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Active Beam Spectroscopy in Hot Fusion Plasmas (Beam Emission Spectroscopy and MSE)

Active Beam Spectroscopy in Hot Fusion Plasmas (Beam Emission Spectroscopy and MSE). Manfred von Hellermann FOM Institute for Plasma Physics Rijnhuizen, NL. Seminar-III Institute for Plasma Physics Academy of Sciences Hefei, China May, 7, 2007. Acknowledgement:

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Active Beam Spectroscopy in Hot Fusion Plasmas (Beam Emission Spectroscopy and MSE)

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  1. Active Beam Spectroscopy in Hot Fusion Plasmas (Beam Emission Spectroscopy and MSE) Manfred von Hellermann FOM Institute for Plasma Physics Rijnhuizen, NL Seminar-III Institute for Plasma Physics Academy of Sciences Hefei, China May, 7, 2007 Acknowledgement: CXRS groups at JET, TEXTOR, Tore Supra , ASDEX-UG and members of the ITPA expert group on Active Beam Spectroscopy

  2. Beam Emission Spectroscopy as tool for absolute calibration of CXRS signals Combination of CXRS and BES: common line of sight and beam geometry M. von Hellermann

  3. First observation of a CXRS D-alpha spectrum on JET 1986 Alain Boileau, PhD Thesis, University of Montreal 1988 M. von Hellermann

  4. W.Mandl 1991, first fully modelled Balmer-alpha-CX and beam spectrum M. von Hellermann

  5. Beam Emission Rate vs. collision energy and electron density c.f. ADAS file ADF312 M. von Hellermann

  6. Beam Emission Rate versus collision energy and ion temperature ADAS file ADF312 M. von Hellermann

  7. Beam Emission rate versus collision energy and C+6 concentration M. von Hellermann

  8. Combination of CXRS and BES enables deduction of ion densities without absolute calibration and measurement of optical transmission local concentration measurements reduced to a line ratio measurement Note: Atomic rates Q depend on energy, electron and ion densities and temperatures M. von Hellermann

  9. Comparison of beam line-densities derived from beam stopping and beam emission respectively M. von Hellermann

  10. TEXTOR comparison of beam line-densities from beam stopping and beam emission respectively M. von Hellermann

  11. Questions: • Is the deviation between beam-stopping beam • densities and beam-emission deduced beam • densities due to: • Geometry factors, alignment, beam dimensions ? • Errors in beam stopping cross-sections ? • Errors in beam emission rates ? • Do we need to establish further experiments ? • Do we need to review atomic physics ? M. von Hellermann

  12. D-alpha-BES and D-alpha-CXRS Robert Wolf 1993 M. von Hellermann

  13. Ratio of Pi-over-Sigma Group in JET MSE spectrum M. von Hellermann

  14. M. von Hellermann

  15. M.von Hellermann et al., ITER report December 2003 M. von Hellermann

  16. s0 D-alpha-edge s+ s- D-alpha-CX p+3 p+4 p+2 p-2 p-3

  17. M. von Hellermann

  18. MSE ratio p/s for U-ports 2 &3 U-port 2 U-port 3 M. von Hellermann

  19. The most accurate data extracted from the beam spectrum is the Lorentz split representing the total magnetic field as local measurement. This offers a promising back-up to pick-up coils and magnetic field measurements making use of electronic integrators. Expected accuracies are better than 0.5% M. von Hellermann

  20. R.C.Wolf, L-G Eriksson, M von Hellermann, R.König, W.Mandl, F.Porcelli Nuclear Fusion, 33, 1835(1993), JET-P(93)24 M. von Hellermann

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