Development of 3.3 kJ Small Plasma Focus for Medical Radioisotopes Production: Preliminary resultsPlasma Sheath Velocity and Pinch Phenomenal Measurements in TPF-II Plasma Focus Device
Arlee Tamman
PE wave : Center of Excellence in Plasma Science and Electromagnetic Wave
Walailak University, THAILAND
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Plasma Research in Walailak University
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Low Pressure Plasma Atmospheric Pressure Plasma
8 cm
1.5 cm
Prof. Thawatchai Onjun
Plasma Focus Device
- TPF-I : Thammasat University Prof. Nopporn Poolyarat
- TPF-II : Walailak University Prof. Mudtrolep Nisoa
3
Phuket
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
TPF : Thailand Plasma Focus
• Experiment Setup • System Inductance Designing • Short circuit test • Plasma Parameter Estimation • Measurement System
• Result
• Conclusion
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23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Introduction to Plasma Focus device
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= 1024 − 1026 −3
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
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Capacitor
B
The pinch phase must occur at the equal time with the maximum current.
Introduction to Plasma Focus device 23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup: System Inductance
Designing Inductance • Static inductance (79 nH)
• Capacitor : 40 nH (Fix) • Current Collector : 19 nH • Spark Gap (TDI3-200k) : 20 nH (from NX3: TDI1-150K)
• Varying inductance (368 nH) • 1 m of Coaxial Cable : 252 nH/line • Connector : 116 nH/line (8 line of Coaxial -> 368/8 = 46 nH)
Capacitor: 40 nH Coaxial (RG218): 252 nH/m
Current Collector : 19 nH TDI3-200k: 20 nH
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
- Current Collector Design (Target : 20 nH)
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
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- Short Circuit test Operating parameter • Voltage: 3 kV • Coaxial Lines: 2, 4, 8
I Short Circuit Plate
L
R
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Short Circuit Test
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Number of Connector: 2 Number of Connector: 4 Number of Connector: 8
19.9 ± 0.3 nH 15.8 ± 0.2 nH 13.48 ± 0.08 nH
L0 = 330 ± 10 nH L0 = 211 ± 5 nH L0 = 153 ± 2 nH
10 Loop of Rogowski Coil
Experimental Setup 23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
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System Inductance (n=8) - Design : 125 nH
- Device : 153 nH
L0 = 93 + 476/n
Short Circuit Test
Experimental Setup 23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
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Plasma Parameter Estimation
Pressure : 1.2 Torr Imax=110 kA
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
= 80 kA/(cm torr1/2).
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
Glass Viewer Fiber Optic
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
Dental X-ray film (30×40 mm)
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Experimental Setup
Results: Pinch Percentages
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
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Charging Voltage : 10 kV
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Results: Sheath Velocity
50 Shot 30 Shot
20 Shot 10 Shot
Results: X-Ray
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
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#964-NF
Results: Optical Emission Spectroscopy
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
A r-
8
Conclusion • The pinch phase is confirmed by the current waveform and X-ray photography.
• Estimate parameters of the TPF-II are 110 kA of maximum current, 15.46 ns of pinch duration and 200 eV of the pinch temperature.
• Light emission of the pinch phase show the line of Ar-I, Ar-II, Cu-I, Cu-II and Cu-III
Future Work • PIN Diodes for X-Ray Diagnostics.
• Faraday Cup for Ion Beam Diagnostics.
• Application of Ion Beam for Gemstone Modification.
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
Acknowledges
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in Science Project (Science Achievement Scholarship of Thailand, SAST)
- Government Annual Research Budget through Thammasat University.
- High Voltage Power Supply was Supported by Chulalongkorn University and Chang Mail University
23rd IAEA Technical Meeting on the Research Using Small Fusion Devices
INTERNATIONAL CONFERENCE ON PLASMA SCIENCE AND APPLICATIONS
ICPSA 2017
Ar II 531.611 1213.72
Ar I 588.2624 1079.72
Ar II 620.646 1204.72
Ar II 655.772 3998.72
Ar II 705.4993 1584.47
Ar I 737.2118 2176.47
Ar I 750.3869 2395.47
Ar I 762.8882 2681.97
Ar II 792.735 2508.22
Ar I 800.6157 1839.47
Ar I 810.3693 3368.72
Ar II 825.9521 1125.22
Ar I 840.8210 1573.97
Ar II 971.377 1552.72
Cu I 576.975 3013.47
Cu III 610.087 895.47
Cu II 662.4292 2107.72
Cu II 786.058 1592.97
Cu I 925.680 689.97
Cu I 921.375 584.97
Cu I 953.03 927.72
A r-
II 1
0 4
4 .0
Experimental Setup : Rogowski Coil and Magnetic Probe
Current Probe
Current Probe
HV Probe
Magnetic Probe V.4
3/2558 1/2559
X-Ray Current
Magnetic Probe V.4
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- Plasma focus phase : Axial Acceleration Phase
REF: Bernard, A., et all. (1998). Scientific status of plasma focus research. J. Moscow. Phys. Soc., 8, 93–170.
Optimized gas pressure
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