Use of the focusing multi-slit ion optical system at the diagnostic injector RUDI
description
Transcript of 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.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
Madrid
Padova Lausanne
Juelich
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
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°
Round and slit RUDI beamlet geometries
BEAM
U1=50 kVU2=43 kV
U3=-500 V
U4=0 V
Slit RUDI grids photos
Beam components scans across the slits at 45 kV
RUDI beam divergence scan at 45 kV (6,6 kV 1st gap)
Modernized RUDI arc-discharge plasma generatorEnhanced anode shape
O-rings sealed arc channel version
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
RUDI typical beam species composition
Outlines
• RUDI modernization overview
– New ion-optical system
– Optical diagnostic setup
– Metal ceramic arc element
• CXRS measurements
• Summary and outlook
Charge-eXchange Recombination Spectroscopy
Lower observation system
Upper observation system
H-beam
DED
Toroidal observation
system
TEXTOR plasma density traces (ne (line average))
n*1013, cm-3
4
3
2
1
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.
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.
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
Thank you very much!