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Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI

Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI. A.Listopad 1 , J.Coenen 2 , V.Davydenko 1 , A.Ivanov 1 , V.Mishagin 1 , V.Savkin 1 , G.Shulzhenko 1 , B.Schweer 2 and R.Uhlemann 2 1 Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, RUSSIA

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Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI

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  1. Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI A.Listopad1, J.Coenen2, V.Davydenko1, A.Ivanov1, V.Mishagin1, V.Savkin1, G.Shulzhenko1, B.Schweer2 and R.Uhlemann2 1Budker Institute of Nuclear Physics SB RAS, 630090 Novosibirsk, RUSSIA 2 Trilateral Euregio Cluster, Institut fuer Energie- und Klimaforschung, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, 52425 Juelich, Germany 1A.A.Listopad@inp.nsk.su

  2. Juelich Madrid Lausanne Padova

  3. TEXTOR DNBI ALCATOR DNBI TAE HNBI MST HNBI Beam energy, keV 20-50 20-55 20-40 25 Max. extracted current, A 3 6.5 40 50 Duration, s 8 2 1 0,02 Beam divergence, degrees 0,35 x 0,6 0,55 1 1,2 Ion species, % (by current) 85/10/5 90/5/5 70/10/20 80/10/10 Diagnostic served CXRS MSE, CXRS List of NBI parameters

  4. NBI with focused beam (40 kV, 40 A, 1 s, and >10 kW/cm2)

  5. Water cooling Lanthanum hexaboribe thermocathode Arc-discharge channel Converter Atomic driver based on arc generator H 0

  6. Expander Atomic driver Multi-head source based on arc generators Emitter region

  7. Density of plasma flow at the anode outlet is 10*(14)/cm2. With the magnetic coil system this can be transported and focused with similar density at the sample surface. Arc generator as the source of dense particle flux Arc plasma source Magnetic coil transporting system B ~ 1 kGs Sample surface

  8. Outlines • RUDI modernization overview • New ion-optical system • Optical diagnostic setup • Metal ceramic arc element • CXRS measurements • Summary and outlook

  9. Outlines • RUDI modernization overview • New ion-optical system • Optical diagnostic setup • Metal ceramic arc element • CXRS measurements • Summary and outlook

  10. RuDI neutral beam injector Nominal beam parameters: • Energy of particles (Hydrogen) 50 keV • Ion current 3 A • Beam current in 50keV neutrals 1.5 A • Beam pulse duration 6-8 sec (modulated) • Focal length 4 m • Diameter 1/e (at the focal plane) 50 mm x 80 mm • Angular divergence ±0.35° x ±0.6°

  11. Round and slit RUDI beamlet geometries U1=50 kV U2=43 kV U3=-500 V U4=0 V BEAM

  12. Slit RUDI grids photos

  13. Beam components scans across the slits at 45 kV

  14. RUDI beam divergence scan at 45 kV (6,6 kV 1st gap)

  15. Modernized RUDI arc-discharge plasma generator Enhanced anode shape O-rings sealed arc channel version

  16. RUDI 8 second shot oscillorgammes CH1: Arc Current (100 A/check) CH2: Arc voltage (20 V/check) CH1: HV (10 kV/check) CH2: Beam current (1 A/check)

  17. RUDI typical beam species composition

  18. Outlines • RUDI modernization overview • New ion-optical system • Optical diagnostic setup • Metal ceramic arc element • CXRS measurements • Summary and outlook

  19. Charge-eXchange Recombination Spectroscopy Upper observation system DED H-beam Toroidal observation system Lower observation system

  20. TEXTOR plasma density traces (ne (line average)) n*1013, cm-3 4 3 2 1

  21. Shots 115838/115843; Ti measurements (total averaging 5.5 s). Flat top: 0.8 – 6.8 s, RUDI operation 1.3-7.5 s, Analyzed 1.3 – 6.8 s.

  22. Shots 115838/115843; vp measurements (total averaging 5.5 s). Flat top: 0.8 – 6.8 s, RUDI operation 1.3-7.5 s, Analyzed 1.3 – 6.8 s.

  23. Averaging 1 s (115845) vs 5,5 s intervals (115838, 115843) All the results of Ti measurements have very stable repetition (Even with 1 s time averaging)

  24. Shot 115845; Density Steps 1.2-3.1 s , 3.1-4.1 s , 4.1-5.5 s. n*1013, cm-3 4 3 2 1

  25. Analyzed intervals for 1.3-3.1 s, 3.1-4.1 s, 4.1-5.5 s. Ion Temperature measurements: Poloidal velocity measurements: Ti[eV] v[km/s]  1 s is enough for Tiand almost enough for rotation analysis R[m] R[m]

  26. Summary • Optical beam diagnostic complex was developed • New slit ion optics is introduced (June 2010) • Beam current achieved 2,8A (at 49 kV, due to HV PS power limit) • Beam diameter at 2m ~3cm along the slits • Beam species composition ~80% protons • More than 100% CXRS signal level rise • New arc-discharge element has provided 6-8 s beam duration

  27. Summary • Optical beam diagnostic complex was developed • New slit ion optics is introduced (June 2010) • Beam current achieved 2,8A (at 49 kV, due to HV PS power limit) • Beam diameter at 2m ~3cm along the slits • Beam species composition ~80% protons • More than 100% CXRS signal level rise • New arc-discharge element has provided 6-8 s beam duration Thank you very much!

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