# Changeset 3aa3351 in sasview

Ignore:
Timestamp:
May 18, 2018 7:47:15 AM (13 months ago)
Branches:
ESS_GUI, ESS_GUI_batch_fitting, ESS_GUI_bumps_abstraction, ESS_GUI_iss1116, ESS_GUI_iss879, ESS_GUI_iss959, ESS_GUI_opencl, ESS_GUI_ordering, ESS_GUI_sync_sascalc
Children:
085e3c9d
Parents:
b10cf92
Message:

Documentation for Q resolution calculator updated

Location:
src/sas/qtgui/Calculators/media
Files:
2 edited

### Legend:

Unmodified
 r417c03f ----------- This tool is approximately estimates the resolution of $Q$ from SAS instrumental This tool approximately estimates the resolution of $Q$ from SAS instrumental parameter values assuming that the detector is flat and normal to the incident beam. -------------- 1) Select *SAS Resolution Estimator* from the *Tool* menu on the SasView toolbar. 1) Select *Q Resolution Estimator* from the *Tool* menu on the SasView toolbar. 2) Select the source (Neutron or Photon) and source type (Monochromatic or TOF). 2) Select the source and source type (Monochromatic or TOF). *NOTE! The computational difference between the sources is only the range. Optionally, the wavelength (BUT NOT of the wavelength spread) can be extended Optionally, the wavelength (BUT NOT the wavelength spread) can be extended by adding '; nn' where the 'nn' specifies the number of the bins for the numerical integration. The default value is nn = 10. The same number of bins 7) 1D and 2D $dQ$ values will be displayed at the bottom of the panel, and a 2D resolution weight distribution (a 2D elliptical Gaussian function) will also be displayed in the plot panel even if the $Q$ inputs are outside of the detector limit (the red lines indicate the limits of the detector). be displayed in the plot panel. TOF only: green lines indicate the limits of the maximum $Q$ range accessible for the longest wavelength due to the size of the detector. Note that the effect from the beam block/stop is ignored, so in the small $Q$ Note that the effect from the beam block/stop is ignored. So, in the small $Q$ region near the beam block/stop 8) A summary of the calculation is written to the SasView *Console* at the bottom of the main SasView window. bottom of the main SasView window, below the plot. .. image:: resolution_tutor.png .. figure:: resolution_tutor.png .. 1) Define the source. Select *Photon* for X-ray. This selection only affects the gravitational contribution of the resolution 2) Select between *Monochromatic* or *TOF* 3) For *TOF*, there is the option of loading a custom spectral distribution using *Add New* in the combo box 4) *Wavelength* and *wavelength spread*: one value for *Monochromatic*, minimum and maximum of range for *TOF* 5) For *Source* and *Sample Size Aperture*, one value for a circular aperture (diameter) and two values separated by a comma (,) for a rectangular slit (side lengths) 6) One value for one ($Qx$, $Qy$) location or more values separated by a comma (,) for more locations. *Note: the $Qx$, $Qy$ input boxes should have the same number of values.* 7) Click on *Compute* button to start the calculation 8) *Sigma_x* and *Sigma_y* are the components of the 2D $dQ$ at the last ($Qx$, $Qy$) point of inputs 9) *Sigma_lamd* is the 2D $dQ_{\lambda}$ at the last point of inputs. *Note: $dQ_{\lambda}$ has only the Qr directional component* 10) *(1D Sigma)* is the 1D $dQ$ at the last ($Qx$, $Qy$) point of inputs 11) Plot of the result. For *TOF*, a green rectangle marks the limits of maximum $Q$  range accessible for the longest wavelength due to the size of the detector. .. ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ