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[ Identification | Description | Examples | Input parameters | Links ]
The SNS_ARCS Instrument
Model of the ARCS spectrometer from SNS.
Identification
- Site: SNS
- Author: G. Granroth
- Origin: SNS
- Date: Nov 2014
Description
When using this ARCS instrument model, please reference
- Granroth, G. E. and Abernathy, D. L., "Performance Comparisons of Four Direct Geometry Spectrometers Planned for Spallation Neutron Source", Proceedings of ICANS-XVI, 289 (2003).
- D. L. Abernathy, M. B. Stone, M. J. Loguillo, M. S. Lucas, O. Delaire, X.Tang, J. Y. Y. Lin, and B. Fultz,"Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source", Review of Scientific Instruments, 83 , 015114 (2012)
Examples
(Test cases in bold)- Test: -y Detector: Full_cyl_I=235445
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default |
| filename | str | Source spectrum file for SNS_source | "source_sct521_bu_17_1.dat" |
| Fermi_nu | Hz | Frequency of the Fermi chopper | 420 |
| T0_nu | Hz | Frequency of the T0 chopper | 90 |
| nrad | m | Radius of the Fermi chopper blades | 0.58 |
| nchans | 1 | Number of channels in the Fermi chopper | 40 |
| Edes | meV | Desired/target energy | 50 |
| Et | meV | Energy transfer of the Spot_sample | 25 |
| ttheta | deg | Scattering angle of the Spot_sample | 25 |
| T0_off | s | Time offset of the T0 chopper (?) - currently only used in output file names | 0 |
| sxmin | m | Sample slit horz min value | -0.04 |
| sxmax | m | Sample slit horz max value | 0.04 |
| symin | m | Sample slit vert min value | -0.04 |
| symax | m | Sample slit vert max value | 0.04 |
| run_num | 1 | Virtual source run number (unused at present) | 1 |
Links
- Source code for
SNS_ARCS.instr.
Granroth, G. E. and Abernathy, D. L., "Performance Comparisons of Four Direct Geometry Spectrometers Planned for Spallation Neutron Source", Proceedings of ICANS-XVI, 289 (2003).
D. L. Abernathy, M. B. Stone, M. J. Loguillo, M. S. Lucas, O. Delaire, X.Tang, J. Y. Y. Lin, and B. Fultz,"Design and operation of the wide angular-range chopper spectrometer ARCS at the Spallation Neutron Source", Review of Scientific Instruments, 83 , 015114 (2012)
[ Identification | Description | Examples | Input parameters | Links ]
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