Antenna decoupling requirements in a gyrotron collective Thomson scattering diagnostic (CTS)a)
The required rejection ratio of the stray light in a CTS, respect to the launching power is investigated, for obtaining useful signal-to-noise ratio. This problem is faced considering the central gyro...
The required rejection ratio of the stray light in a CTS, respect to the launching power is investigated, for obtaining useful signal-to-noise ratio. This problem is faced considering the central gyro...
Thomson scattering system on FTU tokamak: Calibration, operation, resultsa)
The Frascati tokamak upgrade (FTU) Thomson scattering system is employed for the measurement of the electron temperature and density spatial profiles along the vertical torus diameter in 19 spatial po...
The Frascati tokamak upgrade (FTU) Thomson scattering system is employed for the measurement of the electron temperature and density spatial profiles along the vertical torus diameter in 19 spatial po...
Magnetic field mapping system on the H-1 heliaca)
Rev. Sci. Instrum. 66, 1163 (1995); doi:10.1063/1.1145998
Issue Date: February 1995
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The H-1 heliac recently brought into operation is a medium-sized 3-field-period heliac with major radius R0=1 m, plasma mean minor radius 
a
0.2 m and a wide range of rotational transforms 0.6
–(0)2.0. Electron beam mapping of the vacuum magnetic field was performed using new type of a fluorescent target (movable fluorescent rod array having a transparency about 98%). Up to 150–200 toroidal transits were observed at each electron gun position. The spatial resolution of the system was about 3 mm. Electron collector probes were used for monitoring the positions of the magnetic surfaces in different toroidal field periods. Visible paths of the electron beam due to the excitation of the background gas (p~10−4 Torr) were used for identification of the toroidal transit numbers. This newly developed method gives an accuracy in measurement of the rotational transform of about 1.5%. Experimental surfaces and measured 
profiles show very good agreement with the computer model results. ©1995 American Institute of Physics.
a0.2 m and a wide range of rotational transforms 0.6–(0)2.0. Electron beam mapping of the vacuum magnetic field was performed using new type of a fluorescent target (movable fluorescent rod array having a transparency about 98%). Up to 150–200 toroidal transits were observed at each electron gun position. The spatial resolution of the system was about 3 mm. Electron collector probes were used for monitoring the positions of the magnetic surfaces in different toroidal field periods. Visible paths of the electron beam due to the excitation of the background gas (p~10−4 Torr) were used for identification of the toroidal transit numbers. This newly developed method gives an accuracy in measurement of the rotational transform of about 1.5%. Experimental surfaces and measured | Permalink: |
http://link.aip.org/link/?RSINAK/66/1163/1 |
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BibSonomy
KEYWORDS and PACS
H&minus,
1 HELIAC,
PLASMA DIAGNOSTICS,
MAGNETIC FIELDS,
MAPPING,
ELECTRON BEAMS,
FLUORESCENCE,
SPATIAL RESOLUTION,
ELECTRON PROBES,
EXCITATION,
TARGETS,
IMAGES,
COMPUTERIZED SIMULATION
- 52.70.Ds
Physics of plasmas and electric discharges Plasma diagnostic techniques and instrumentation Electric and magnetic measurements - 52.55.Hc
Physics of plasmas and electric discharges Magnetic confinement and equilibrium Stellarators, spheromaks, compact tori, bumpy tori, and other toroidal confinement devices - YEAR: 1995
RELATED DATABASES
PUBLICATION DATA
0034-6748 (print)
1089-7623 (online)
AIP
REFERENCES (8)
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