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McStas: templateTAS Instrument at Templates

[ Identification | Description | Input parameters | Output parameters | Links ]

The templateTAS Instrument

Template RESCAL type triple-axis machine (TAS)

Identification

Description

This instrument is a simple model of triple-axis spectrometer.
It is directly illuminated by the moderator,
and has curved monochromator and analyzer.
Sample can be specified as a powder, liquid/amorphous or a pure incoherent
scatterer (e.g. vanadium, which is the default).
Sample geometry can be spherical or cylindrical.
For PG002 monochromator/analyzer setting, a reflectivity curve vs. wavelength
is used, else reflectivity is set to 70 %. To suppress collimators, set their
divergence to 0 (ALFn BETn).
Default instrument geometry is from IN20@ILL with PG monochromator/analyzer.

Monochromator lattice parameter
PG       002 DM=3.355 AA (Highly Oriented Pyrolythic Graphite)
PG       004 DM=1.607 AA
Heusler  111 DM=3.362 AA (Cu2MnAl)
CoFe         DM=1.771 AA (Co0.92Fe0.08)
Ge       111 DM=3.266 AA
Ge       311 DM=1.714 AA
Ge       511 DM=1.089 AA
Ge       533 DM=0.863 AA
Si       111 DM=3.135 AA
Cu       111 DM=2.087 AA
Cu       002 DM=1.807 AA
Cu       220 DM=1.278 AA
Cu       111 DM=2.095 AA

IN22 configuration (at H25 thermal m=2 guide end):
    KI=3.84, QM=1.0, EN=0.0, verbose=1,
    WM=0.15, HM=0.12,    NHM=1, NVM=9, RMV=-1,
    WA=0.20, HA=0.10,  NHA=11, NVA=3, RAV=-1, RAH=-1,
    SM=-1, SS=1, SA=-1,
    L1=10.0, L2=1.7, L3=1.0, L4=0.8

IN8 Configuration: with Copper optics
    KF=5, KI=0, QM=0.5, EN=5, verbose=1
    WM=0.23, HM=0.19, RMH=-1, RMV=-1, DM=1.807, NHM=15, NVM=15,
    WA=0.16, HA=0.08, RAH=-1, RAV=-1, DA=2.087, NHA=15, NVA=15,
    L1=2.33


Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
KI Angs-1 Incoming neutron wavevector 2.662
KF Angs-1 Outgoing neutron wavevector 0
EI meV Incoming neutron energy 0
EF meV Outgoing neutron energy 0
QH rlu Measurement QH position in crystal 0
QK rlu Measurement QK position in crystal 0
QL rlu Measurement QL position in crystal 0
EN meV Energy transfer in crystal 0
QM Angs-1 Wavevector transfer in crystal 0
KFIX Angs-1 Fixed KI or KF value for Rescal compatibility 0
FX 1:KI,2:KF Fixed KI or KF type for Rescal compatibility 0
L1 m Source-Monochromator distance. Contains 1st Collimator of length 5.34 9
L2 m Monochromator-Sample distance. Contains 2nd Collimator of length 0.35 2.1
L3 m Sample-Analyzer distance. Contains 3rd Collimator of length 0.40 1.5
L4 m Analyzer-detector distance. Contains 4th Collimator of length 0.24 0.7
SM 1:left, -1:right Scattering sense of beam from Monochromator 1
SS 1:left, -1:right Scattering sense of beam from Sample -1
SA 1:left, -1:right Scattering sense of beam from Analyzer 1
DM Angs Monochromator d-spacing 3.3539
DA Angs Analyzer d-spacing 3.3539
RMV m Monochromator vertical curvature, 0 for flat, -1 for automatic setting -1
RMH m Monochromator horizontal curvature, 0 for flat, -1 for automatic setting 0
RAV m Analyzer vertical curvature, 0 for flat, -1 for automatic setting 0
RAH m Analyzer horizontal curvature, 0 for flat, -1 for automatic setting -1
ETAM arc min Monochromator mosaic 30
ETAA arc min Analyzer mosaic 30
ALF1 arc min Horizontal collimation from Source to Monochromator 60
ALF2 arc min Horizontal collimation from Monochromator to Sample A 60
ALF3 arc min Horizontal collimation from Sample to Analyzer 60
ALF4 arc min Horizontal collimation from Analyzer to Detector 60
BET1 arc min Vertical collimation from Source to Monochromator 120
BET2 arc min Vertical collimation from Monochromator to Sample A 120
BET3 arc min Vertical collimation from Sample to Analyzer 120
BET4 arc min Vertical collimation from Analyzer to Detector 120
AS Angs Sample lattice parameter A 6.28
BS Angs Sample lattice parameter B 6.28
CS Angs Sample lattice parameter C 6.28
AA deg Angle between lattice vectors B,C 90
BB deg Angle between lattice vectors C,A 90
CC deg Angle between lattice vectors A,B 90
AX rlu First reciprocal lattice vector in scattering plane, X 1
AY rlu First reciprocal lattice vector in scattering plane, Y 0
AZ rlu First reciprocal lattice vector in scattering plane, Z 0
BX rlu Second reciprocal lattice vector in scattering plane, X 0
BY rlu Second reciprocal lattice vector in scattering plane, Y 1
BZ rlu Second reciprocal lattice vector in scattering plane, Z 0
verbose 1 print TAS configuration. 0 to be quiet 1
A1 deg Monohromator rotation angle 0
A2 deg Monohromator take-off angle 0
A3 deg Sample rotation angle 0
A4 deg Sample take-off angle 0
A5 deg Analyzer rotation angle 0
A6 deg Analyzer take-off angle 0
NHM 1 Number of horizontal slabs composing the monochromator 1
NVM 1 Number of vertical slabs composing the monochromator 9
WM m Width of monochromator 0.10
HM m Height of monochromator 0.12
NHA 1 Number of horizontal slabs composing the analyzer 9
NVA 1 Number of vertical slabs composing the analyzer 1
WA m Width of analyzer 0.10
HA m Height of analyzer 0.12
Sqw_coh str sample coherent S(q,w) file name. Use LAZ/LAU or SQW file "NULL"
Sqw_inc str sample incoherent S(q,w) file name. Use NULL to scatter incoherently "NULL"
radius m outer radius of sample hollow cylinder/sphere 0.01
thickness m thickness of sample hollow cylinder. 0 for bulk 0.005
height m sample height. Use 0 for a spherical shape 0.05

Links

  • Source code for templateTAS.instr.
  • Rescal for Matlab at http://www.ill.eu/instruments-support/computing-for-science/cs-software/all-software/matlab-ill/
  • Restrax at http://omega.ujf.cas.cz/restrax/

[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon Jun 26 12:27:17 2017


Last Modified: Monday, 26-Jun-2017 14:27:17 CEST
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