# The `Test_NMO` Instrument *McStas: Implements a test instrument for the component FlatEllipse_finite_mirror.* ## Identification - **Site:** Tests_optics - **Author:** Christoph Herb, TUM - **Origin:** TUM - **Date:** 2022-2023 ## Description ```text Implements a test instrument for the component FlatEllipse_finite_mirror, implementing Nested Mirror Optic (NMO) as suggested by Böni et al. ``` ## Input parameters Parameters in **boldface** are required; the others are optional. | Name | Unit | Description | Default | |------|------|-------------|---------| | det_width | m | Detector width | 0.218 | | source_width | m | Source width | 0.03 | | source_height | m | Source height | 0.00000001 | | lam_source | AA | Central source wavelength | 5 | | dL | AA | Source wavelength spread | 0.5 | | v_divergence | deg | Source vertical divergence | 2.5 | | h_divergence | deg | Source horizontal divergence | 0.000001 | | b0 | m | Parameter r0 of mirrors (distance to the mirror at lStart) | 0.2076 | | mf | 1 | M-value of the inner side of the coating | 100 | | mb | 1 | M-value of the outer side of the coating | 0 | | mirror_width | m | Width of mirrors | 0 | | focal_length | m | Mirror focal-length | 6 | | mirrors | 1 | Number of NMO mirrors | 29 | | mirror_sidelength | m | Side-length of mirrors | 0.1 | | lStart | m | Parameter lStart of the mirrors | -0.6 | | lEnd | m | Parameter lEnd of the mirrors | 0.6 | | pixels | 1 | Number of detector pixels | 100 | | flux | n/s/cm^2/st/AA | Source flux | 1 | | det_width_focus | m | Detector width at focusing pt. | 0.03 | | rs_at_zero_str | str | Filename to specify mirror rfront_inner_file (e.g. "rs_at_lstart.txt") | "NULL" | | activate_mirror | 1 | Flag to activate mirror | 1 | ## Links - [Source code](Test_NMO.instr) for `Test_NMO.instr`. - P Böni presentation at PSI NFO workshop - Christoph Herb et al., Nucl. Instrum. Meth. A 1040, 1671564 (1-18) 2022. ---