1. High-resolution X-Ray diagnostic upgrade for ITER-like wall experiments at JET
Amy Shumack
ADAS workshop 29/9/14

2. The X-Ray spectrometer and upgrade Identification of W and Mo lines
Overview
The X-Ray spectrometer and upgrade
Identification of W and Mo lines
Other lines that we can measure
Determination of plasma parameters

3. Introduction
ITER
JET
JET ITER-like wall

4. X-Ray spectroscopy High resolution X-Ray spectroscopy core:
impurity concentration
ion temperature
rotation velocity
#61098

5. KX1 – X-Ray crystal spectrometer
Line of sight – 20 cm below average magnetic axis

6. Johann configuration
Not to scale

7. Vignetting – ITER-like wall
Not to scale

8. Vignetting – ITER-like wall
Not to scale
All orders
of reflection
collected
simultaneously

9. Spectrometer upgrade Wi46+ and Mo32+ lines Ni26+ line Mo32+ W46+
1. New crystals
Wi46+ and
Mo32+ lines
Bragg angle Te
Ni26+ line
Ni26+
2. GEM (Gas Electron
Multiplier) detectors and DAQ system

10. *Institute of Plasma Physics and Laser Micro-fusion, Poland
GEM detectors
*Institute of Plasma Physics and Laser Micro-fusion, Poland
GXS project (“Gas Electron Multiplier Detector for X-ray Crystal Spectrometry” )
GEM detectors developed by IPPLM* to replace old MWPC detector
Triple-GEM detector
GEM foil
70 μm
140 μm
(256
Signal processing:
GEM
Detectors
(256 strips)
Signal
amplification
ADCs
77.7 MHz
FPGA
Analysis
(events  counts)
Counts

11. Mo32+ L-shell transitions
Line identification
W46+ M-shell transition
4d-3p
Mo32+ L-shell transitions
3s-2p
W44+ M-shell transition ?
???
M2*
Shot nrs:

12. KX1 – Molybdenum laser blow-off experiment
Line identification
KX1 – Molybdenum laser blow-off experiment
(Only) suspected Mo lines became significantly more intense
JPN85232
Mo LBO at 58 s
FAC code calculation*
at 5 keV with equal Mo32+,W45+ and W46+ density
*T. Nakano et al., Proceedings of the 41st EPS conference on plasma physics, 2014

13. Other lines 2.65A 5.3A 3.2A Mo32+ (M2) Mo32+ (3G) W45+ W46+
W 1st order
W 2nd order
Mo32+
(M2)
Mo32+
(3G) s
6keV, 6E19
W45+
W46+
2.65A
Increases for Ti LBO
5.3A
86535 s
5keV, 8E19
Ni 1st order
3.2A
86592 s
7keV, 6E19
Ar16+?

14. Obtaining plasma parameters - Ni
Ni26+ spectral lines
w: 1s2p 1P1 -> 1s2 1S0
x: 1s2p 3P2 -> 1s2 1S0
y: 1s2p 3P1 -> 1s2 1S0
Dielectronic satellite line n=2
t: 1s2s2p 2P1/2 -> 1s22s 2S1/2
Feature dielectronic satellite lines
n>=3. w x t
Feature consisting of
dielectronic satellites,
fit with fn depending on Te
Gaussian functions
Voigt function
130 ms
integration
time y
Divide by vignetting function
Least squares fit
 Ti, ωNi26+, Ni. conc.

15. KX1=X-Ray spectrometer
Plasma parameters - Ni
KX1=X-Ray spectrometer
r/a=
r/a=
Ti KX1
Te HRTS

16. Obtaining plasma parameters – W/Mo analyzer
W and Mo analyzer GUI*
εline = nW46+ . ne . PEC line
I line = nW∫ FAW46+ .ne. PEC line dl
assuming const. nW
FA: calculated from ADAS ionization /recombination coefficients assuming coronal equilibrium
PECs: calculated with FAC code
W46+
Mo32+
*T. Nakano et al., Proceedings of the 41st EPS conference on plasma physics, 2014

17. W and Mo concentrations
Preliminary data
W conc.
Mo conc.

18. JET high resolution X-Ray crystal spectrometer upgraded
Conclusion
JET high resolution X-Ray crystal spectrometer upgraded
W and Mo lines identified
Many other non-identified lines…
T, ω, n determined for Ni ions
Preliminary W and Mo concentrations

20. Extra slides

21. Separation of orders of reflection
Ni+26
1st
2nd
Argon
escape
peak
Pulse height spectra
Diffraction spectra

22. 3.1A 5.3A 2.65A 1.6A W. Position, θBragg= 51.1º, arm shift = 101.6cm
86811, 5keV, 1MW ICRH, 20MW NBI (2.5 sec)
Ni detector
W detector
Δλ=4.3 pm
Δλ=1.3 pm
1st order
1st order ?
5.3A
3.1A
W46+
Mo32+ ? ?
2nd order
2nd order
2.65A
1.6A
Increases for Ti LBO

23. Ni. Position, θBragg= 52.6º, arm shift = 6.1cm
86529, 4keV, 1MW ICRH, 17MW NBI (6 sec)
W detector
Ni detector
Δλ=4.3 pm
Δλ=1.3 pm
1st order
1st order
3.2A
5.4A ?? ??
Ar16+? ??
2nd order
2nd order
1.6A
2.7A

24. SUPPLIED BY HUGH SUMMERS ON 20.05.88
 corrected on  
 WITH AN ELECTRON DENSITY OF  0.500E+14 CM**(-3)
 FOR CHARGE STATES Z=1 TO Z=25
 IONISATION RATES IN FILE 'IONISE'
 TOTAL RECOMBINATION RATE IN FILE 'RECOMB'
 FOR CHARGE STATES Z=23 TO Z=25
 RADIATIVE RECOMBINATION RATES IN FILE 'RADIAT'
 DIELECTRONIC RECOMBINATION RATES IN FILE 'DIELEC'
 FRACTIONAL ABUNDANCES IN FILE 'ABUNDAN'
 CALCULATED WITH ABEL-VAN-MAANENS SUBROUTINES ON THE CRAY2
 ON WITH 'JETXAY.CRAY(CORONA)'
 excitation rates and constants for dielectronic recombination
 in form of tables from Phys.Rev.A37,506 (F.Bombarda et al)
 all stored in NI26...., NI etc, which means
 the rates describe transitions with NI26 etc. as starting ion

25. Spectral width of detector: 0.01,0.04 Å
Resolution: ~ 10-4,10-3Å !!
Spectral width of detector: 0.01,0.04 Å
Total spectral range: ~0.1,0.4 Å

26. Identified lines:
W46+ : 3p6 3d10 1S0 - 3p5 3d10 4d (3/2, 5/2) 1:λ= nm*
Mo32+ : 2p 1S0 - 3s 3P1 : λ = nm* (3G)
Mo32+ : 2p 1S0 - 3s 3P2 : λ = nm (M2)
W45+ : 3p6 3d10 4s 2S1/2 - 3p5 3d10 4s 4d (3/2, 2) 1/2: λ = nm*
W45+ : 3p6 3d10 4s 2S1/2 - 3p5 3d10 4s 4d (3/2, 3) 3/2: λ = nm*
* Wavelength from NIST[6]

27. *K.B. Fournier, Phys Rev E, 53, 1084, 1996 TFU
E. Kallne, J. Kallne and R.D. Cowan, Phys. Rev. A 27 (1983) C-MOD

28. W. Position, θBragg= ?51.2º, arm shift = ?98.0 cm
86870
W detector
1st order
5.3A
2nd order
2.65A s
Titanium LBO

29. Cmo/CW increased: 0.05 in 2013 => 0.2-0.3 in 2014
Const. Dl assumed
Hybrid pulse:
W46+, W45+ and Mo32+ seen as in 2013
Typically cW~ 3e-5, cMo~5e-6 =>cMo/cW~
It seems Mo events distribute Mo sources.
Baseline pulses:
W45+ and Mo32+ (M2) disappeared
Instead, unidentified lines appeared
(shown by arrows)
Suggests Another metal impurities???
Typically cW~ 2e-6, cMo~6e-7=>cMo/cW~

30. W. Position, θBragg= ?51.2º, arm shift = ?98.0 cm
87229, ?keV, ?MW ICRH
W detector
Ni detector
1st order
1st order
5.3A
3.1A
2nd order
2nd order
2.65A
1.6A

31. Vignetting
Not to scale
Line averaged data