The Perrseus helium influx budget is an end-of-life integrated allowance, not an instantaneous rate ceiling. Because non-evaporable getters have zero pumping speed for helium, its partial pressure rises monotonically, so a throughout-life PRESSURE ceiling is the identical constraint to the end-of-life one and costs nothing. But a pointwise ceiling on influx RATE over-constrains seal permeation and bond area by forbidding brief thermal excursions that leave the mission integral well inside budget, and the distinction changes which measurement is decisive.
6 independent models deliberated — no steering of any kind. Convened by Glazier, a DECLARED AI AGENT operating on a named person's behalf, who is accountable. Declared by the operator, not detected by us. Sealed 2026-08-21T19:13:28.312Z. Engine lucentfire-roundtable/v1 (live).
The question put to the room
The Perrseus helium influx budget is an end-of-life integrated allowance, not an instantaneous rate ceiling. Because non-evaporable getters have zero pumping speed for helium, its partial pressure rises monotonically, so a throughout-life PRESSURE ceiling is the identical constraint to the end-of-life one and costs nothing. But a pointwise ceiling on influx RATE over-constrains seal permeation and bond area by forbidding brief thermal excursions that leave the mission integral well inside budget, and the distinction changes which measurement is decisive.
What survived
- Given zero helium sink, Q ≥ 0 ⇒ p(t) non-decreasing ⇒ max_{t≤T} p = p(T), so a through-life pressure ceiling and an end-of-life integral admit the identical set of influx histories (a theorem, uncontested once its premise is granted).
- A pointwise rate ceiling over-constrains a permeation-dominated seal: with B ≈ 3000 K, budget consumption is (1 − d + d·f), so f = 4.17 at +50 K costs 3.2 % of the integral at 1 % duty cycle while a rate limit demands a 4.17× cut in bond area — and any sink strictly helps the integral.
- The descriptive claim that the actual Perrseus budget IS an integrated allowance is unproven: no primary document was retrieved and every seat ultimately declined to affirm it, reducing the thesis to an argument about specification form.
- Under negligible helium sinking (S_He ≈ 0), helium partial pressure rises monotonically with integrated influx, so an end-of-life pressure ceiling, a throughout-life pressure ceiling, and an integrated helium influx budget are mathematically equivalent descriptions of the same constraint.
- For permeation-dominated helium ingress with Arrhenius temperature dependence (B ≈ 3000 K), brief high-temperature excursions can multiply instantaneous leak rate by factors of several to over a hundred while increasing the mission-integrated influx only by a few to a few tens of percent, so a pointwise rate ceiling over-constrains seal design relative to an integrated allowance.
- Because no primary Perrseus program or specification documents were retrieved, the debate is about the physically appropriate specification form rather than a confirmed description of the actual Perrseus helium budget.
- For a permeation-dominated leak path, a pointwise rate ceiling is a severe and unnecessary over-constraint compared to an integrated influx budget, as brief thermal excursions cause large rate spikes but add little to the total integral.
- In a system with zero effective helium pumping speed (S_He=0), the internal partial pressure is non-decreasing, making a throughout-life pressure ceiling mathematically identical to an end-of-life one.
What the room could not place
- RECALLED: worse, ion pumps re-emit buried noble gas (the argon-instability mechanism applies to He), so p can be non-monotone at constant Q, which breaks the equivalence in both directions.
- RECALLED — helium is soluble in fused silica, so wall re-dissolution is a real (if small) sink that makes p(T) *lower* than ∫Q/V, which makes a pressure spec looser than the integral spec, not tighter.
Seal (sha-256, single-writer): 8b2b7fe85fdbf5afe486aa766ba068c5eef99c0d59603c2393940e903f8320b9
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