TJ-II:Spectroscopy: Difference between revisions

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[[Image:spectrometer-setup.png|frame|Observation geometry of nine-channel high-resolution spectroscopic diagnostic system]]
[[TJ-II]] disposes of an nine-channel, high-resolution, spectroscopic diagnostic system. This system is currently being used to measure impurity ion temperature and poloidal rotation using passive emission spectroscopy. The principal features of the diagnostic include independent focusing of its channels, high sensitivity for performing Doppler measurements in plasmas, as well as a flexible and fast in-house-developed software program for performing integrated data reduction and analysis.
[[TJ-II]] disposes of an nine-channel, high-resolution, spectroscopic diagnostic system. This system is currently being used to measure impurity ion temperature and poloidal rotation using passive emission spectroscopy. The principal features of the diagnostic include independent focusing of its channels, high sensitivity for performing Doppler measurements in plasmas, as well as a flexible and fast in-house-developed software program for performing integrated data reduction and analysis.
<ref>[http://link.aip.org/link/?RSINAK/72/971/1 A. Baciero et al, ''A multi-channel spectroscopic system for measuring impurity ion temperatures and poloidal rotation velocities in TJ-II'', Rev. Sci. Instrum. '''72''' (2001) 971]</ref>
<ref>[http://link.aip.org/link/?RSINAK/72/971/1 A. Baciero et al, ''A multi-channel spectroscopic system for measuring impurity ion temperatures and poloidal rotation velocities in TJ-II'', Rev. Sci. Instrum. '''72''' (2001) 971]</ref>
<ref>[http://www.new.ans.org/pubs/journals/fst/a_1264 B. Zurro et al, ''Comparison of Impurity Poloidal Rotation in ECRH and NBI Discharges of the TJ-II HELIAC'', Fusion Science and Technology '''50''', 3 (2006) 419-427]</ref>. This experimental system has been also used to measure proton rotation using spectral line emission from excited fast neutrals created from inner core plasma protons via charge exchange transfer reactions. <ref>[http://link.aip.org/link/?RSINAK/74/2056/1 B. Zurro et al, ''Investigation of proton rotation measurements using hydrogen line wings in the TJ-II stellarator'', Rev. Sci. Instrum. '''74''' (2003) 2056]</ref>
<ref>[http://www.new.ans.org/pubs/journals/fst/a_1264 B. Zurro et al, ''Comparison of Impurity Poloidal Rotation in ECRH and NBI Discharges of the TJ-II HELIAC'', Fusion Science and Technology '''50''', 3 (2006) 419-427]</ref>. This experimental system has been also used to measure proton rotation using spectral line emission from excited fast neutrals created from inner core plasma protons via charge exchange transfer reactions. <ref>[http://link.aip.org/link/?RSINAK/74/2056/1 B. Zurro et al, ''Investigation of proton rotation measurements using hydrogen line wings in the TJ-II stellarator'', Rev. Sci. Instrum. '''74''' (2003) 2056]</ref>
[[Image:spectrometer-setup.png|frame|Observation geometry of nine-channel high-resolution spectroscopic diagnostic system]]


A method for measuring absolutely calibrated toroidal rotation velocities consists of simultaneously recording the emission lines from the plasma and from a calibration lamp by means of a double fiber-fiber guide.
A method for measuring absolutely calibrated toroidal rotation velocities consists of simultaneously recording the emission lines from the plasma and from a calibration lamp by means of a double fiber-fiber guide.

Revision as of 15:36, 3 September 2009

Observation geometry of nine-channel high-resolution spectroscopic diagnostic system

TJ-II disposes of an nine-channel, high-resolution, spectroscopic diagnostic system. This system is currently being used to measure impurity ion temperature and poloidal rotation using passive emission spectroscopy. The principal features of the diagnostic include independent focusing of its channels, high sensitivity for performing Doppler measurements in plasmas, as well as a flexible and fast in-house-developed software program for performing integrated data reduction and analysis. [1] [2]. This experimental system has been also used to measure proton rotation using spectral line emission from excited fast neutrals created from inner core plasma protons via charge exchange transfer reactions. [3]

A method for measuring absolutely calibrated toroidal rotation velocities consists of simultaneously recording the emission lines from the plasma and from a calibration lamp by means of a double fiber-fiber guide. [4]

A vacuum ultraviolet spectrometer is used for performing spectral surveys and specialized plasma studies. [5] [6]

The chord-integrated emissions of spectral lines are monitored by using a spectral system with time and space scanning capabilities and relative calibration over the entire UV-visible spectral range. This system has been used to study the line ratio of lines of different ionization stages of carbon C5+ 5290 Å and C4+ 2271 Å for plasma diagnostic purposes. [7]

References