[mcstas-users] Radial collimator at primary side
Walz, Erik
Erik.Walz at frm2.tum.de
Tue Aug 17 08:36:22 CEST 2021
Dear All,
We currently are trying to use a radial collimator in front of the
sample (primary side) to achieve a defined gauge volume width at the
sample position. Thus, the collimator is rotated and the neutrons
enter from the opposite side than usual. Unfortunately, results make
no sense at all. If we turn the collimator the other way around as a
test, we see a reasonable image on the detector, so the component
itself seems to be logically defined.
The file is attached below. We would be very grateful about tips or
suggestions to solve the issue for using a radial collimator at the
primary side.
Best regards,
Erik Walz
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# TITLE *Iron-Fe-[IM3-M] Swanson, H.E.;Tatge, E.[1954] [Iron alpha phase]
# CELL 2.886000 2.886000 2.886000 90.000000 90.000000 90.000000
# SPCGRP I M 3 M CUBIC STRUCTURE
# ATOM FE 1 0.000000 0.000000 0.000000
# SCATTERING FACTOR COEFFICIENTS: FE F= 0.945 CM-12
# Reference: Acta Crystallographica (1954) 7, 464-464
#
# Physical parameters:
# sigma_coh 11.22 coherent scattering cross section (single atom) in [barn]
# sigma_inc 0.4 incoherent scattering cross section (single atom) in [barn]
# sigma_abs 2.56 absorption scattering cross section (single atom) in [barn]
# density 7.87 in [g/cm^3]
# weight 55.84 in [g/mol] (single atom)
# multiplicity 2 in [atoms/unit cell]
# Vc 24.04 volume of unit cell in [A^3]
# v_sound 4910 in [m/s]
# v_sound_l 4994 velocity of longitudinal sound in [m/s]
# v_sound_t 2809 velocity of transversal sound in [m/s]
# T_m 1811 melting temperature in [K]
# T_b 3134 boiling temperature in [K]
# At_number 26 atomic number Z
# lattice_a 2.886 lattice parameter a in [Angs]
#
# Format parameters: Lazy format <http://icsd.ill.fr>
# column_j 17 multiplicity 'j'
# column_d 6 d-spacing 'd' in [Angs]
# column_F 13 norm of scattering factor |F| in [barn^0.5]
# column_h 1
# column_k 2
# column_l 3
#
# H K L THETA 2THETA D VALUE 1/D**2 SIN2*1000 H K L INTENSITY /F(HKL)/ A(HKL) B(HKL) PHA.ANG. MULT LPG
1 1 0 14.18 28.37 2.0407 0.2401 60.03 1 1 0 1000.0 1.8 1.78 0.00 0.00 12 17.18
2 0 0 20.27 40.55 1.4430 0.4803 120.06 2 0 0 229.2 1.7 1.68 0.00 0.00 6 8.88
2 1 1 25.11 50.22 1.1782 0.7204 180.09 2 1 1 561.4 1.6 1.58 0.00 0.00 24 6.13
2 2 0 29.34 58.68 1.0204 0.9605 240.13 2 2 0 194.0 1.5 1.49 0.00 0.00 12 4.78
3 1 0 33.22 66.44 0.9126 1.2006 300.16 3 1 0 286.8 1.4 1.40 0.00 0.00 24 3.98
2 2 2 36.88 73.76 0.8331 1.4408 360.19 2 2 2 73.9 1.3 1.32 0.00 0.00 8 3.47
3 2 1 40.41 80.82 0.7713 1.6809 420.22 3 2 1 354.0 1.2 1.24 0.00 0.00 48 3.13
4 0 0 43.87 87.74 0.7215 1.9210 480.25 4 0 0 36.3 1.2 1.17 0.00 0.00 6 2.89
3 3 0 47.31 94.62 0.6802 2.1611 540.28 3 3 0 60.8 1.1 1.10 0.00 0.00 12 2.73
4 1 1 47.31 94.62 0.6802 2.1611 540.28 4 1 1 121.6 1.1 1.10 0.00 0.00 24 2.73
4 2 0 50.79 101.57 0.6453 2.4012 600.31 4 2 0 104.1 1.0 1.04 0.00 0.00 24 2.63
3 3 2 54.35 108.70 0.6153 2.6414 660.34 3 3 2 91.0 1.0 0.98 0.00 0.00 24 2.60
4 2 2 58.08 116.15 0.5891 2.8815 720.38 4 2 2 81.6 0.9 0.92 0.00 0.00 24 2.63
4 3 1 62.06 124.11 0.5660 3.1216 780.41 4 3 1 150.7 0.9 0.87 0.00 0.00 48 2.73
5 1 0 62.06 124.11 0.5660 3.1216 780.41 5 1 0 75.4 0.9 0.87 0.00 0.00 24 2.73
5 2 1 71.61 143.22 0.5269 3.6019 900.47 5 2 1 152.6 0.8 0.77 0.00 0.00 48 3.52
4 4 0 78.54 157.07 0.5102 3.8420 960.50 4 4 0 50.4 0.7 0.72 0.00 0.00 12 5.24
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