TY  - JOUR
AU  - Jaspers, R.
AU  - Elzendoorn, B. S. Q.
AU  - Donne, A. J. H.
AU  - Soetens, T.
TI  - Spectra polarimetry of the motional stark effect at TEXTOR-94
JO  - Review of scientific instruments
VL  - 72
SN  - 0034-6748
CY  - [S.l.]
PB  - American Institute of Physics
M1  - PreJuSER-45676
SP  - 1018 - 1022
PY  - 2001
N1  - Record converted from VDB: 12.11.2012
AB  - The Balmer-alpha light emitted by neutral particles injected into tokamaks is polarized with respect to the Lorentz electric field experienced by these atoms: E-l = nu xB, known as the motional Stark effect (MSE). On TEXTOR-94 a new MSE system is under development which exploits the full spectral information, along with its polarization. The advantages of exploiting the full spectral information are obvious: beam velocity, observation volume, absolute value of B, the plasma radial electric field and the beam density can in principle all be extracted from the measurement, whereas the polarization can be detected as several lines simultaneously. The TEXTOR-94 MSE system consists of 30 radial channel, of which the full Balmer-alpha spectrum is measured at two orthogonal angles. This is accomplished by inserting a Glan-Laser prism in the optical path. All the optics is located inside the vessel to improve the radial resolution and minimize changes in polarization due to optical elements. Fibers transfer the light by a vacuum feedthrough towards a spectrometer. It is shown that the measured spectra can be adequately fitted. The accuracy for determining the safety factor q is estimated to be 10%-15% and for the radial electric field to be 30 kV/m. (C) 2001 American Institute of Physics.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000166141600165
DO  - DOI:10.1063/1.1319611
UR  - https://juser.fz-juelich.de/record/45676
ER  -