Characterization of a linear device developed for research on advanced plasma imaging and dynamics
- National Fusion Research Institute, Gwahangno 113, Daejeon 305-333 (Korea, Republic of)
- Korea Basic Science Institute, 804-1 Ochang, Cheongwon 363-883 (Korea, Republic of)
Within the scope of long term research on imaging diagnostics for steady-state plasmas and understanding of edge plasma physics through diagnostics with conventional spectroscopic methods, we have constructed a linear electron cyclotron resonance (ECR) plasma device named Research on Advanced Plasma Imaging and Dynamics (RAPID). It has a variety of axial magnetic field profiles provided by eight water-cooled magnetic coils and two dc power supplies. The positions of the magnetic coils are freely adjustable along the axial direction and the power supplies can be operated with many combinations of electrical wiring to the coils. Here, a 6 kW 2.45 GHz magnetron is used to produce steady-state hydrogen, helium, and argon plasmas with central magnetic fields of 875 and/or 437.5 G (second harmonic). In order to achieve the highest possible plasma performance within the limited input parameters, wall conditioning experiments were carried out. Chamber bake-out was achieved with heating coils that were wound covering the vessel, and long-pulse electron cyclotron heating discharge cleaning was also followed after 4 days of bake-out. A uniform bake-out temperature (150 deg. C) was achieved by wrapping the vessel in high temperature thermal insulation textile and by controlling the heating coil current using a digital control system. The partial pressure changes were observed using a residual gas analyzer, and a total system pressure of 5x10{sup -8} Torr was finally reached. Diagnostic systems including a millimeter-wave interferometer, a high resolution survey spectrometer, a Langmuir probe, and an ultrasoft x-ray detector were used to provide the evidence that the plasma performance was improved as we desired. In this work, we present characterization of the RAPID device for various system conditions and configurations.
- OSTI ID:
- 22055838
- Journal Information:
- Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ARGON
CONTAINERS
CONTROL SYSTEMS
ECR HEATING
ELECTRON CYCLOTRON-RESONANCE
GHZ RANGE
HELIUM
HYDROGEN
INTERFEROMETERS
LANGMUIR PROBE
MAGNET COILS
MAGNETIC FIELDS
MAGNETRONS
PARTIAL PRESSURE
PLASMA
POWER SUPPLIES
RESOLUTION
SPECTROMETERS
STEADY-STATE CONDITIONS
THERMAL INSULATION
X-RAY DETECTION