TJ-II:Reflectometry: Difference between revisions
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A fast frequency hopping reflectometer | A fast frequency hopping reflectometer | ||
<ref>[http://link.aip.org/link/?RSINAK/75/3865/1 L. Cupido, J. Sánchez and T. Estrada, Rev. Sci. Intrum. '''75''' (2004) 3865]</ref> | <ref>[http://link.aip.org/link/?RSINAK/75/3865/1 L. Cupido, J. Sánchez and T. Estrada, Rev. Sci. Intrum. '''75''' (2004) 3865]</ref> | ||
working in the Q-band (33 - 50 GHz) was used from 2004 - 2008 in perpendicular incidence (''conventional'' reflectometry) | working in the Q-band (33 - 50 GHz) was used from 2004 - 2008 in [[TJ-II:Sectors|sector]] B8 in perpendicular incidence (''conventional'' reflectometry). The system allowed studies of the velocity shear layer in TJ-II | ||
<ref>[http://dx.doi.org/10.1088/0029-5515/46/9/S14 T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion '''46''' (2006) S792–S798]</ref> | <ref>[http://dx.doi.org/10.1088/0029-5515/46/9/S14 T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion '''46''' (2006) S792–S798]</ref> | ||
. | and of the radial position of its origin. | ||
<ref>[http://dx.doi.org/10.1209/0295-5075/84/65001 T. Happel, T. Estrada, and C. Hidalgo, Europhys. Lett. '''84''' (2008) 65001]</ref> | |||
== Doppler Reflectometer == | == Doppler Reflectometer == | ||
Revision as of 15:59, 22 July 2009
Profile Reflectometer
TJ-II has an AM reflectometer [1] for measuring electron density profiles with a temporal resolution of 2 ms (located between sectors A4 and A5).
Fluctuation Reflectometer
A fast frequency hopping reflectometer [2] working in the Q-band (33 - 50 GHz) was used from 2004 - 2008 in sector B8 in perpendicular incidence (conventional reflectometry). The system allowed studies of the velocity shear layer in TJ-II [3] and of the radial position of its origin. [4]
Doppler Reflectometer
Since February 2009, the frequency hopping system is in operation in oblique incidence (Doppler reflectometry, sector C6) [5], measuring plasma density fluctuation velocities and their wave number spectra. The system is able to measure in a radial range of about ρ = 0.6 - 0.9 (ρ = r/a is the effective plasma radius) and the perpendicular wavenumber can be selected between 3 and 15 cm-1.
References
- ↑ T. Estrada et al., Plasma Phys. Control. Fusion 43 (2001) 1535–1545
- ↑ L. Cupido, J. Sánchez and T. Estrada, Rev. Sci. Intrum. 75 (2004) 3865
- ↑ T. Estrada, E. Blanco, L. Cupido, M.E. Manso, and J. Sánchez, Nucl. Fusion 46 (2006) S792–S798
- ↑ T. Happel, T. Estrada, and C. Hidalgo, Europhys. Lett. 84 (2008) 65001
- ↑ T. Happel, T. Estrada, E. Blanco, V. Tribaldos, A. Cappa, and A. Bustos, Rev. Sci. Instrum. 80 (2009) 073502