Two dimensional density and its fluctuation measurements by using phase imaging method in GAMMA 10.

Two dimensional (2D) plasma image analysis is useful to study the improvement of plasma confinement in magnetically confined fusion plasmas. We have constructed a 2D interferometer system with phase imaging method for studying 2D plasma density distribution and its fluctuation measurement in the tandem mirror GAMMA 10. 2D profiles of electron density and its fluctuation have been successfully obtained by using this 2D phase imaging system. We show that 2D plasma density and fluctuation profiles clearly depends on the axial confining potential formation with application of plug electron cyclotron heating in GAMMA 10.

[1]  Alexei Beklemishev,et al.  Influence of Radial Electric Field on High-Beta Plasma Confinement in the Gas Dynamic Trap , 2007 .

[2]  A. Mase,et al.  Measurements of 2-Dimensional Plasma Density Distributions by the Phase-Imaging Method in GAMMA 10 , 2007 .

[3]  Y. Nakashima,et al.  Observation of the Effects of Radially Sheared Electric Fields by the Use of a Gold Neutral Beam Probe , 2007 .

[4]  Y. Tatematsu,et al.  Electron Density Measurement by Using a Multi-Channel Interferometer System in the Tandem Mirror GAMMA 10 , 2007 .

[5]  Y. Tatematsu,et al.  Electron density fluctuation measurements using a multichannel microwave interferometer in GAMMA 10 , 2006 .

[6]  N. Oyama,et al.  Millimeter-wave two-dimensional imaging optical system for interferometer of the GAMMA 10 tandem mirror , 2002 .

[7]  T. Tokuzawa,et al.  Initial Measurements from an Ultrashort-Pulse Reflectometer on GAMMA 10 , 1999 .

[8]  T. Tokuzawa,et al.  Preliminary electron density profile and fluctuation measurements on GAMMA 10 using ultrashort-pulse reflectometry , 1999 .

[9]  T. Tokuzawa,et al.  Millimeter-wave two-dimensional imaging array for the GAMMA 10 tandem mirror , 1997 .

[10]  Kazuhiro Uehara,et al.  Millimeter‐wave phase‐imaging interferometer for the GAMMA 10 tandem mirror , 1991 .

[11]  A. Mase,et al.  Control of the radial electric field and of turbulent fluctuations in a tandem mirror plasma , 1991 .

[12]  Ishii,et al.  Ambipolar potential effect on a drift-wave mode in a tandem-mirror plasma. , 1990, Physical review letters.

[13]  A. Mase,et al.  Measurement of dispersion relation of waves in a tandem mirror plasma by the Fraunhofer‐diffraction method , 1990 .

[14]  Dean P. Neikirk,et al.  Multichannel far-infrared phase imaging for fusion plasmas , 1985 .

[15]  C. A. Hugenholtz,et al.  Multichannel CO2‐laser interferometer using a PbSnTe detector array , 1982 .