High-resolution X-Ray diagnostic upgrade for ITER-like wall experiments at JET

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

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

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Introduction
ITER
JET
JET ITER-like wall
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X-Ray spectroscopy

• High resolution X-Ray spectroscopy
• core
• impurity concentration
• ion temperature
• rotation velocity

61098
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KX1 X-Ray crystal spectrometer
20m
Line of sight 20 cm below average magnetic axis
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Johann configuration
Not to scale
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Vignetting ITER-like wall
Not to scale
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Vignetting ITER-like wall
Not to scale
All orders of reflection collected simultaneously

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

GEM foil
Triple-GEM detector
70 µm
140 µm
(256

• Signal processing

Signal amplification
ADCs 77.7 MHz
GEM Detectors (256 strips)
FPGA Analysis (events ? counts)
Counts
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Line identification
Mo32 L-shell transitions 3s-2p
W46 M-shell transition 4d-3p
W44 M-shell transition
???
?
M2
Shot nrs 83735-83753
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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
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Other lines
W 1st order
W 2nd order
Mo32 (3G)
Mo32 (M2)
8660350.1-50.3s 6keV, 6E19
W46
W45
2.65A
Increases for Ti LBO
5.3A
86535 48.1-48.3s 5keV, 8E19
Ni 1st order
3.2A
86592 47.6-48.1s 7keV, 6E19
Ar16?
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Obtaining plasma parameters - Ni
Ni26 spectral lines w 1s2p 1P1 -gt 1s2 1S0 x
1s2p 3P2 -gt 1s2 1S0 y 1s2p 3P1 -gt 1s2
1S0 Dielectronic satellite line n2 t 1s2s2p
2P1/2 -gt 1s22s 2S1/2 Feature dielectronic
satellite lines ngt3.
130 ms integration time
y
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Plasma parameters - Ni
KX1X-Ray spectrometer
r/a0.2-0.4
r/a0.45-0.55
Ti KX1
Te HRTS
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Obtaining plasma parameters W/Mo analyzer
W and Mo analyzer GUI
eline nW46 . ne . PEC line
I line nW? FAW46 .ne. PEC line dl assuming
const. nW
W46
Mo32
T. Nakano et al., Proceedings of the 41st EPS
conference on plasma physics, 2014
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W and Mo concentrations
Preliminary data
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Conclusion

• JET high resolution X-Ray crystal spectrometer
  upgraded
• W and Mo lines identified
• Many other non-identified lines
• T, ?, n determined for Ni ions
• Preliminary W and Mo concentrations

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Extra slides
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Separation of orders of reflection
Ni26
1st
2nd
Argon escape peak
Pulse height spectra
Diffraction spectra
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W. Position, ?Bragg 51.1º, arm shift 101.6cm
86811, 5keV, 1MW ICRH, 20MW NBI (2.5 sec)
Ni detector
??1.3 pm
??4.3 pm
W detector
1st order
1st order
?
3.1A
5.3A
W46
Mo32
?
?
2nd order
2nd order
2.65A
1.6A
Increases for Ti LBO
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Ni. Position, ?Bragg 52.6º, arm shift 6.1cm
86529, 4keV, 1MW ICRH, 17MW NBI (6 sec)
W detector
??4.3 pm
Ni detector
??1.3 pm
1st order
1st order
3.2A
5.4A
??
??
Ar16?
??
2nd order
2nd order
1.6A
2.7A
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SUPPLIED BY HUGH SUMMERS ON 20.05.88  corrected
on 18.01.89  -------------------------------------
----------------------------  WITH AN ELECTRON
DENSITY OF  0.500E14 CM(-3)  FOR CHARGE STATES
Z1 TO Z25    IONISATION RATES IN FILE
'IONISE'  TOTAL RECOMBINATION RATE IN FILE
'RECOMB'    FOR CHARGE STATES Z23 TO
Z25    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 12.02.88 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...., NI25.... etc, which means  the rates
describe transitions with NI26 etc. as starting
ion
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Resolution 10-4,10-3Å !! Spectral width of
detector 0.01,0.04 Å Total spectral range
0.1,0.4 Å
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Identified lines W46 3p6 3d10 1S0 - 3p5 3d10
4d (3/2, 5/2) 1? 0.52004 nm Mo32 2p 1S0 -
3s 3P1 ? 0.52069 nm (3G) Mo32 2p 1S0 - 3s
3P2 ? 0.5212 nm (M2) W45 3p6 3d10 4s 2S1/2
- 3p5 3d10 4s 4d (3/2, 2) 1/2 ? 0.52289
nm W45 3p6 3d10 4s 2S1/2 - 3p5 3d10 4s 4d
(3/2, 3) 3/2 ? 0.52379 nm Wavelength from
NIST6
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K.B. Fournier, Phys Rev E, 53, 1084, 1996 TFU
E. Kallne, J. Kallne and R.D. Cowan, Phys. Rev. A
27 (1983) 2682 C-MOD
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W. Position, ?Bragg ?51.2º, arm shift ?98.0 cm
86870
W detector
1st order
5.3A
2nd order
2.65A
46.9-47s
Titanium LBO
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Cmo/CW increased0.05 in 2013 gt 0.2-0.3 in 2014
Mo32 (M2)
W46
W45
Mo32
Hybrid pulse W46, W45 and Mo32 seen as in
2013 Typically cW 3e-5, cMo5e-6
gtcMo/cW0.2-0.3 It seems Mo events distribute Mo
sources.
Const. Dl assumed

• Baseline pulses
• W45 and Mo32 (M2) disappeared
• Instead, unidentified lines appeared
• (shown by arrows)
• Suggests Another metal impurities???
• Typically cW 2e-6, cMo6e-7gtcMo/cW0.2-0.3

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W. Position, ?Bragg ?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
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Vignetting
Not to scale
Line averaged data