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04/11/23ReportYY
EUV Spectroscopy of Tungsten Observed EUV Spectroscopy of Tungsten Observed in SH-Htsc EBIT and related Calculationsin SH-Htsc EBIT and related Calculations
Yang YangYang YangShanghai EBIT LaboratoryInstitute of Modern Physics, Fudan University, Shanghai, China@ADAS Workshop 2014, Warsaw, Poland, 30th Sep. 2014
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
Outline:
1. Much Attentions to Tungsten Spectroscopy
2. Devices well fit the measurements of EVU
Spectroscopy of Tungsten
3. Experimental Results (Preliminary)
4. Calculation methods and results
5. Comparisons between experiments and calculations
6. Identification of Ground state of W13+
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ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
1. Much Attentions to Tungsten Spectroscopy
• A strong candidate for plasma facing material for future fusion devices, such as ITER
• High radiation power which may degrade the plasma performance
• Great need of tungsten spectroscopy for ITER diagnostics was pointed out by Skinner in 2006.
• Little spectroscopic data Little spectroscopic data for tungsten in EUV
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ITERITER
WW
From a talk given by Charles Skinner at the “20 Years of EBIT Spectroscopy” held in Berkeley in 2006
DivertorDivertor
(20nm-40nm)
Only Only 55 lines from lines from WXII-WXVIIWXII-WXVII
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
2. DevicesDevices well fit the measurements of EVU Spectroscopy of Tungsten
• Shanghai High Temperature Super-Conductor EBIT(SH-Htsc EBIT)
• High resolution extreme ultraviolet (EUV) and soft x-ray spectrometer
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SH-Htsc EBITSH-Htsc EBITEe 30-4000 eV
Ie 10 mA
re ~120 μm
Vacuum <1.0e-9 Torr
Magnetic field
0-0.25 T
Flat-Field Grating Flat-Field Grating SpectrometerSpectrometerVacuum 1.0×10-9 Torr
Wavelength Range
1-50 nm
Resolving Power (λ/Δλ)
>1000Z. Shi, et al., Rev. Sci. Instrum. 85, 063110 (2014)
J. Xiao, et al., Proceedings of IPAC2013 MOPFI066 (2013)
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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Fig. Spectrum for Calibration taken at a beam energy of 120 eV and a current of 8.1mA. Oxygen and Nitrogen are from the residual gas in the SH-Htsc EBIT
3. Experimental Results
Operation ParametersOperation Parameters
Ee 200-400 eV
Ie 8.1 mA
Gas Injection W(CO)6
Injection Pressure
6.0×10-8
Vacumm < 1.0×10-9
- Calibration first
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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Spectra taken at beam energies from 200 to 410 eV
The ionization potential of W10+ to W15+ *
* A.E. Kramida and T. Shirai, Atomic Data and Nuclear Data Tables 95, 305C474 (2009)
3. Experimental Results
Most spectral lines were seen in the region between 170-260 ÅMost spectral lines were seen in the region between 170-260 Å
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
4. Calculation methods and results
Flexible Atomic Code(FAC)*
- Relativistic Configuration-Interaction(RCI)
- Collisional-Radiative Modeling (CRM)
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* M. F. Gu, Canadian Journal of Physics 86, 675 (2008)
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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4. Calculation methods and results
Configurations used in the RCI model of W11+ ~ W15+
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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4. Calculation methods and results
The synthetic spectra of W10+ to W15+ with CR model
Results after CRM calculation and line broading:
Ee=230,270,310,350,390eVNe=5.0×10-10 cm-3
Resolving Power = 850 (for simulation)
Most distinct lines lay on wavelengths between 160Å ~ 270Å, that is coincident with experimental results
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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4. Calculation methods and resultsSummary about the transitions contributing to the spectra
The synthetic spectra of W10+ to W15+ with CR model
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
5. Comparisons between experiments and calculations
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The synthetic spectra of W10+ to W15+ with CR modelExperimental spectra of W10+ to W15+
• Slight shift in wavelength
• packages of peaks are wider.
•Δn = 0160-190Å 5d → 5p210-260Å 5p → 5s
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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5. Comparisons between experiments and calculations
Quasi-continuum spectra around 30nm observed in LHDMany Thanks to Suzuki san.
Comparison with LHD spectra
ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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6. Identification of Ground state of W13+
spectrum was recorded on Berlin EBIT at beam energy of 300eV
4f135s2 4f145s
resonance doublet lines
no yes
C. L and E. D. Alkalilike, Physical Review Letters 45(26), 2099 (1980) T. C. E and R. V., Physical review. A, General physics 28(2), 1186C1188 (1983)A. K. a and T. Shirai, Atomic Data and Nuclear Data Tables 95, 305C474 (2009)R. Hutton, Y. Zou, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 205, 114 (2003)
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ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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6. Identification of Ground state of W13+
the level structure of W13+ from RCI method
Experimental spectra at 320eV
Synthetic spectra at 310eV
4f135s2
Visible transitions: Z. Z. Zhao, submitted (2014)
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ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
Summary
• EUV Spectra of W11+ ~ W15+ ions have been studied both experimentally and theoretically. Preliminary comparison between them have been done.
• Identification of the ground-state configuration of W13+ has been done, which shows 4f135s2 should be the lowest configuration.
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ADAS Workshop 2014 - Warsaw, Poland 30ADAS Workshop 2014 - Warsaw, Poland 30 thth Sep. 2014 Sep. 2014
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Thank you for your attention !
Members in Shanghai EBIT Laboratory