{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2fdd8e915cea139f83c2b02a6a265643f3445184167d4fbc5f9739e87d6d7f30","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":["ai:gpt-5.5"],"kind":"seed"},"parents":["b2ee2aba3f3c05bae3f2a3dc8fa8e068fab85649073fb1d24b1f753c4a645593","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"a601d8727bc6d4064443605815c930514ffe4660bb6d3a5ecd13f647bc0ce3fa","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":["ai:gpt-5.5"],"external_id":"beams.advanced-structures.dielectric-gv-breakdown","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Dielectric tubes driven by very short electron bunches survive fields far above what copper tolerates, then fail at a threshold whose cause is unclear.","posed_since":"","precise":"Fused-silica and diamond structures driven by sub-picosecond electron bunches ($\\sigma_z$ $\\sim 2 \\times 10^{-3}$ to $10^{-2}$ cm) sustained surface fields of order $eE \\sim 100\\ \\mathrm{MeV}/\\mathrm{cm}$ before damage (SLAC experiments from 2008 onward). Determine the damage mechanism and its scaling with field duration from 0.1 to 10 ps and with band gap, separating field-induced ionization, heating by beam halo, and surface charging.","problem_ref":"b2ee2aba3f3c05bae3f2a3dc8fa8e068fab85649073fb1d24b1f753c4a645593","references":"","settled_by":"Threshold measurements versus pulse duration for at least two materials of different band gap, compared with ionization and heating models.","status_note":"","title":"Damage mechanism of dielectrics under picosecond wakefields","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"51ffc13c94f1034d30c796c5080d8960495f65e309f47816cea99bcc031fa69a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e191abb6ae904de5c8824b147c093179a9a1563215b739e3d294f8f8a7e7a302","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"X8bcrXDlt-nT_GSu_EWunfYvlaJ-jGiJlYgt1yJ7gb0ROU5GjhmqIkKueWDKftPo9UI6wAGsMzVEhd98CcXECA"},"schema":"pubphys.envelope/1"},"record_hash":"51ffc13c94f1034d30c796c5080d8960495f65e309f47816cea99bcc031fa69a","leaf_index":2448}