MAPS

MAPS is a direct-geometry spectrometer at the ISIS Neutron and Muon Source. [1]

References

Versions

MAPS

For details on the parameters associated with the MAPS version, please see the MAPS data.

Models

PyChop_fit

This is the recommended PyChop_fit model - it is an alias for the PyChop_fit_v1 model, which is the model actually containing the data.

Important

PyChop_fit refers to the best version of this model - using a specific version may run the risk using a model with known bugs or other issues and is not advisable unless replicating the results of a given version of the model.

PyChop_fit_v1

This section contains the data for the MAPS instrument associated with the PyChop_fit_v1 model. For more information about how the model works and its implementation, please see resins.models.pychop.PyChopModelFermi. For more information on the model parameters, please see PyChop_fit_v1 model data.

Configurations:

Data

name: "MAPS"
default_version: "MAPS"
version:
    MAPS:
        default_model: "PyChop_fit"
        models:
            PyChop_fit: "PyChop_fit_v1"
            PyChop_fit_v1:
                function: "pychop_fit_fermi"
                citation: ['R. I. Bewley, R. A. Ewings, M. D. Le, T. G. Perring and D. J. Voneshen, 2018. PyChop', 'https://mantidproject.github.io/docs-versioned/v6.10.0/interfaces/direct/PyChop.html']
                parameters:
                    d_chopper_sample: 1.899
                    d_sample_detector: 6.0
                    aperture_width: 0.094
                    theta: 32.0
                    defaults:
                        e_init: 500
                        chopper_frequency: 400
                    restrictions:
                        e_init: [0, 2000]
                        chopper_frequency: [50, 601, 50]
                    frequency_matrix: [[0, 1], [1, 0]]
                    moderator:
                        type: 2
                        scaling_function: "soft_hat"
                        scaling_parameters: [1.0, 0.0, 0.0, 150.0, 0.01, 70.0]
                        measured_wavelength: [3.81593, 5.39537, 2.2052, 2.70006, 3.25499, 1.70813, 3.11649, 1.44378, 2.41516, 1.91018, 2.47745, 1.27303, 2.07872, 1.05928, 1.55951]
                        measured_width: [54, 62, 40, 44, 48, 35, 47, 30, 41, 37, 40, 25, 38, 20, 31]
                        parameters: [38.6, 0.5226]
                    detector:
                        type: 2
                        phi: 0.0
                        depth: 0.025
                    sample:
                        type: 0
                        thickness: "2e-3"
                        width: 0.048
                        height: 0.048
                        gamma: 0.0
                    choppers:
                        Disk:
                            distance: 8.831
                            nslot: 4
                            slot_width: 68
                            slot_ang_pos: [-180.0, -39.1, 0.0, 39.1]
                            guide_width: 50
                            radius: 375
                            num_disk: 1
                            is_phase_independent: True
                            default_phase: "1"
                        Fermi:
                            distance: 10.143
                            aperture_distance: 8.27
                configurations:
                    chopper_package:
                        default_option: "A"
                        A:
                            pslit: 0.001087
                            radius: 0.049
                            rho: 1.3
                            tjit: 0.0
                        B:
                            pslit: 0.001812
                            radius: 0.049
                            rho: 0.92
                            tjit: 0.0
                        S:
                            pslit: 0.002899
                            radius: 0.049
                            rho: 1.3
                            tjit: 0.0