{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"320f66aebd548daf66907095ae1112ad49606f67c3a9684dff87117cdd6dca37","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"0dcdb4d7f6996109f3f7013034f71ee39c71d9edeaf46ed6a2c75a2ccba816ab","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"plasma.kinetic-turbulence-dynamo.lab-dynamo-low-pm","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Laser experiments have shown turbulent plasma amplifying a magnetic field when the gas's viscosity and electrical resistance are comparable. In stars and planets resistance is much larger than viscosity, and no laboratory plasma has shown a dynamo in that regime.","posed_since":"","precise":"Laser-plasma experiments (2018, 2021) amplified seed fields by fluctuation dynamo at magnetic Prandtl number $\\mathrm{Pm} = \\mathrm{Rm}/\\mathrm{Re}$ near 1. Determine experimentally whether the fluctuation dynamo operates in a plasma with Pm much less than 1 and measure its critical Rm and growth rate. An answer is a measured dynamo threshold compared with the MHD prediction of a higher critical Rm at low Pm.","problem_ref":null,"references":"","settled_by":"A laboratory plasma at Pm much less than 1 and Rm above the predicted threshold, with time-resolved field measurements showing exponential growth.","status_note":"","title":"Laboratory plasma dynamo at low magnetic Prandtl number","topic_ref":"0fbe23e43e59314b73b802e78f2d2325c4a6b8b6a539d5dd3f6690b91375cb5f"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"6a804f6085e89608edfdeb3f6789fa014be429f5e2e5b800327773dcc17e147f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"a66d36aae50faec3103fab2191135ab8fc3e776aa40370e045598fad82cd1088","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"YucXRyDLyVyR19rQzaYbmXF2uY9TyPnAVFpAXOETCVAZSp296MLYx4q2ZrdGusaHFYEJXZr6dwULkmVSpgVUCg"},"schema":"pubphys.envelope/1"},"record_hash":"6a804f6085e89608edfdeb3f6789fa014be429f5e2e5b800327773dcc17e147f","leaf_index":1848}