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 - PowerPoint PPT Presentation
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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
NBI with focused beam (40 kV, 40 A, 1 s, and >10 kW/cm2)
Atomic driver based on arc generator
Lanthanum hexaboribe thermocathode
Arc-discharge channel
Converter
H
Water cooling
0
Multi-head source based on arc generators
Atomic driverEmitter region
Expander
Arc generator as the source of dense particle flux
Arc plasma source
Magnetic coil transporting system
Sample surface
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.
B ~ 1 kGs
Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
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°
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)
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
1 s is enough for Ti and almost enough for rotation analysis
Ion Temperature measurements:
Analyzed intervals for 1.3-3.1 s, 3.1-4.1 s, 4.1-5.5 s.
Poloidal velocitymeasurements:
Ti[eV]
R[m]
v[km/s]
R[m]
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
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