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Experimental Studies of the Hall Effect in MRX. Y. Ren, S. Gerhardt , A. Kuritsyn, H. Ji, R. Kulsrud, M. Yamada Princeton Plasma Physics Laboratory. Outline. The Hall effect in numerical simulation and space observations.

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experimental studies of the hall effect in mrx

Experimental Studies of the Hall Effect in MRX

Y. Ren, S. Gerhardt , A. Kuritsyn, H. Ji, R. Kulsrud, M. Yamada

Princeton Plasma Physics Laboratory

outline
Outline
  • The Hall effect in numerical simulation and space observations.
  • Experimental study of the Hall effects during magnetic reconnection in the MRX.
  • Summary
two models to fast magnetic reconnection
Two Models to Fast Magnetic Reconnection

Two-fluid MHD model in which electrons and ions decouple within the scale of order c/pi and the reconnection rate is enhanced by the dispersive nature of the whistler wave.

Generalized Sweet-Parker model with anomalous resistivity.

the hall effects during reconnection shown in 2d simulations
The Hall Effects During Reconnection Shown in 2D Simulations

P. L. Pritchett, JGR 2001

The out-of-plane magnetic field is generated during reconnection.

Different motions of ions and electrons show the decoupling of them, thus generating the in-plane Hall current and the out-of-plane magnetic field.

space observation showing signs of the hall effects
Space observation showing signs of the Hall effects

F.S. Mozer et al., P.R.L. 2002

The out-of-plane magnetic field.

comparison with numerical simulation i
Comparison with numerical simulation (I)

4.8 c/pi

0.9 c/pi

Pritchett, JGR , 2001

fine structure probe array
Fine structure probe array
  • A magnetic probe array with spatial resolution up to 1.25 mm and 71 channels is used to search for the signs of the Hall effects.

Fine structure probe

the construction of the fine structure probe i
The Construction of the Fine Structure Probe (I)

D. Cylinder

The coils are hand-winded with 48 AWG magnet wire to 160 turns and approximately 1mm in diameter and 2 mm in length.

The small coils are glued to an alumina rod.

the construction of the fine structure probe ii
The Construction of the Fine Structure Probe (II)

Fine structure probe

Aluminized mylar is used to provide electrostatic shielding. The 3dB point of the frequency response is about 1MHz.

the probe location
The probe location
  • The fine structure probe is inserted in the radial direction in the MRX at two locations, Z=7cm and Z=-7cm, are extensively studied.

71-channel magnetic probe array

comparison with numerical simulation ii
Comparison with numerical simulation (II)

Pritchett, JGR , 2001

71-channel probe location

Electron

(1)

VZe/VA» 0.7

(underestimate VZe)

1.8 c/pi

(2) Ve/VA» 1.2 in numerical simulation

Ion

quadrupole field in argon plasma
Quadrupole field in Argon Plasma

Fill pressure 2.1 mTor.

~0.3, ~9

~14 cm, assuming Z=1

summary
Summary
  • The Hall effects are observed during magnetic reconnection in MRX. Good agreement is found between experiment and simulation.
  • The future goal is to study the relation between the Hall effect and fluctuations and to study the quadrupole field with fine magnetic probe array.