研究目的
To measure the ion temperature in a linear magnetized helicon plasma using laser-induced fluorescence spectroscopy and to evaluate the effect of Zeeman splitting for a more accurate assessment of the measurement.
研究成果
The developed LIF spectroscopy system successfully measured the ion temperature in PANTA plasma, confirming the assumption of T i /T e ～0.1 used in previous studies. The effect of Zeeman splitting was observed and found to be consistent with calculations, providing valuable information for evaluating nonlinear processes in plasma turbulence.
研究不足
The measurement has a low signal-to-noise ratio due to low plasma density and is affected by Zeeman splitting, which complicates the accurate assessment of ion temperature.
1：Experimental Design and Method Selection:
A laser-induced fluorescence spectroscopy system was developed to measure the ion temperature in a linear magnetized helicon plasma. The system includes a laser tuned to excite argon ions, an electro-optical modulator for amplitude modulation, and a photo multiplier tube for detecting fluorescence light.
2：Sample Selection and Data Sources:
The experiment was performed in a linear device at Kyushu University (PANTA), using argon plasma under specific conditions of neutral gas pressure and magnetic field strength.
3：List of Experimental Equipment and Materials:
The setup includes a laser source, EOM, wavelength meter, signal amplifier, signal generator, plasma chamber, collecting lens, optical fiber, PMT, lock-in amplifier, ADC, and data server.
4：Experimental Procedures and Operational Workflow:
The laser frequency was controlled after the plasma discharge stabilized, and the fluorescence intensity was measured over 800 discharges for averaging.
5：Data Analysis Methods:
The ion velocity distribution functions were analyzed using nonlinear weighted least-squares estimation with the Gauss-Newton algorithm, considering the Maxwell distribution and Zeeman splitting effects.
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wavelength meter
HighFinesse WS-7
HighFinesse
Measure the wavelength of the laser
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collecting lens
SIGMA DG APO MACRO 180 mm
SIGMA
Collect the light at 442.6 nm from the decay of 4p4D5/2 state to the 4s4P3/2 state
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optical fiber
Edmond optics
Edmond optics
Transmit the collected light to the PMT
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PMT
Hamamatsu Photonics H3165-10
Hamamatsu Photonics
Detect the fluorescence light
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laser source
TOPTICA Photonics TA Pro
TOPTICA Photonics
To excite the 3d4F7/2 level to the 4p4D5/2 level in Ar II
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EOM
LINOS Photonics LM0202
LINOS Photonics
Modulate the amplitude of the continuous wave laser
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signal amplifier
QIOPTIQ Photonics LIV 20
QIOPTIQ Photonics
Amplify the signal for EOM
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signal generator
NF Corporation WF1966
NF Corporation
Generate the pulsed binary modulation waveform
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plasma chamber
Made of the stainless steel with a diameter of 0.445 m and an axial length of ～4 m
Contain the plasma
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lock-in amplifier
NF Corporation LI5660
NF Corporation
Amplify the signal from PMT
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ADC
National Instruments NI5751
National Instruments
Convert the analog signal to digital data
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data server
National Instruments NI PXIe-1071
National Instruments
Save the digital data
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