SpectraPLOT: Plot Settings and Instrumental Effects

Plot item parameters are set using the Plot Item Properties panel.

The Plot Item Properties panel is automatically displayed when a setting up a new plot window. Alternative, plot items can be edited by double-clicking on the item in the Plot Items List.

Only parameters that are relevant to a particular plot item are displayed in the panel. Example panel displays for plot items from Spectrum, Image, and Space-Resolved Spectrum plot windows are shown below.

The Plot Settings Panel contains the following parameters.

Plot Name: A user-specified name for the plot item. In line plot windows (e.g., Spectrum and Time-Dependent Flux plot windows), the Plot Name is used in setting the default name in the legend.

Run Name: One of the Run Names that are contained in the Run Results List.

Detector: The name of one of the detectors used in the SPECT3D run.

Time Settings: Specifies whether to plot Instantaneous or Time-Integrated results. For Instantaneous (image below left), select the Simulation Time. For Time-Integrated (image below right), select the time-integration profile (Square or Gaussian), and enter the profile parameters (min/max time for Square profile; center time and FWHM for Gaussian profile).

If the gate time extends beyond the simulation times, the spectrum from the last simulation time is extended up to the end of the gate. The same is true for a gate whose initial time extends below the first simulation time (in the case where the first simulation time is greater than zero), except that it will truncate at time zero.

NOTE: In Spectrum plot windows, all of the items must be either Instantaneous or Time-Integrated. Because of this, if a plot window contains more than one plot item, changing between Instantaneous and Time-Integrated is not allowed.

Multiple time gates can be used when generating Time-Integrated Images. When this is desired, check the Multiple Time Gates box, and specify the number of gates and time between gates. (Each "gate" is a repetition of the first time-integration window at successively later times.)

Spectral Resolution: When specifying a non-zero spectral resolution, the SPECT3D spectral intensities are convolved with Gaussian response function with a full width at half maximum (FWHM) which is defined using one of the following:

• Constant resolution power (E/ΔE or λ/Δλ )(ΔE and Δλ = FWHM)
• Constant wavelength resolution (Δλ)
• Constant photon energy resolution (ΔE)
  When applying either a constant wavelength resolution or a constant photon energy resolution, the units must also be specified.

Spatial Resolution: When specifying a non-zero Spatial Resolution, Δ, the SPECT3D space-dependent intensities are convolved with Gaussian response function (Δ = FWHM).

Time Resolution: When specifying a non-zero Time Resolution, Δt, the SPECT3D time-resolved intensities are convolved with Gaussian response function (Δt = FWHM).

Pixel Data Type: For Image and Space-Resolved Spectrum plot windows, several types of images can potentially be displayed. The types of output available depend on the options selected when setting up the SPECT3D simulation (using the Detector and Output panels of SPECT3D).

Image plot windows: Output can be displayed from two types of SPECT3D-generated files: (i) *.dti file, which contains frequency-integrated data for each detector pixel, and (ii) *.bsc file, which contains frequency-binned data. In the latter case, frequency-dependent Filtering (see below) can be applied, and only the intensity can be displayed. In the *.dti file, a variety of imaging data is potentially available from the SPECT3D simulation, including:

• Unfiltered intensity
• Filtered intensities specified in the SPECT3D Detector panel (XRD, Framing Camera, and Electron Density Diagnostics tabs)
• Monochromatic intensities and optical depths, specified in the SPECT3D Output panel (Photon Energies tab)
• Areal density (integral of ρ*ΔL along each detector pixel's line-of-sight)

Space-Resolved Spectra plot windows: Types include:

• Horizontally resolved
• Vertically resolved
• Crystal slit imaging

Filter Properties: SPECT3D intensities can be convolved with a frequency-dependent filter response function (transmission function). Available options for specifying the response function include:

• A series of atomic elements, each having a given thickness (defined using its areal density ρ*ΔL in units of g/cm²)
• A Square transmission function, defined using a minimum and maximum photon energy
• A Gaussian transmission function, defined using a central photon energy and full width at half max (FWHM)
• A two-column file contain transmission vs. photon energy (photon energy in eV is in the first column).

The transmission function can be displayed by clicking the Plot button located within the Filter Properties box.

Next