream measurements with incompatible capacity signals."]},"next_evidence_step":"For one scheduled instrument shift and no more than twelve already-approved aging-sensitive syntheses, replay or observe actual timestamps in advisory-only shadow mode. Before the shift, the responsible scientists must declare each sample's stability deadline, scan estimate, and priority class. Record instrument-state updates, hypothetical tokens, predicted completion margins, actual queue ages, unused instrument intervals, and disagreements with operator decisions. The step supports further testing only if signals arrive before deadline breaches, every hypothetical admission has a traceable disposition, the modeled queue remains within its preset bound, and critical capacity is not displaced; any stale signal, missed protected sample, or hidden preparation backlog stops the exercise.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against prior proposals because runtime isolation prohibits inspecting them; this record contains only the single requested chemistry-and-materials realization.","revision_record":{"parent_version":null,"progress_targets_addressed":["Initial one-shot construction from the supplied archetype and domain card"],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}