thomson_scattering - IMAS Data Dictionary documentation

See common IDS structure reference: ids_properties.

midplanestructure ¶Choice of midplane definition for the mapping of measurements […]

Choice of midplane definition for the mapping of measurements on an equilibrium. Indicate the IMAS URI of the used equilibrium IDS in the ids_properties/provenance section.

This is an identifier. See midplane_identifier for the available options.

New in version >3.32.1.

midplane/name STR_0D ¶Short string identifier

Short string identifier

midplane/index INT_0D ¶Integer identifier (enumeration index within a list). […]

Integer identifier (enumeration index within a list). Private identifier values must be indicated by a negative index.

midplane/description STR_0D ¶Verbose description

Verbose description

channel(i1)AoS ¶Set of channels (lines-of-sight)

Set of channels (lines-of-sight)

Maximum occurrences (MDS+ backend only): 150

	Coordinate
1	`1...N`

channel(i1)/name STR_0D ¶Short string identifier (unique for a given device)

Short string identifier (unique for a given device)

channel(i1)/description STR_0D ¶Description, e.g. […]

Description, e.g. “channel viewing the upper divertor”

New in version >3.

channel(i1)/line_of_sightstructure ¶Description of the line of sight of the channel, given by 2 points

Description of the line of sight of the channel, given by 2 points

New in version >3.41.0.

channel(i1)/line_of_sight/first_pointstructure ¶Position of the first point

Position of the first point

channel(i1)/line_of_sight/first_point/r ⇹mFLT_0D ¶Major radius

Major radius

channel(i1)/line_of_sight/first_point/phi ⇹radFLT_0D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

channel(i1)/line_of_sight/first_point/z ⇹mFLT_0D ¶Height

Height

channel(i1)/line_of_sight/second_pointstructure ¶Position of the second point

Position of the second point

channel(i1)/line_of_sight/second_point/r ⇹mFLT_0D ¶Major radius

Major radius

channel(i1)/line_of_sight/second_point/phi ⇹radFLT_0D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

channel(i1)/line_of_sight/second_point/z ⇹mFLT_0D ¶Height

Height

channel(i1)/polychromator_index INT_0D ¶Index of the polychromator used by this channel (refers to the […]

Index of the polychromator used by this channel (refers to the ../../polychromator array)

New in version >3.41.0.

channel(i1)/scattering_angle(:) ⇹radFLT_1D ¶Angle formed by the laser beam wave vector and the line of sight, […]

Angle formed by the laser beam wave vector and the line of sight, counted clockwise when projected in the poloidal plane

	Coordinate
1	`laser`

New in version >3.41.0.

channel(i1)/scattering_length ⇹mFLT_0D ¶Length of the light scattering volume (full width) along the […]

Length of the light scattering volume (full width) along the laser beam path, for this line of sight (i.e. length of the intersection between the laser beam and the viewing cone). This is a time average value in case of different lasers fired at different times

New in version >4.0.0.

channel(i1)/solid_angle INT_0D ¶Solid angle of the line of sight

Solid angle of the line of sight

New in version >3.41.0.

channel(i1)/positionstructure ¶Average position of the measurements (intersection between laser […]

Average position of the measurements (intersection between laser beam and line of sight)

channel(i1)/position/r ⇹mFLT_0D ¶Major radius

Major radius

channel(i1)/position/phi ⇹radFLT_0D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

channel(i1)/position/z ⇹mFLT_0D ¶Height

Height

channel(i1)/delta_positionstructure ¶Incremental variation of the position of the measurements, due […]

Incremental variation of the position of the measurements, due to e.g. different lasers not intersecting the line of sight at the same position. The actual position is then the static position + delta_position

channel(i1)/delta_position/r(:) ⇹mFLT_1D ¶Major radius

Major radius

	Coordinate
1	`channel(i1)/delta_position/time`

channel(i1)/delta_position/phi(:) ⇹radFLT_1D ¶Toroidal angle

Toroidal angle

	Coordinate
1	`channel(i1)/delta_position/time`

channel(i1)/delta_position/z(:) ⇹mFLT_1D ¶Height

Height

	Coordinate
1	`channel(i1)/delta_position/time`

channel(i1)/delta_position/time(:)sFLT_1D ¶Time for the R,Z,phi coordinates

Time for the R,Z,phi coordinates

	Coordinate
1	`1...N`

channel(i1)/position_per_laserstructure ¶Position of the intersection between each laser beam and this […]

Position of the intersection between each laser beam and this line of sight

	Coordinate
1	`laser`

channel(i1)/position_per_laser/r(:) ⇹mFLT_1D ¶Major radius

Major radius

	Coordinate
1	`1...N`

channel(i1)/position_per_laser/phi(:) ⇹radFLT_1D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

	Coordinate
1	`channel(i1)/position_per_laser/r`

channel(i1)/position_per_laser/z(:) ⇹mFLT_1D ¶Height

Height

	Coordinate
1	`channel(i1)/position_per_laser/r`

channel(i1)/distance_separatrix_midplanemstructure ¶Distance between the measurement position and the separatrix, […]

Distance between the measurement position and the separatrix, mapped along flux surfaces to the outboard midplane, in the major radius direction. Positive value means the measurement is outside of the separatrix.

New in version >3.32.1.

channel(i1)/distance_separatrix_midplane/data(:) ⇹mFLT_1D ¶Data

Data

	Coordinate
1	`channel(i1)/distance_separatrix_midplane/time`

channel(i1)/distance_separatrix_midplane/time(:)sFLT_1D ¶Time

Time

	Coordinate
1	`1...N`

channel(i1)/t_eeVstructure ¶Electron temperature

Electron temperature

channel(i1)/t_e/data(:) ⇹eVFLT_1D ¶Data

Data

	Coordinate
1	`channel(i1)/t_e/time`

channel(i1)/t_e/validity_timed(:)INT_1D ¶Indicator of the validity of the data for each time slice. […]

Indicator of the validity of the data for each time slice. 0: valid from automated processing, 1: valid and certified by the diagnostic RO; - 1 means problem identified in the data processing (request verification by the diagnostic RO), -2: invalid data, should not be used (values lower than -2 have a code-specific meaning detailing the origin of their invalidity)

	Coordinate
1	`channel(i1)/t_e/time`

channel(i1)/t_e/validity INT_0D ¶Indicator of the validity of the data for the whole acquisition […]

Indicator of the validity of the data for the whole acquisition period. 0: valid from automated processing, 1: valid and certified by the diagnostic RO; - 1 means problem identified in the data processing (request verification by the diagnostic RO), -2: invalid data, should not be used (values lower than -2 have a code-specific meaning detailing the origin of their invalidity)

channel(i1)/t_e/time(:)sFLT_1D ¶Time

Time

	Coordinate
1	`1...N`

channel(i1)/n_em^-3structure ¶Electron density

Electron density

channel(i1)/n_e/data(:) ⇹m^-3FLT_1D ¶Data

Data

	Coordinate
1	`channel(i1)/n_e/time`

channel(i1)/n_e/validity_timed(:)INT_1D ¶Indicator of the validity of the data for each time slice. […]

Indicator of the validity of the data for each time slice. 0: valid from automated processing, 1: valid and certified by the diagnostic RO; - 1 means problem identified in the data processing (request verification by the diagnostic RO), -2: invalid data, should not be used (values lower than -2 have a code-specific meaning detailing the origin of their invalidity)

	Coordinate
1	`channel(i1)/n_e/time`

channel(i1)/n_e/validity INT_0D ¶Indicator of the validity of the data for the whole acquisition […]

Indicator of the validity of the data for the whole acquisition period. 0: valid from automated processing, 1: valid and certified by the diagnostic RO; - 1 means problem identified in the data processing (request verification by the diagnostic RO), -2: invalid data, should not be used (values lower than -2 have a code-specific meaning detailing the origin of their invalidity)

channel(i1)/n_e/time(:)sFLT_1D ¶Time

Time

	Coordinate
1	`1...N`

channel(i1)/gaussian_fit(:,:) ⇹mixedFLT_2D ¶Amplitude of the gaussian fit of the measured signal in each […]

Amplitude of the gaussian fit of the measured signal in each energy band, used to estimate the electron temperature

	Coordinate
1	`polychromator(channel(i1)/polychromator_index)/wavelength_band`
2	`channel(i1)/t_e/time`

New in version >3.41.0.

laser(i1)AoS ¶Set of probing lasers

Set of probing lasers

Maximum occurrences (MDS+ backend only): 3

	Coordinate
1	`1...N`

New in version >3.41.0.

laser(i1)/energy_inJstructure ¶Energy of the laser pulse measured just before entering the vacuum […]

Energy of the laser pulse measured just before entering the vacuum vessel

laser(i1)/energy_in/data(:) ⇹JFLT_1D ¶Data

Data

	Coordinate
1	`laser(i1)/energy_in/time`

laser(i1)/energy_in/time(:)sFLT_1D ¶Time

Time

	Coordinate
1	`1...N`

laser(i1)/energy_outJstructure ¶Energy of the laser pulse measured after crossing the plasma

Energy of the laser pulse measured after crossing the plasma

laser(i1)/energy_out/data(:) ⇹JFLT_1D ¶Data

Data

	Coordinate
1	`laser(i1)/energy_out/time`

laser(i1)/energy_out/time(:)sFLT_1D ¶Time

Time

	Coordinate
1	`1...N`

laser(i1)/start_pointstructure ¶Position of the laser start point

Position of the laser start point

laser(i1)/start_point/r ⇹mFLT_0D ¶Major radius

Major radius

laser(i1)/start_point/phi ⇹radFLT_0D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

laser(i1)/start_point/z ⇹mFLT_0D ¶Height

Height

laser(i1)/end_pointstructure ¶Position of the laser end point

Position of the laser end point

New in version >4.0.0.

laser(i1)/end_point/r ⇹mFLT_0D ¶Major radius

Major radius

laser(i1)/end_point/phi ⇹radFLT_0D ¶Toroidal angle (oriented counter-clockwise when viewing from […]

Toroidal angle (oriented counter-clockwise when viewing from above)

laser(i1)/end_point/z ⇹mFLT_0D ¶Height

Height

laser(i1)/wavelength ⇹mFLT_0D ¶Laser wavelength

Laser wavelength

New in version >4.0.0.

laser(i1)/area ⇹mFLT_0D ¶Laser cross sectional area

Laser cross sectional area

New in version >4.0.0.

polychromator(i1)AoS ¶Set of polychromators

Set of polychromators

Maximum occurrences (MDS+ backend only): 40

	Coordinate
1	`1...N`

New in version >3.41.0.

polychromator(i1)/wavelength_band(i2)AoS ¶Set of wavelength bands in which photons are counted by the polychromator

Set of wavelength bands in which photons are counted by the polychromator

Maximum occurrences (MDS+ backend only): 8

	Coordinate
1	`1...N`

polychromator(i1)/wavelength_band(i2)/wavelength_lower ⇹mFLT_0D ¶Lower bound of the detector wavelength range

Lower bound of the detector wavelength range

polychromator(i1)/wavelength_band(i2)/wavelength_upper ⇹mFLT_0D ¶Upper bound of the detector wavelength range

Upper bound of the detector wavelength range

polychromator(i1)/wavelength_band(i2)/wavelengths(:) ⇹mFLT_1D ¶Array of wavelength values

Array of wavelength values

	Coordinate
1	`1...N`

polychromator(i1)/wavelength_band(i2)/detection_efficiency(:) ⇹1FLT_1D ¶Probability of detection of a photon impacting the detector as […]

Probability of detection of a photon impacting the detector as a function of its wavelength

	Coordinate
1	`polychromator(i1)/wavelength_band(i2)/wavelengths`

polychromator(i1)/calibration_absolute(:) ⇹1FLT_1D ¶Factor to be multiplied by the spectral calibration to obtain […]

Factor to be multiplied by the spectral calibration to obtain the instrument function (fraction of signal received on each energy channel when a photon of relevant energy enters the optical system)

	Coordinate
1	`polychromator(i1)/wavelength_band`

polychromator(i1)/calibration_absolute_date STR_0D ¶Date at which the absolute calibration was carried out

Date at which the absolute calibration was carried out

polychromator(i1)/calibration_spectral(:) ⇹1FLT_1D ¶Polychromator response function: fraction of signal received […]

Polychromator response function: fraction of signal received on each energy channel when a photon of relevant energy enters the polychromator.

	Coordinate
1	`polychromator(i1)/wavelength_band`

polychromator(i1)/calibration_spectral_date STR_0D ¶Date at which the spectral calibration was carried out

Date at which the spectral calibration was carried out

latency ⇹sFLT_0D ¶Upper bound of the delay between physical information received […]

Upper bound of the delay between physical information received by the detector and data available on the real-time (RT) network.

New in version >3.32.1.

codestructure ¶

See common IDS structure reference: code.

time(:)sFLT_1D ¶Generic time

Generic time

	Coordinate
1	`1...N`

thomson_scattering¶

`thomson_scattering`¶