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Progress of Magnetic Reconnection experiment in Linear Magnetized Plasma Device Xie, JinLin & LMPD group CAS KEY LABORATORY OF BASIC PLASMA PHYSICS UNIVERSITY.

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Presentation on theme: "Progress of Magnetic Reconnection experiment in Linear Magnetized Plasma Device Xie, JinLin & LMPD group CAS KEY LABORATORY OF BASIC PLASMA PHYSICS UNIVERSITY."— Presentation transcript:

1 Progress of Magnetic Reconnection experiment in Linear Magnetized Plasma Device Xie, JinLin & LMPD group CAS KEY LABORATORY OF BASIC PLASMA PHYSICS UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA Suzhou, September 24, 2007

2 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

3 Introduction: Linear Magnetized Plasma Device in USTC DC, RF & Helicon discharge source ; B max : 1000Guass Te:1~10ev Ti:0.03~0.5ev Denisty:10 8 ~10 13 cm -3 Experimental chamber LIF quad-probe emissive probe langmuir probe

4 Nagoya antenna 13.56MHz,2KW Match network Radius Plasma source: Helicon discharge RF Power Plasma Density

5 Typical Parameters LCD UCLA Pre-update LMPDLMPD Machine typical Length[cm]3010 Plasma Denisty[m -3 ]10 18 10 14 ~10 16 10 14 ~10 19 Electron temperature Te[ev]10~41~10 Ion temperature Ti[ev]20.030.03~0.5 B for Magnetic Reconnection[T]0.0020.01 Ion mass M i /M p 40 1~40 Ion sound gyro-radius R ci [cm]60132~18 Ion skin depth [cm] c/w pi 6045007 ~ 14300 Electron skin depth [cm] c/w pe 0.5170.2 ~ 53 Electron free path [cm]100~40>100 ~ 3 Resistive time [ms] 1.50.2~ 0.1 Alfven time[us] 25<10.1 ~ 10 Lundquist number ~60 300 10 ~ 1000 Background plasma for MR experiment

6 Simulation result via OPERA Magnetic field for reconnection time Current

7 Copper plate and Pulse current source

8 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  B 0, B 1  Current sheet, E… – Retarding grid energy analyzer  EVDF & IVDF & flux – Electrostatic probes: Langmuir probe, emissive probe, Mach probe…  N e, T e, V f, V p, I ion, I e, 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

9 GDB

10

11 Vacuum chamber precision platform for 2D scanning probe

12 Ion Saturation CurrentElectron Temperature

13 Reconstruction of the magnetic field line in order to verify MR process

14

15 Vacuum evolution

16 Research plan Verification of MR process in LMPD Heating and acceleration of electron & ion Electrostatic & electromagnetic turbulence ……….

17 Thank you!


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