1 10 th meeting of the itpa topical group on diagnostics, moscow, russia magnetic sensor laboratory,...

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10th Meeting of the ITPA Topical Group on Diagnostics, Moscow, Russia

Magnetic Sensor Laboratory, Lviv Polytechnic National University, Ukraine. http://www.MSL.Lviv.ua

First Experiments with Galvanomagnetic Instrumentation on the Tore Supra

and the JET Fusion Facilities

I.Bolshakova1, V.Coccorese2, I.Duran3, S.Gerasimov4, R.Holyaka1, P.Moreau5, A. Murari6, F. Saint-Laurent5, J. Stockel3

1. Magnetic Sensor Laboratory (LPNU); 1 Kotliarevsky Str, Lviv, 79013, UKRAINE2. .Association EURATOM-ENEA(CREATE), Via Claudio 21, I-80125 Napoli, ITALY3. IPP Prague, Association EURATOM/IPP.CR, Za Slovankou 3, 182 00 Praha 8, CZECH REPUBLIC4. Euratom/UKAEA Association, Fusion Culham Science Centre, Abingdon, OX14 3EA, UK5. Association EURATOM-CEA, Cadarache, 13108 Saint Paul Lez Durance, FRANCE 6.Consorzio RFX, Associazione ENEA-EURATOM per la Fusione, Corso Stati Uniti 4, 37125 Padova, ITALY

http://www.msl.lviv.ua/


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Contents

Abbreviated notations:

GI – Galvanomagnetic InstrumentationHT – Hall TransducerIMT – Integrated Magnetic Transducer

1. Statement of the problem 2. Galvanomagnetic Instrumentation: requirements & solutions3. Integrated Magnetic Transducer & Intelligent Functions4. Experiments with GI on TORE SUPRA, Cadarache (France)5. Experiments with GI on JET, Culham (UK)6. GI electronics & parameters7. New High Frequency Magnetic Transducer8. Next steps9. Conclusion and acknowledgments



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Statement of the problem

Two main requirements for magnetic field measurements in fusion reactors of next generation:

first – the necessity to perform accurate magnetic field measurements at steady state (quasi-stationary mode) with the duration up to 3600 s;

second – operation reliability at a considerable level of penetrating radiation.

These requirements make it difficult to use only the traditional inductive methods based on pick-up coils and integrators.

To solve this problem the galvanomagnetic transducers, namely transducers based on the Hall effect, can supplement the existing magnetic field system based on the traditional inductive coils, since they do not have any particular restriction with regard to quasi-stationary and steady-state magnetic field measurements.



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Galvanomagnetic Instrumentation: Requirements & Solutions

1. Special Hall Transducers for extreme operation conditions

2. In-situ calibration

3. Wide-band magnetic field measurement

4. Multi-channel measurement

5. High precision of measurement under considerable noise conditions

6. Signal transfer over long distances



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1 – Hall Sensor2 – Coil 3 – Substrate4 – Pins

Integrated Magnetic Transducer & Intelligent Functions

1. Magnetic field measurement in high rate mode (real time mode).2. Magnetic field measurement in high precision mode (correction mode).3. Selftesting by formation & measurement of test magnetic field.4. Transducing function correction.5. Temperature measurement.6. Combination of galvanomagnetic and electromagnetic measurements in

united system.

2

3

4

1x

d

D

x = 0

B




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BB

U (B)

B e B x

o

U (B)o

U (B)e

Magneticinduction, B

U (B )Ho

U = f(B)Ho

U = f(B)He

x

U (B )=He xU (B )Ho e

correction error

true (measuring)

n

0j

jjHo BaV

n

1j

1jj

HoHe BajGdB

)VG(ddB

dV

n

0j

jj

xen

1j

1jjxHe Ba

B)B(V

Baj)B(V

Transducing function:

aj - coefficients of the polynomial series

VHe = GVHo , G - drift factor

Transducing function correction



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3D Integrated Magnetic Transducer



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MSL Galvanomagnetic Instrumentation



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HA

SD

SI

CS1

CN

ST OP

MXCS2

PC

IMTElectronics

PS

TL1

HC

LALC

TL2

MX – MultiplexerCN – Control moduleCS1, 2 – Current source 1, 2SD – SynchrodetectorHA – High frequency amplifierHC – High frequency ADCLA – Low frequency amplifierLC – Low frequency ADCST –StabilizerSI – Serial interfaceOP – Optical isolatorPS – Power supply unitIMT – Integrated Magnetic TransducerTL1, 2 – Transmission line 1, 2

MSL GI Electronics



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Experiments with GI on TORE SUPRA,Cadarache (France)


3D IMT location –

on the surface of poloidal field coil just outside the TS vessel together with the reference 3D coil system



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The results of magnetic field measurement on TORE SUPRA (low frequency mode)



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The results of magnetic field measurement on TORE SUPRA (selfdiagnostic)



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see next slide



The results of magnetic field measurement on TORE SUPRA (HF mode, pulse #34085)



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scale is enlarged




15






16




scale is enlarged



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The same pulse (#34073) getting by coil techniques



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… and temperature measurements (only for resolution representing)



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Experiments with GI on JET, Culham (UK)

3D IMT location



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MSL GI on JET



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The results of magnetic field measurement on JET



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In-vessel measurements using MSL 3D Hall probe



CASTOR collaboration



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GI Electronics and Software in details … if it is possible from the time point of view



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8-channels signal conversion for 3D IMT

8x1

8x1

V ref

IHG

IHG

A k1k2

HG X

HG Y

HG Z

Coi

l XC

oil Y

Coi

l ZICX

ICY

ICZ

V CX

V CY

V CZ

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5

Input, V

Output, V

Kv=10 @ Vinp < 150 mV

HF Signal compression

Kv=1 @ Vinp > 150 mV



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ADuC 824 MicroConverter™, 24-Bit ADC with FLASH MCU

GI: Signal Processing Components

AD855X,Zero drift OA

AD7663,16-Bit, 250kSPS ADC

Intelligent Sensors (IEEE 1451.2-Compatible)



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Comparison of Galvanomagnetic and Coil methods

• field change rate – up to 1 T/sec;•duration of flat pulse – 0.20.5 sec;• sampling frequency – 1 kHz (t = 1 msec);• measurement duration – 5 sec.

The parameters:



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Comparison of Galvanomagnetic and Coil methods



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GI Software

Selfdiagnostic

Two channels

HF measurement



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116.12

116.13

116.14

116.15

116.16

116.17

116.18

0 20 40 60 80 100time, sec

V, mV

+/- 0.01%

25.155

25.165

25.175

25.185

25.195

25.205

0 5 10 15time, sec

V, mv

B=0.002T

+/-0.02%

24.0

24.2

24.4

24.6

24.8

25.0

25.2

25.4

0 20 40 60 80time, sec

V, mv

B=0.1TB=0

B=0.3T

B=1T

B=0.002T

GI main parameters: precision

Selfdiagnostic

High precisionmode of magnetic

field measurement



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Transmission driver for GI on TORE SUPRA



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Transmission driver for GI on JET

MSLGalvanomagnetic Instrumentation



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I

1 2

3

456

7

8

A

II

III

A

A-AIV

Bolshakova І., Holyaka R. Magnetic field measuring transducer. Patent of Ukraine #72825 of 15.04.2005

New High Frequency Magnetic Transducer

I - traditional HT

II - highly sensitive HT

III - the loop for the electromagnetic compensation



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Measuring magnetic field frequency band up to 1 MHz

Measurement accuracy (measuring method):

• in the frequency range 01 kHz (direct measurement with Hall transducer of FM-sensor)

0.1 %

• in the frequency range 1 kHz 1 MHz (measuring with Hall transducer, interference compensation by MF-sensor electromagnetic loop)

1 %

OSCILLOSCOPE

HFA

BENCHMF-

sensorsolenoid

P R O B E

...

RVS CB SWL C

B

The bench for high frequency magnetic field formation



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The dumping oscillation current of test coil& signal of galvanomagnetic sensor

VHT (I = 20 mA)

Current of test coil Current of test coil

Current of test coilCurrent of test coil

VHT (I = -20 mA)

VHT (I = 0 mA)

VHT (I = 0 mA)



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NEXT STEPS

Collaboration with European tokamaks:

• JET 2006-2007

• TORE SUPRA 2006-2008

• TEXTOR 2006-2007

• CASTOR 2006

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JET

Tore Supra



Qualification and validation of Hall Probe System

for potential applications in ITER

TEXTOR

CASTOR

High frequency MHD analysis (in-vessel): special techniques for

electromagnetic noise elimination and high-temperature robust Hall sensor

Perturbation field measurement (fast-reciprocating probe): integrated transducer based on Hall sensor and pick-up coil

Residual magnetic field measurements (ex-vessel): special

techniques for self-diagnostics and off-set drift reduction

Short magnetic pulse measurements (in-vessel)

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• The problem of quasi-stationary magnetic field measurements in fusion devices can be efficiently solved by using Hall-type galvanomagnetic transducers.

• Contrary to the traditional measuring coils, the HT can measure the steady-state and the alternating magnetic fields with sufficiently high accuracy.

• Proposed principles of instrumentation construction for quasi-stationary magnetic field measurements, based on the developed radiation hard HTs and original signal processing electronics, meet the requirements of extreme operation conditions on fusion reactors of new generation.

• The galvanomagnetic transducers and the based-on instrumentation being presented in the work, were used during the experiments with quasi steady-state magnetic fields on the tokamaks TORE SUPRA (France) and JET (UK).

Conclusion



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Acknowledgments

The work was supported by:

• STCU (Ukraine)• EFDA-JET (UK)• Association EURATOM-CEA (France)• Association EURATOM-ENEA/CREATE (Italy).

…. thank you



1 10 th meeting of the itpa topical group on diagnostics, moscow, russia magnetic sensor laboratory,...

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