{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"7481c94bd5cffda97f941d72597274ebb00d0c93b5618fdf823a804aa6159ad3","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"44a09ca484ee9e29c37bbb1d63d120267f609d5fc382a1f8d2efeb8760550e3d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"beams.rf-breakdown.local-field-criterion","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Engineers judge whether a new structure will spark using rules of thumb based on surface field, surface heating or energy flow; it is unknown whether one quantity works for all designs.","posed_since":"","precise":"Candidate criteria include the peak surface electric field, the pulsed surface temperature rise $\\Delta T$, and the modified Poynting vector $S_{c} = \\operatorname{Re}(S) + \\operatorname{Im}(S)/6$ proposed in 2009. Determine whether a single local quantity predicts the breakdown-limited gradient across structure geometries, frequencies $1\\text{-}30\\,\\mathrm{GHz}$ and DC spark systems to within 20 percent at fixed breakdown rate and pulse length, or whether the limit is irreducibly geometry dependent.","problem_ref":null,"references":"","settled_by":"A blind comparison of predicted and measured limits for a set of structures differing in geometry and frequency.","status_note":"","title":"Which local field quantity determines the breakdown-limited gradient","topic_ref":"29c52025bad0f3bb40505db955939f35befc6ea9256f5e4972142fac9de7c602"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"1232e316b4be45583bb6dcd5ac916d6816dc4afc88101513c9accd1e54df653b","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"30a9c278936f0279ef37fb320286d34a5e966a3d82471bfb3d0fa09857001140","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"77o83BQ-gFbNbJrEwVV_7-v0-obw492Y8hiEDxNnCgJC5wCPWC_QuttN6P72WTcr5fGPM212zX27nQIT8F7TAQ"},"schema":"pubphys.envelope/1"},"record_hash":"1232e316b4be45583bb6dcd5ac916d6816dc4afc88101513c9accd1e54df653b","leaf_index":694}