`TimeSpectrum`

class nexus.TimeSpectrum(experiment, time_length=200, time_step=0.2, max_detuning=400, electronic=False, time_data=[], intensity_data=[], scaling='auto', background=0.0, offset=0.0, resolution=0.7, distribution_points=1, fit_weight=1.0, bunch_spacing=inf, residual=<nexus.clib.cnexus.Sqrt; proxy of <Swig Object of type 'Residual *'> >, fft_window='auto', coherence=False, id='')

Bases: FitMeasurement

Constructor for the TimeSpectrum class. Class to calculate the time-dependent intensity of the experiment.

Parameters:

id (string) – User identifier.
experiment (Experiment) – Experiment
time_length (float) – Length of the calculation (nanoseconds).
time_step (float) – Step size of the calculation (nanoseconds).
max_detuning (float) – Maximum value of the energy detuning (Gamma). Set this value to speed up the calculation. If set to zero no maximum is applied. Also see fft_window.
electronic (bool) – If True electronic scattering is included.
time_data (list or ndarray) – Time data for fitting (nanoseconds).
intensity_data (list or ndarray) – Intensity data for fitting.
scaling (float or Var or string) – Intensity scaling factor for fitting. Default is auto.
background (float or Var or string) – Background for fitting. Default is 0.
or (offset (float) –
class:Var): Temporal offset of the model. Default is 0.

New in version 1.1.0.
resolution (float or Var) – Resolution value for convolution (nanoseconds). Corresponds to the APD resolution.
distribution_points (int) – Number of points for thickness distributions in forward geometry and angular divergence in grazing geometry. Both distributions assume incoherent summation over the weighted contributions. Default is 1.
fit_weight (float) – Relative weight for the cost function in multi measurement fitting.
bunch_spacing (float) – Spacing of subsequent X-ray bunches in time (nanoseconds).
residual (Residual) – Implementation of the residual calculation used for fitting.
fft_window (string) –
A window function that is applied during the Fourier transformation from energy to time. This should be used when the max_detuning is not zero. Options are
- auto (default) - will pick a Hann window if max_detuning is not zero, no window otherwise.
- Hann
- Hamming
- Sine
- Welch
- Kaiser2 - \(\alpha = 2\)
- Kaiser25 - \(\alpha = 2.5\)
- Kaiser3 - \(\alpha = 3\)
- none
coherence (bool) –
Determines if the summation over the thickness and divergence distributions is performed coherently (True) or incoherently (False). Default is False.

New in version 1.0.3.

id

User identifier.

Type:: string

experiment

Experiment

Type:: Experiment

time_length

Length of the calculation (nanoseconds).

Type:: float

time_step

Step size of the calculation (nanoseconds).

Type:: float

max_detuning

Maximum value of the energy detuning (Gamma). Set this value to speed up the calculation. If set to zero no maximum is applied. Also see fft_window.

Type:: float

electronic

If True electronic scattering is included.

Type:: bool

time_data

Time data for fitting (nanoseconds).

Type:: list

intensity_data

Intensity data for fitting.

Type:: list

data_size

Number of data points of experimental data.

Type:: int

scaling

Intensity scaling factor for fitting.

Type:: Var

background

Background for fitting.

Type:: Var

offset (float or: class:Var): Temporal offset of the model.

New in version 1.1.0.

resolution

Resolution value for convolution (nanoseconds). Corresponds to the APD resolution.

Type:: Var

resolution_kernel

weight of the Gaussian resolution same step size as detuning.

Type:: list

distribution_points

Number of points for thickness distributions in forward geometry and angular divergence in grazing geometry. Both distributions assume incoherent summation over the weighted contributions.

Type:: int

fit_weight

Relative weight for the cost function in multi measurement fitting.

Type:: float

bunch_spacing

Spacing of subsequent X-ray bunches in time (nanoseconds).

Type:: float

residual

Implementation of the residual calculation used for fitting.

Type:: Residual

fft_window

A window function that is applied during the Fourier transformation from energy to time. This should be used when the max_detuning is not zero. Options are

auto (default) - will pick a Hann window if max_detuning is not zero, no window otherwise.
Hann
Hamming
Sine
Welch
Kaiser2 - \(\alpha = 2\)
Kaiser25 - \(\alpha = 2.5\)
Kaiser3 - \(\alpha = 3\)
none

Type:: string

coherence

Determines if the summation over the thickness and divergence distributions is performed coherently (True) or incoherently (False). Default is False.

New in version 1.0.3.

Type:: bool

result

List of intensity values. It is the energy-integrated intensity per time in units of (\(\Gamma /ns\)).

Type:: list

Calculate()

Calculates the class method. Also callable via operator ().

Returns:: Time array of float values. ndarray: Intensity array of float values.
Return type:: ndarray

Plot(data=True, residuals=True, errors=False, datacolor='black', theorycolor='r', theorywidth=2, datalinestyle='none', datamarker='+', datamarkersize=2, datafillstyle='full', legend=True)

Plot the TimeSpectrum.

New in version 1.0.3.

Parameters:

data (bool) – Select if intensity_data should be plot.
residuals (bool) – Select if residuals from fit should be plot.
errors (bool) – select if error bars should be plot.
datacolor (string) – See matplotlib documentation.
theorycolor (string) – See matplotlib documentation.
theorywidth (float) – See matplotlib documentation.
datalinestyle (string) – See matplotlib documentation.
datamarker (string) – See matplotlib documentation.
datamarkersize (float) – See matplotlib documentation.
datafillstyle (string) – See matplotlib documentation.
legend (bool) – Select if legend should be plot when model and data are plot.

TimeSpectrum

`TimeSpectrum`