{"schema":"pubphys.bundle/1","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 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