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Bidirectional outflow jets in the SSX reconnection experiment

Bidirectional outflow jets in the SSX reconnection experiment. Michael Brown Swarthmore College, NSF Center for Magnetic Self-Organization Chris Cothran, Tim Gray, David Cohen, Vernon Chaplin ’07, Lake Bookman `08, Anna Phillips `10 M. J. Schaffer E. V. Belova

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Bidirectional outflow jets in the SSX reconnection experiment

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  1. Bidirectional outflow jets in the SSX reconnection experiment Michael Brown Swarthmore College, NSF Center for Magnetic Self-Organization Chris Cothran, Tim Gray, David Cohen, Vernon Chaplin ’07, Lake Bookman `08, Anna Phillips `10 M. J. Schaffer E. V. Belova Research supported by US DOE and NSF

  2. The SSX Laboratory 10kV/100kA Pulsed power Cylindrical flux conservers and vacuum chamber (=0.40m, L=0.65m) Coaxial magnetized plasma guns on each end (1 mWb)

  3. SSX parameters

  4. Spheromak formation

  5. 2D MHD simulation

  6. Tangled 3D magnetic lines (lab and solar) 5 earth diameters tall one foot tall

  7. Reconnection geometry (2D model) Separatrix Current flow (out) Electron flow (in) Inflow (slow) Electron Diffusion Region Outflow (fast, Alfvenic)

  8. Simulation results: 3D resistive MHD (E. Belova, PPPL)

  9. 3D hybrid simulation (Y. Lin) Kinetic ions (5x108 ions), fluid electrons

  10. Local 3D probe measurements Right-handed Spheromak Left-handed spheromak Reconnected poloidal flux

  11. SSX device (distributed probe array) • Opposing magnetized plasma guns • Close fitting copper flux conserver • Midplane IDS access for flow studies

  12. Outflow jets in SSX • Ion Doppler spectroscopy (jets, heating) • Electron heating (soft x-rays, vacuum ultraviolet) • New results (gas doping and oblate structure)

  13. Bi-directional outflows in SSX High resolution ion Doppler spectroscopy (Cothran, et al, PRL to be submitted J. Fung thesis ‘06)

  14. Ion Doppler Spectroscopy (1.33m)

  15. Ion Doppler Spectroscopy (1.33m)

  16. Ion Doppler spectrometer layout

  17. IDS line shapes (high resolution)

  18. Observation of bi-directional outflow Data is effectively f(v_r)… one pixel is 10 km/s

  19. Stills from IDS movie Dynamics of the flow (bursts, turbulence) encoded in the lineshape

  20. Bi-directional outflows on the sun D. Innes (SOHO SUMER chromosphere) Innes, Nature, 1997 Innes, Solar Physics, 1997

  21. Location of SUMER slit on solar disk SiIV light dispersed along slit

  22. Velocity resolution 10 km/s Spatial resolution 1000 km Spatially localized events

  23. Hot ions in SSX Cothran, et al (SSX) (low density discharges, after glow discharge conditioning, short gas delay)

  24. Hot ions in SSX (merging)

  25. IDS hot ion temperature measurement

  26. IDS hot ion flow measurement

  27. Scaling of Ti with density

  28. Scaling of Ti with density (single sph) Dipole-trapped, Gaussian fit, early in formation (30-40 ms)

  29. Scan of ion mass (moderate density discharges 5 x 1014 cm-3, Different sources for impurity ions) Inconclusive results so far… THe and TSi appear hotter than TC… we are planning careful experiments for summer 2008

  30. IDS hot ion temperature measurement (HeII)… high density

  31. IDS hot ion flow measurement (HeII)… high density

  32. IDS hot ion temperature measurement (HeII)… low density

  33. IDS ion temperature measurement CIII 229.687 nm (electrodes)

  34. IDS ion temperature measurement HeII 467.57 nm (1% doped)

  35. IDS ion temperature measurement HeII 468.57 nm (1% backfill)

  36. IDS ion temperature measurement SiII 462.172 nm (quartz probes)

  37. Outflow jets (CIII)

  38. Outflow jets (HeII)

  39. Hot ions in the extended corona Cranmer, Space Science Rev, 2002 (UVCS)

  40. UVCS line of sight

  41. Greater than mass ratio ion temperatures

  42. Greater than mass ratio ion temperatures

  43. Collier (1996)

  44. Hot electrons in SSX Vernon Chaplin ’06 and David Cohen (VUV spectrometer and soft x-ray array)

  45. Typical calculated spectra 12 eV case 28 eV case

  46. SXR responsivities with spectrum

  47. Sample SXR signals Anomalously strong signal in high energy bins… electron tail?

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