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Träfflista för sökning "WFRF:(Soldan C. Paz) srt2:(2016)"

Sökning: WFRF:(Soldan C. Paz) > (2016)

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1.
  • Paz-Soldan, C, et al. (författare)
  • Synchrotron and collisional damping effects on runaway electron distributions
  • 2016
  • Ingår i: 58th Annual Meeting of the APS Division of Plasma Physics. ; 61:18, s. CO4.00010 -
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Validated models of runaway electron (RE) dissipation are required to confidently approve safe ITER Q=10 operation. DIII-D experiments using quiescent REs are exploring the importance of synchrotron and collisional damping terms to RE dissipation. New time and energy-resolved measurements of RE bremsstrahlung hard X-ray (HXR) emission reveal stark differences between high and low energy REs as damping terms are varied. Previously reported anomalously high RE dissipation only applies to low energy REs. At high energy (where synchrotron effects are strongest) low synchrotron damping cases reach higher peak RE energy despite weaker particle confinement. Low-energy RE decay is observed concurrently with high-energy RE growth. RE dissipation models predict bump-on-tail distributions whose properties depend on the damping terms. Measured HXR spectra are very broad, as expected for bump-on-tail distributions.
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2.
  • Paz-Soldan, C., et al. (författare)
  • The non-thermal origin of the tokamak low-density stability limit
  • 2016
  • Ingår i: Nuclear Fusion. - : IOP PUBLISHING LTD. - 0029-5515 .- 1741-4326. ; 56:5
  • Tidskriftsartikel (refereegranskat)abstract
    • DIII-D plasmas at very low sity exhibit the onset of n = 1 error field (EF) penetration (the 'low-density locked mode') not at a critical density or EF, but instead at a critical level of runaway electron (RE) intensity. Raising the density during a discharge does not avoid EF penetration, so long as RE growth proceeds to the critical level, Penetration is preceded by non-thermalization of the electron cyclotron emission, anisotropization of the total pressure, synchrotron emission shape changes, as well as decreases in the loop voltage and bulk thermal electron temperature. The same phenomena occur despite various types of optimal EF correction, and in some cases modes are born rotating, Similar phenomena are also found at the low -density limit in JET, These results stand in contrast to the conventional interpretation of the low -density stability limit as being due to residual EFs and demonstrate a new: pathway to EF penetration instability due to REs, Existing scaling laws for penetration project to increasing EF sensitivity as bulk temperatures decrease, though other possible mechanisms include classical tearing instability, thenno-resistive instability, and pressure -anisotropy driven instability, Regardless of the first-principles mechanism, known scaling laws for Ohmic energy confinement combined with theoretical RE production rates allow rough extrapolation of the RE criticality condition, and thus the low -density limit, to other tokamaks. The extrapolated low -density limit by this pathway decreases with increasing machine size and is considerably below expected operating conditions for I FER, While likely unimportant for ITER, this effect can explain the low -density limit of existing tokamaks operating with small residual EFs.
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