MHD Dynamos in the Lab and Dynamos Beyond MHD. The lab plasma dynamo does Generate current locally Increase toroidal magnetic flux Conserve magnetic helicity.

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Presentation transcript:

MHD Dynamos in the Lab and Dynamos Beyond MHD

The lab plasma dynamo does Generate current locally Increase toroidal magnetic flux Conserve magnetic helicity Act through alpha and other effects Arise from fluctuations superposed on the mean field Achieve a nonlinearly saturated steady state (with full backreaction) The lab plasma dynamo does NOT Generate magnetic field from a small seed field Increase magnetic energy (it redistributes magnetic field)

in experiment E || j || radius additional current drive mechanism (dynamo)

Measure quantities during discrete dynamo event Toroidal Magnetic Flux (Wb) MST time (ms)

The MHD Dynamo

The nonlinear dynamo energy source instability dynamo MHD dynamo analytical quasilinear theory, nonlinear MHD computation

tasks Measurements of dynamo Active flow drive Connections to more general problem

MHD Dynamo: Status of Past Measurements edge measurements with probes, core with passive Doppler spectroscopy Important in edge and core, but not full story

time (ms) r/a = 0.9 MHD dynamo dominant at some radii, not everywhere r/a = 0.8 Measurement of MHD dynamo Volts m Volts m time (ms) r/a = 0.9 r/a = 0.8

MHD Dynamo Measurements (~ 3 year project) Measure spatial profile of in MST good progress in CHERS for v - now debuting laser Faraday rotation improving (B) motional Stark effect in several years (B) probes for edge Measure dynamo and helicity changes in MRX probes

SXR imaging of dynamo instabilities information on 3D structure of magnetic field, collaboration with RFX team (P. Franz, P. Martin, L. Mirelli) spatial resolution being improved

Active Flow Drive Present experiments: Flow drive experiments Exploratory: flow drive via neutral beam injection, inject ~ 25 keV beam of neutral atoms, transfers momentum to plasma

Test experimental feasibility in MST Beam installed; momentum transfer tested in few months If good absorption, then model with MHD computation, implement in MST and MRX from Novosibirsk

Investigate why alpha effect ( ) large in lab, small in geometrically simpler computation Specifics of flow pattern?

dynamo effects beyond MHD

Effects from Two-Fluid Theory parallel mean-field component, Linear part, Using in top eqn, MHD Hall Pressureless MHD diamagnetic

|| + dynamo = || Dynamotheory status MHDQL, NL comp HallQL Diamagneticvery little KineticRR, constraints from Landau resonances

Status of non-MHD effects Diamagnetic dynamo observed in edge probe measurements under some conditions Hall dynamo observed in MST recently

Hall dynamo measured by laser Faraday rotation (Ding, Brower, Deng) 11-chord FIR laser rotation angle

Experimental Goal Determine locations and conditions at which different dynamo mechanisms dominate

Experimental Plans Measure diamagnetic dynamo (probes in MST and MRX, explore Thomson scattering for p e ) Measure v e x B (= v x B + j x B/ne) (explore laser Fizeau effect for v e, ) Measure Hall dynamo with improved spatial resoluton (Faraday rotation, MSE, probes)

Hall Dynamo Theory and Computation Expand quaslinear calculation to finite pressure Develop early nonlinear theory (Rutherford theory) Develop two-fluid computation for lab plasma (Nimrod)

Related work: Two-fluid computation in a box shows Hall dynamo important under some conditions (Minnini, Gomez, Mahajan)

Ongoing Assessment of astrophysical relevance of various dynamo effects