progress of magnetic reconnection experiment in linear magnetized plasma device xie, jinlin &...
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Progress of Magnetic Reconnection experiment in Linear Magnetized Plasma Device
Xie, JinLin & LMPD groupCAS KEY LABORATORY OF BASIC PLASMA PHYSICS
UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINASuzhou, September 24, 2007
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Outline• Introduction
– What & Why & How– LMPD in USTC
• What we have done by now– Background plasma– Topology of the magnetic field for MR– Diagnostics / Data Acquisition System / …
• Preliminary result• Future plan
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Introduction: Linear Magnetized Plasma Device in USTC
DC, RF & Helicon discharge source;
Bmax: 1000GuassTe:1~10evTi:0.03~0.5evDenisty:108~1013cm-3
Experimental chamber
LIFquad-probe
emissive probelangmuir probe
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Nagoya antenna
13.56MHz,2KWMatch network
Radius
Plasma source: Helicon discharge
RF Power
Plas
ma
Den
sity
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Typical ParametersTypical ParametersLCD
UCLA Pre-update LMPD LMPD
Machine typical Length[cm] 30 10 10
Plasma Denisty[m-3] 1018 1014 ~1016 1014 ~1019
Electron temperature Te[ev] 10 ~4 1~10
Ion temperature Ti[ev] 2 0.03 0.03~0.5
B for Magnetic Reconnection[T]
0.002 0.01 0.01
Ion mass Mi/Mp 40 40 1~40
Ion sound gyro-radius Rci[cm] 60 13 2~18
Ion skin depth [cm] c/wpi 60 4500 7 ~ 14300
Electron skin depth [cm] c/wpe 0.5 17 0.2 ~ 53
Electron free path [cm] 100 ~40 >100 ~ 3
Resistive time [ms] 1.5 0.2 ~ 0.1
Alfven time[us] 25 <1 0.1 ~ 10
Lundquist number ~60 300 10 ~ 1000
Background plasma for MR experiment
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coil Vertical window
Pump
Hor. Window Experimental chamber
Plasma Source
Simulation result via OPERA
Magnetic field for reconnection
7 s 5 s
2500A
time
Curr
ent
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Copper plate and Pulse current source
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Diagnostics for MR • Characteristic for MR experiment in lab plasma
– High spatial resolution: small size Vs large enough S/N– Wide signal bandwidth: Low freq. ~ MHz or microwave High Spatio-temporal resolution
• What we have now:– 3D B dot probe B0 , B1 Current sheet, E…– Retarding grid energy analyzer EVDF & IVDF & flux– Electrostatic probes: Langmuir probe, emissive probe, Mach
probe… Ne, Te, Vf, Vp, Iion, Ie, Ion flux… – Laser induced fluorescence(LIF) IVDF & ion flux – Microwave antenna and related instrument EM radiation
– DAQ system: 12 channels x 5M; 128 x 2M; 2 x 60M
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Vacuum chamber
precision platform for 2D scanning probe
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Ion Saturation Current Electron Temperature
1 2 3 4 5 6 7 8 91
2
3
4
5
6
7
8
9
10
11
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
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Reconstruction of the magnetic field linein order to verify MR process
x
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Vacuum evolution
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Research plan
• Verification of MR process in LMPD
• Heating and acceleration of electron & ion
• Electrostatic & electromagnetic turbulence
• ……….
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Thank you!