a. shumack 1/(18) adas workshop 28 sept 2014 high-resolution x-ray diagnostic upgrade for iter-like...

A. Shumack 1/(18) ADAS workshop 28 Sept 2014

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

Amy ShumackAmy ShumackADAS workshop 29/9/14ADAS workshop 29/9/14


Overview

• The X-Ray spectrometer and upgrade

• Identification of W and Mo lines

• Other lines that we can measure

• Determination of plasma parameters


Introduction

ITER

JET

JET ITER-like wall


High resolution X-Ray spectroscopy• core:

• impurity concentration• ion temperature• rotation velocity

#61098

T

n

X-Ray spectroscopy


KX1 – X-Ray crystal spectrometer

Line of sight – 20 cm below average magnetic axis

20m


Johann configuration

Not to scale


Vignetting – ITER-like wall

Not to scale


Vignetting – ITER-like wall

Not to scale

All orders of reflection

collectedsimultaneously


Spectrometer upgrade

0

1.5100 1.5300 1.5500 1.5700 1.5900Wavelength (Å)

Inte

nsity

(ar

b un

its)

~ 3 keV for all shots

0

5.0000 5.1000 5.2000 5.3000Wavelength (Å)

Inte

nsity

(a

rb.

units

)

4.5

4.4

4.54.6

4.7

3.93.8

3.13.0

3.0

2.8 3.8

Wi46+ and

Mo32+ lines

Ni 26+ line

1. New crystals

2. GEM (Gas Electron Multiplier) detectors and DAQ system

)1110(2SiO

)220(Ge

Bragg angle

Te

Te ~

Ni26+

W46+ Mo32+


• GXS project (“Gas Electron Multiplier Detector for X-ray Crystal Spectrometry” )

GEM detectors developed by IPPLM* to replace old MWPC detector

*Institute of Plasma Physics and Laser Micro-fusion, Poland

70 μm

140 μm

GEM foilTriple-GEM detector

(256

GEM detectors

Signal amplification

ADCs77.7 MHz

GEM Detectors

(256 strips)

FPGA Analysis

(events counts)Counts

• Signal processing:


0

5.0000 5.1000 5.2000 5.3000Wavelength (Å)

Inte

nsity

(ar

b. u

nits

)

4.5

4.4

4.54.6

4.7

3.93.8

3.13.0

3.0

2.8 3.8

W46+ M-shell transition

4d-3p

Mo32+ L-shell transitions

3s-2pW44+

M-shell transition

???

Shot nrs: 83735-83753

Line identification

? M2*


Line identification

Mo LBO at 58 s

KX1 – Molybdenum laser blow-off experiment

FAC code calculation*at 5 keV with equal Mo32+,W45+

and W46+ density

(Only) suspected Mo lines became significantly more intense

JPN85232

*T. Nakano et al., Proceedings of the 41st EPS conference on plasma physics, 2014


Other lines

8653548.1-48.3s5keV, 8E19

8659247.6-48.1s7keV, 6E19

8660350.1-50.3s6keV, 6E19

W4

6+

W4

5+

Mo

32+

(

3G

)

Mo

32+

(

M2

) W 2nd order

2.65A

Increases for Ti LBO

5.3A

Ar16+?

W 1st order

Ni 1st order

3.2A


Obtaining plasma parameters - Ni

Ni26+ spectral linesw: 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 linesn>=3.

w

xt

Feature consisting ofdielectronic satellites,

fit with fn depending on Te

Gaussian functionsVoigt function

130 ms integration

time

- Divide by vignetting function

- Least squares fit Ti, ωNi26+, Ni. conc.

y


Plasma parameters - Ni

r/a=0.45-0.55

r/a=0.2-0.4

Te HRTS

Ti KX1

KX1=X-Ray spectrometer


I line = nW∫ FAW46+ .ne. PEC line dl

assuming const. nW

Obtaining plasma parameters – W/Mo analyzer

*T. Nakano et al., Proceedings of the 41st EPS conference on plasma physics, 2014

W and Mo analyzer GUI* εline = nW46+ . ne . PEC line

FA: calculated from ADAS ionization /recombination coefficients assuming coronal equilibrium

PECs: calculated with FAC code

W46+

Mo32+


W and Mo concentrations

W conc.

Mo conc.

Preliminary data


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


Extra slides


Separation of orders of reflection

Diffraction spectraPulse height spectra

Ni+26

1st 2ndArgon escape peak


2nd order

1st order

W. Position, θBragg= 51.1º, arm shift = 101.6cm

2nd order

1st order

86811, 5keV, 1MW ICRH, 20MW NBI (2.5 sec)

W detector

5.3A

2.65A

3.1A

1.6A

Δλ=4.3 pm Δλ=1.3 pmNi detector

Increases for Ti LBO

W46+ Mo32+

?

? ?


Ni. Position, θBragg= 52.6º, arm shift = 6.1cm

2nd order

1st order

86529, 4keV, 1MW ICRH, 17MW NBI (6 sec)Ni detector

3.2A

1.6A

Δλ=4.3 pmΔλ=1.3 pm

2nd order

1st order

W detector

5.4A

2.7A

??

??

??

Ar16+?


SUPPLIED BY HUGH SUMMERS ON 20.05.88 corrected on 18.01.89 ----------------------------------------------------------------- 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 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


Resolution: ~ 10-4,10-3Å !!Spectral width of detector: 0.01,0.04 Å

Total spectral range: ~0.1,0.4 Å


Identified lines:W46+ : 3p6 3d10 1S0 - 3p5 3d10 4d (3/2, 5/2) 1:λ= 0.52004 nm*Mo32+ : 2p 1S0 - 3s 3P1 : λ =0.52069 nm* (3G)Mo32+ : 2p 1S0 - 3s 3P2 : λ=0.5212 nm (M2)W45+ : 3p6 3d10 4s 2S1/2 - 3p5 3d10 4s 4d (3/2, 2) 1/2: λ = 0.52289 nm*W45+ : 3p6 3d10 4s 2S1/2 - 3p5 3d10 4s 4d (3/2, 3) 3/2: λ= 0.52379 nm** Wavelength from NIST[6]


*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


W. Position, θBragg= ?51.2º, arm shift = ?98.0 cm

2nd order

1st order

86870W detector

5.3A

2.65A

Titanium LBO46.9-47s


Cmo/CW increased:0.05 in 2013 => 0.2-0.3 in 2014

W4

6+

W4

5+

Mo3

2+

Mo

32+

(

M2

)

Const. assumed Hybrid pulse: W46+, W45+ and Mo32+ seen as in 2013Typically cW~ 3e-5, cMo~5e-6 =>cMo/cW~0.2-0.3It seems Mo events distribute Mo sources.

Baseline pulses: W45+ and Mo32+ (M2) disappearedInstead, unidentified lines appeared

(shown by arrows)Suggests Another metal impurities???

Typically cW~ 2e-6, cMo~6e-7=>cMo/cW~0.2-0.3


W. Position, θBragg= ?51.2º, arm shift = ?98.0 cm

2nd order

1st order

87229, ?keV, ?MW ICRH

2nd order

1st order

W detector Ni detector

5.3A

2.65A

3.1A

1.6A


Vignetting

Not to scaleLine averaged data

a. shumack 1/(18) adas workshop 28 sept 2014 high-resolution x-ray diagnostic upgrade for iter-like...

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