[ Identification | Description | Input parameters | Links ]

The templateTAS Instrument

Template RESCAL type triple-axis machine (TAS)

Identification

• Site: Templates
• Author: Emmanuel Farhi
• Origin: ILL (France)
• Date: 2006

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/

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[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43

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Last Modified: Tuesday, 16-Apr-2024 20:05:22 CEST