CNCS
CNCS is a direct-geometry, cold-neutron spectrometer at the Oak Ridge National Laboratory. [1]
References
Versions
CNCS (default)
CNCS
For details on the parameters associated with the CNCS version, please see the CNCS data.
Models
PyChop_fit (default)
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 CNCS instrument associated with the PyChop_fit_v1 model. For more information about how the model works and its implementation, please see resins.models.pychop.PyChopModelCNCS. For more information on the model parameters, please see PyChop_fit_v1 model data.
Configurations:
-
High Flux (default)
Data
name: "CNCS"
default_version: "CNCS"
version:
CNCS:
default_model: "PyChop_fit"
models:
PyChop_fit: "PyChop_fit_v1"
PyChop_fit_v1:
function: "pychop_fit_cncs"
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: 1.48
d_sample_detector: 3.5
aperture_width: 0.0
theta: 32.0
defaults:
e_init: 20
resolution_disk_frequency: 300
fermi_frequency: 60
restrictions:
e_init: [0.5, 80]
resolution_disk_frequency: [60, 301, 60]
fermi_frequency: [60, 301, 60]
constant_frequencies: [0, 60, 60, 0]
frequency_matrix: [[0, 1], [0, 0], [0, 0], [1, 0]]
source_frequency: 60
n_frame: 6
tjit: 0.0
moderator:
type: 3
scaling_function: None
measured_wavelength: [28.60141458, 26.65479018, 24.84065387, 23.14998844, 21.57439041, 20.10602826, 18.73760346, 17.46231422, 16.27382172, 15.16621852, 14.13399926, 13.17203328, 12.27553911, 11.44006072, 10.66144534, 9.93582285, 9.25958654, 8.62937515, 8.04205622, 7.49471047, 6.9846173, 6.50924128, 6.06621956, 5.65335009, 5.26858069, 4.90999885, 4.57582225, 4.26438985, 3.97415367, 3.70367109, 3.45159766, 3.21668046, 2.99775183, 2.79372357, 2.60358156, 2.42638069, 2.2612402, 2.10733923, 1.96391283, 1.83024809, 1.70568063, 1.58959128, 1.48140303, 1.38057811, 1.28661538, 1.19904779, 1.11744009, 1.04138664, 0.97050943, 0.90445614]
measured_width: [349.37, 354.02, 358.23, 361.74, 364.36, 365.84, 366.0, 364.71, 361.86, 357.47, 351.6, 344.4, 336.06, 326.81, 316.87, 306.49, 295.86, 285.14, 274.45, 263.89, 253.48, 243.24, 233.12, 223.05, 212.97, 202.77, 192.43, 181.89, 171.24, 160.57, 150.08, 139.97, 130.4, 121.38, 112.68, 103.81, 94.24, 83.71, 72.47, 61.31, 51.03, 42.13, 34.74, 28.75, 23.98, 20.19, 17.17, 14.77, 12.85, 11.29]
parameters: [0.0]
detector:
type: 2
phi: 60.0
depth: 0.025
sample:
type: 2
thickness: 0.01
width: 0.01
height: 0.06
gamma: 0.0
configurations:
chopper_package:
default_option: "High Flux"
High Flux:
choppers: {'Fermi': {'distance': 6.413, 'nslot': 2, 'slot_ang_pos': None, 'slot_width': 20.0, 'guide_width': 2.0, 'radius': 20.0, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper2': {'distance': 7.515, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper3': {'distance': 33.02, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper4': {'distance': 34.785, 'nslot': 1, 'slot_width': 110, 'slot_ang_pos': None, 'guide_width': 12, 'radius': 282.5, 'num_disk': 2, 'is_phase_independent': False, 'default_phase': 0}}
Intermediate:
choppers: {'Fermi': {'distance': 6.413, 'nslot': 2, 'slot_ang_pos': None, 'slot_width': 20.0, 'guide_width': 2.0, 'radius': 20.0, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper2': {'distance': 7.515, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper3': {'distance': 33.02, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper4': {'distance': 34.785, 'nslot': 1, 'slot_width': 32, 'slot_ang_pos': None, 'guide_width': 12, 'radius': 282.5, 'num_disk': 2, 'is_phase_independent': False, 'default_phase': 0}}
High Resolution:
choppers: {'Fermi': {'distance': 6.413, 'nslot': 2, 'slot_ang_pos': None, 'slot_width': 20.0, 'guide_width': 2.0, 'radius': 20.0, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper2': {'distance': 7.515, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper3': {'distance': 33.02, 'nslot': 1, 'slot_width': 61, 'slot_ang_pos': None, 'guide_width': 40, 'radius': 250, 'num_disk': 1, 'is_phase_independent': False, 'default_phase': 0}, 'Chopper4': {'distance': 34.785, 'nslot': 1, 'slot_width': 9.86, 'slot_ang_pos': None, 'guide_width': 12, 'radius': 282.5, 'num_disk': 2, 'is_phase_independent': False, 'default_phase': 0}}
:ref:``