Exploiting a transmission grating spectrometer
The availability of compact transmission grating spectrometers now allows an attractive and economical alternative to the more familiar Czerny–Turner configuration for many high-temperature plasm...
The availability of compact transmission grating spectrometers now allows an attractive and economical alternative to the more familiar Czerny–Turner configuration for many high-temperature plasm...
High resolution transmission grating spectrometer for edge toroidal rotation measurements of tokamak plasmas
We present a high throughput (f/3) visible (3500–7000 Å) Doppler spectrometer for toroidal rotation velocity measurements of the Alcator C-Mod tokamak plasma. The spectrometer ha...
We present a high throughput (f/3) visible (3500–7000 Å) Doppler spectrometer for toroidal rotation velocity measurements of the Alcator C-Mod tokamak plasma. The spectrometer ha...
Diagnostic method for the measurement of coherent magnetic field fluctuations
Rev. Sci. Instrum. 75, 4162 (2004); doi:10.1063/1.1789590
Published 13 October 2004
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The motional Stark diagnostic has been proven to provide excellent measurements of the pitch angle of the equilibrium magnetic field in tokamaks. In this work, we explore its feasability for obtaining the pitch angle modulation of the magnetic field due to coherent fluctuations. Theoretical calculations for a signal with periodic pitch angle variation indicate that fluctuations in the magnetic pitch angle can be derived from spectral lines offset from the second harmonics of the retarder drive frequencies. The calculations agree well with laboratory simulations of magnetic fluctuations using spectral analysis.
©2004 American Institute of Physics
| History: | Presented 21 April 2004; published 13 October 2004 |
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http://link.aip.org/link/?RSINAK/75/4162/1 |
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