[ Identification | Description | Input parameters | Links ]
Union_abs_logger_1D_space_tof_to_lambda ComponentPart of the Union components, a set of components that work together and thus separates geometry and physics within McStas. The use of this component requires other components to be used. 1) One specifies a number of processes using process components 2) These are gathered into material definitions using Union_make_material 3) Geometries are placed using Union_box/cylinder/sphere, assigned a material 4) Logger and conditional components can be placed which will record what happens 5) A Union_master component placed after all of the above Only in step 5 will any simulation happen, and per default all geometries defined before this master, but after the previous will be simulated here. There is a dedicated manual available for the Union_components This component is an absorption logger, and thus placed in point 4) above. A absorption logger will log something for each absorption event happening in the geometry or geometries on which it is attached. These are specified in the target_geometry string. By leaving it blank, all geometries are logged, even the ones not defined at this point in the instrument file. Multiple geometries are specified as a comma separated list. This absorption logger records the absorbed intensity as a function of the measured and true wavelength. The measured wavelength is calculated from the time of flight and distance travelled. This distance is a constant from source to sample added to the distance from the sample position to the detector pixel in which the event is detected. The true wavelength is calculated directly from the velocity. This information shows any error in conversion from tof to wavelength, especially from any added travelled distance from multiple scattering. The lambda_min, max and bin parameters are used to set both the range for measured and true wavelength. If either of these, denoted lambda_m and lambda_t respectively, is set they will overwrite the lambda setting for that part. Sine most data will be along the line lambda_m = lambda_t, it is possible to record lambda_m / lambda_t as a function of lambda_t, which will be close to 1.0. This mode is selected by setting relative_measured to 1, and then the range can be selected with relative_min, max and bins. This absorption logger needs to be placed in space, the position is recorded in the coordinate system of the logger component. Note the detection is along the y axis of the component, so it is natural to place it relative to a cylinder. It is possible to attach one or more conditional components to this absorption logger. Such a conditional component would impose a condition on the state of the neutron after the Union_master component that executes the simulation, and the absorption logger will only record the event if this condition is true. To use the logger_conditional_extend function, set it to some integer value n and make and extend section to the master component that runs the geometry. In this extend function, logger_conditional_extend[n] is 1 if the conditional stack evaluated to true, 0 if not. This way one can check what rays is logged using regular McStas monitors. Only works if a conditional is applied to this logger.
| Name | Unit | Description | Default | |
| ref_component | no quotes | Reference component instance, sample position for distance calculation | ||
| target_geometry | string | Comma separated list of geometry names that will be logged, leave empty for all volumes (even not defined yet) | "NULL" | |
| yheight | m | Height of absorption logger | ||
| yn | 1 | number of bins along y axis | ||
| source_sample_dist | m | Travel distance between source and sample position, used to calculate total travelled distance | 0.0 | |
| lambda_min | AA | Minimum wavelength recorded (sets both lambda_m_min and lambda_t_min) | -1 | |
| lambda_max | AA | Maximum wavelength recorded (sets both lambda_m_max and lambda_t_max) | -1 | |
| lambda_bins | 1 | number of wavelength bins | -1 | |
| lambda_m_min | AA | Minimum measured wavelength recorded from tof and travelled distance (overwrites lambda_min) | -1 | |
| lambda_m_max | AA | Maximum measured wavelength recorded from tof and travelled distance (overwrites lambda_max) | -1 | |
| lambda_m_bins | 1 | number of measured wavelength bins | -1 | |
| lambda_t_min | AA | Minimum measured wavelength recorded from tof and travelled distance (overwrites lambda_min) | -1 | |
| lambda_t_max | AA | Maximum measured wavelength recorded from tof and travelled distance (overwrites lambda_max) | -1 | |
| lambda_t_bins | 1 | number of true wavelength bins | -1 | |
| relative_measured | 1 | Default 0, records measured as function of true wavelength, if this is enabled, records measured relative to true wavelength | 0 | |
| relative_min | 1 | Smallest value of measured / true wavelength in histogram | 0.5 | |
| relative_max | 1 | Largest value of measured / true wavelength in histogram | 1.5 | |
| relative_bins | 1 | Number of bins on histogram axis with measured divided by true wavelength | 100 | |
| filename | string | Filename of produced data file | "NULL" | |
| order_total | 1 | Only log rays that have scattered n times, -1 for all orders | -1 | |
| order_volume | 1 | Only log rays that have scattered n times in the same geometry, -1 for all orders | -1 | |
| logger_conditional_extend_index | 1 | If a conditional is used with this logger, the result of each conditional calculation can be made available in extend as a array called "logger_conditional_extend", and one would then access logger_conditional_extend[n] if logger_conditional_extend_index is set to n | -1 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Union_abs_logger_1D_space_tof_to_lambda.comp.
[ Identification | Description | Input parameters | Links ]
Generated on 2024-01-03 11:47:43