12/03/2013, Praga 1 Plasma MHD Activity Observations via Magnetics Diagnostics: Magnetic island Analysis Magnetic island Analysis Frederik Ostyn (UGent)

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Presentation transcript:

12/03/2013, Praga 1 Plasma MHD Activity Observations via Magnetics Diagnostics: Magnetic island Analysis Magnetic island Analysis Frederik Ostyn (UGent) Daniel Hernández (CICATA-IPN) Mauricio Rodríguez (US) GOMTRAIC 2013

12/03/2013, Praga 2 1.INTRODUCTION 2.SAFETY FACTOR 3.MAGNETIC ISLANDS 4.DETECTION METHOD 5.FLUCTUATION OF RAW DATA 6.SPECTROGRAM 7.SUMMARY Overview

12/03/2013, Praga 3 Gas confined by magnetics fields Tokamak (GOLEM) Major Radius: 0.4 m Minor Radius: 0.1 m Major Radius: 0.4 m Minor Radius: 0.1 m Toroidal Magnetic Field < 0.8 T Toroidal Magnetic Field < 0.8 T Plasma Current: < 8 kA Plasma Current: < 8 kA Discharge Duration: 13 ms Discharge Duration: 13 ms Background Pressure of Vacuum: mPa Background Pressure of Vacuum: mPa Work Gas: H 2 Work Gas: H 2 Low density and long connement time Low density and long connement time. Fusion in Earth gas Introduction Plasma in equilibrium*: Ψ = const p = const T = const j plasma =const * circular cross-section and zero Shafranov shift Helical Shape

12/03/2013, Praga 4 Safety factor “How many toroidal rotations are neccesary for a single rotation of a magnetic field line in the poloidal direction (2  )” Depends on the geometry of the machine Major Radius: R=0.4 m Minor Radius: r=0.1 m At the plasma Edge (r=a)

12/03/2013, Praga 5 Control Room system

12/03/2013, Praga 6 Safety factor: Experimental Stability of plasma requires the safety factor at the edge (r=a): 2 < q min (a) < 3 Shot # [-] U B [V] U CD [-] T CD [ms] PH2[mPa]Preion[-] >16.92 (12) >11.80 (12) >10.02 (10) >9.96 (10) >11.40 (12) >11.53 (10) >9.89 (10) >10.00 (10) 1 Time(s)

12/03/2013, Praga 7 A magnetic island is a closed magnetic flux tube, bounded by a separatrix, isolating it from the rest of space The rupture of the assumed initial topology of toroidally nested flux surfaces needed to produce the island which requires the reconnection of magnetic field lines in plasma. Magnetics Islands (I)

12/03/2013, Praga If a magnetic island appears, heat and particles transport is enhanced due to shorted field lines, and as a result there is a deterioration of pressure, temperature and plasma current profile. Magnetics Islands (II) Irrational: Any fluctuation can spread quickly and homogeneously Small rational numbers: due to geometrical properties and periodic boundary conditions a plasma wave can live for long time (MHD mode).

12/03/2013, Praga Magnetics Islands (III) q = m/n=3 q = m/n=2 q = m/n=1 M = 3 mode is closer to the edge and detector. So the signal would be stronger.

12/03/2013, Praga Detection of magnetic island Magnetic islands are rotating with the plasma in the toroidal direction Magnetic islands are rotating with the plasma in the toroidal direction Islands deteriorates p, T and j Islands deteriorates p, T and j On GOLEM, p and T measurements are not optimized but can measure j On GOLEM, p and T measurements are not optimized but can measure j Measurement of time evolution of poloidal magnetic field Measurement of time evolution of poloidal magnetic field Set of sensors of local magnetic field (for GOLEM 16) Set of sensors of local magnetic field (for GOLEM 16)

12/03/2013, Praga B θ measurement coils Coil # [-] Polarity [-] A eff [cm^2] xx 13xx 14xx Signal is measured on distribution of local magnetic field sensors

12/03/2013, Praga Number of oscillation maxima for one period time given time of the mode is equal to m mode number Fluctuation of Raw Data (I) m=2 T T Window of signal from all the sensors Window of signal from all the sensors

12/03/2013, Praga 13 # # # # Fluctuation of Raw Data (II) Oscilations are best visible when island is on radius close to plasma edge

12/03/2013, Praga 14 Shot # [-] Island Index Time_d[ms]Time_u[ms]m[-]Comments ,62 Good Signal ,815,02Nice ,024,22Nice ,8263 Not Very Nice ,325, , , ,219, ,721,91 Fluctuation of Raw Data (III)

12/03/2013, Praga Spectrogram 15 To know the time of MHD mode appears Look for high peaks in spectrogram (dark red) The time window where the peaks appear is where to look (black circles) # 11704, coil 4

12/03/2013, Praga 16 Summary In a Tokamak the magnetic configuration produces a field in toroidal and poloidal axis, in GOLEM Tokamak this can be controlled remotelyIn a Tokamak the magnetic configuration produces a field in toroidal and poloidal axis, in GOLEM Tokamak this can be controlled remotely The safety factor in Tokamak GOLEM is determined byThe safety factor in Tokamak GOLEM is determined by Low values for safety factor are ideal to observe magnetic islandLow values for safety factor are ideal to observe magnetic island In Tokamak GOLEM MHD studies is by 16 Mirnov coils mounted in a poloidal ringIn Tokamak GOLEM MHD studies is by 16 Mirnov coils mounted in a poloidal ring Number of oscillation maxima for one period time given time of the mode is equal to m mode numberNumber of oscillation maxima for one period time given time of the mode is equal to m mode number Mode number 2 was observed a lot of timesMode number 2 was observed a lot of times The spectrograms show the magnitude of the signal in frequency state for each coil of poloidal arrangementThe spectrograms show the magnitude of the signal in frequency state for each coil of poloidal arrangement Future work is to process the signal with statistical methods (cross correlation, to get a better analysis)Future work is to process the signal with statistical methods (cross correlation, to get a better analysis)

12/03/2013, Praga Thank you for your attention Contact: Contact: Contact: