Phase contrast imaging interferometer for edge density fluctuation measurements on LHD
A phase contrast interferometer employing a CO2 laser (wavelength i = 10.6 µm) is designed and installed in order to study density fluctuations on a large helical device. A 250×50 mm slab ...
A phase contrast interferometer employing a CO2 laser (wavelength i = 10.6 µm) is designed and installed in order to study density fluctuations on a large helical device. A 250×50 mm slab ...
Collective Thomson scattering based on CO2 laser for ion energy spectrum measurements in JT-60U
A collective Thomson scattering (CTS) diagnostic system based on a pulsed CO2 laser has been developed and brought into operation to establish a measurement technique for ion temperature and the energ...
A collective Thomson scattering (CTS) diagnostic system based on a pulsed CO2 laser has been developed and brought into operation to establish a measurement technique for ion temperature and the energ...
CO2 laser imaging interferometer for high spatial resolution electron density profile measurements on LHD
Rev. Sci. Instrum. 74, 1638 (2003); doi:10.1063/1.1532759
Issue Date: March 2003
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A CO2 laser (
= 10.6 µm) imaging interferometer was developed for detailed and precise electron density profile measurements and was installed on the large helical device in 2001. A CO2 laser is adopted to avoid fringe loss due to the short wavelength. An imaging scheme is employed that uses three slab-like beams and multichannel detector arrays to measure with fine spatial resolution. As an initial trial we used one slab-like beam that passes through the plasma edge. Phase distributions were measured without fringe loss even after pellet injection. Density profiles can be obtained by the slice and stack method with a spatial resolution of 16 mm (about 3% of the plasma minor radius). The electron density was found to rise to about 6×1019 m–3 just after pellet injection even near the last closed flux surface. Mechanical vibration effects would be negligible in such a case. A bench top experiment of a coaxial YAG laser (= 1.06 µm) interferometer for vibration compensation was carried out. ©2003 American Institute of Physics.
= 10.6 µm) imaging interferometer was developed for detailed and precise electron density profile measurements and was installed on the large helical device in 2001. A CO2 laser is adopted to avoid fringe loss due to the short wavelength. An imaging scheme is employed that uses three slab-like beams and multichannel detector arrays to measure with fine spatial resolution. As an initial trial we used one slab-like beam that passes through the plasma edge. Phase distributions were measured without fringe loss even after pellet injection. Density profiles can be obtained by the slice and stack method with a spatial resolution of 16 mm (about 3% of the plasma minor radius). The electron density was found to rise to about 6×1019 m–3 just after pellet injection even near the last closed flux surface. Mechanical vibration effects would be negligible in such a case. A bench top experiment of a coaxial YAG laser (= 1.06 µm) interferometer for vibration compensation was carried out. ©2003 American Institute of Physics.
| History: | Presented 8 July 2002 |
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KEYWORDS and PACS
plasma toroidal confinement,
plasma diagnostics,
plasma density,
fusion reactor instrumentation,
carbon compounds,
gas lasers,
light interferometers
- 52.70.Kz
Optical (ultraviolet, visible, infrared) plasma diagnostic measurements - 52.55.Hc
Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices - 28.52.Lf
Fusion reactor components and instrumentation - 07.60.Ly
Optical interferometers - 42.55.Lt
Gas lasers including excimer and metal-vapor lasers - YEAR: 2003
RELATED DATABASES
PUBLICATION DATA
0034-6748 (print)
1089-7623 (online)
AIP
REFERENCES (11)
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