SANSMaskWorkspace dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| SANSState | Input | Dictionary | A property manager which fulfills the SANSState contract. | |
| Workspace | InOut | MatrixWorkspace | Mandatory | The sample scatter workspace. This workspace does not contain monitors. |
| Component | Input | string | LAB | The component of the instrument which is to be masked. Allowed values: [‘LAB’, ‘HAB’] |
This algorithm masks a SANS workspace according to the settings in the state object. The user can specify which detector to mask. Currently the mask mechanism is implemented for SANS2D, LOQ and LARMOR.
There are several types of masking which are currently supported:
The required information for the mask operation is retrieved from a state object. The state for masking is a composite of general settings and detector specific settings (see below).
The elements of the general mask state are:
| Entry | Type | Description | Mandatory | Default value |
|---|---|---|---|---|
| radius_min | Float | Minimum radius in m for the radius mask | No | None |
| radius_min | Float | Maximum radius in m for the radius mask | No | None |
| bin_mask_general_start | List of Float | A list of start values for time masking | No | None |
| bin_mask_general_stop | List of Float | A list of stop values for time masking | No | None |
| mask_files | List of String | A list of mask file names | No | None |
| phi_min | Float | Minimum angle for angle masking | No | None |
| phi_max | Float | Maximum angle for angle masking | No | None |
| use_mask_phi_mirror | Bool | If a mirrored angle mask is to be used | No | None |
| beam_stop_arm_width | Float | Size fo the beam stop arm in m | No | None |
| beam_stop_arm_angle | Float | Angle of the beam stop arm | No | None |
| beam_stop_arm_pos1 | Float | First coordinate of the beam stop position | No | None |
| beam_stop_arm_pos2 | Float | Second coordinate of the beam stop position | No | None |
| clear | Bool | If the spectra mask is to be cleared | No | None |
| clear_time | Float | If the time mask is to be cleared | No | None |
| single_spectra | List of Integer | List of spectra which are to be masked | No | None |
| spectrum_range_start | List of Integer | List of specra where a range mask starts | No | None |
| spectrum_range_stop | List of Integer | List of specra where a range mask stops | No | None |
| detectors | Dict | A map to detector-specific settings | No | None |
| idf_path | String | The path to the IDF | auto setup | auto setup |
The detectors dictionary above maps to a mask state object for the individual detectors :
| Entry | Type | Description | Mandatory | Default value |
|---|---|---|---|---|
| single_vertical_strip_mask | List of Integer | A list of vertical strip masks | No | 0.0 |
| range_vertical_strip_start | List of Integer | A list of start spectra for vertical strip mask ranges | No | 0.0 |
| range_vertical_strip_stop | List of Integer | A list of stop spectra for vertical strip mask ranges | No | 0.0 |
| single_horizontal_strip_mask | List of Integer | A list of horizontal strip masks | No | 0.0 |
| range_horizontal_strip_start | List of Integer | A list of start spectra for horizontal strip mask ranges | No | 0.0 |
| range_horizontal_strip_stop | List of Integer | A list of stop spectra for horizontal strip mask ranges | No | 0.0 |
| block_horizontal_start | List of Integer | A list of start spectra for the horizontal part of block masks | No | 0.0 |
| block_horizontal_stop | List of Integer | A list of stop spectra for the horizontal part of block masks | No | 0.0 |
| block_vertical_start | List of Integer | A list of start spectra for the vertical part of block masks | No | 0.0 |
| block_vertical_stop | List of Integer | A list of stop spectra for the vertical part of block masks | No | 0.0 |
| block_cross_horizontal | List of Integer | A list of spectra for the horizontal part of cross block masks | No | 0.0 |
| block_cross_vertical | List of Integer | A list of spectra for the vertical part of cross block masks | No | 0.0 |
Note that these settings should be only populated via the GUI or the Python Interface of ISIS SANS.
The LAB (low angle bank) setting selects the first detector of the instrument.
The HAB (high angle bank) setting selects the first detector of the instrument.
Categories: Algorithms | SANS\Mask
Python: SANSMaskWorkspace.py