use of the focusing multi-slit ion optical system at the diagnostic injector rudi
DESCRIPTION
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 PresentationTRANSCRIPT
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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
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Madrid
Padova Lausanne
Juelich
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List of NBI parameters
TEXTOR DNBI
ALCATORDNBI
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
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NBI with focused beam (40 kV, 40 A, 1 s, and >10 kW/cm2)
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Atomic driver based on arc generator
Lanthanum hexaboribe thermocathode
Arc-discharge channel
Converter
H
Water cooling
0
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Multi-head source based on arc generators
Atomic driverEmitter region
Expander
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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
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Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
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Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
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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°
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Round and slit RUDI beamlet geometries
BEAM
U1=50 kVU2=43 kV
U3=-500 V
U4=0 V
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Slit RUDI grids photos
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Beam components scans across the slits at 45 kV
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RUDI beam divergence scan at 45 kV (6,6 kV 1st gap)
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Modernized RUDI arc-discharge plasma generatorEnhanced anode shape
O-rings sealed arc channel version
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CH1: Arc Current (100 A/check)CH2: Arc voltage (20 V/check)
CH1: HV (10 kV/check) CH2: Beam current (1 A/check)
RUDI 8 second shot oscillorgammes
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RUDI typical beam species composition
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Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
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Charge-eXchange Recombination Spectroscopy
Lower observation system
Upper observation system
H-beam
DED
Toroidal observation
system
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TEXTOR plasma density traces (ne (line average))
n*1013, cm-3
4
3
2
1
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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.
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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.
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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)
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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
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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]
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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
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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!