5. Input data

5.1. Input parameters
 5.1.1. List of input parameters
5.2. Data format
 5.2.1. ILL data format
 5.2.2. 3-column format
5.3. TAS configuration file
 5.3.1. Configuration file format
 5.3.2. Collimator components

5.1. Input parameters

(*.res files)

The basic set of TAS parameters is compatible, apart of some extensions, with the older program RESCAL. These parameters are entered interactively from the command line or loaded via the FILE command from a *.res file (an ASCII file containing a sequence of real numbers) or from the header of an ILL data file.

To modify a value, use the syntax

ResTrax> name value [value …]

Several parameter values can be modified simultaneously in the sequence as they appear in the list. For example

ResTrax> QH 2 2 0.5 12

would set all the QH, QK, QL and EN values.

The list of actual values can be obtained by the LIST command:

ResTrax> LIST
DM = 3.13500  DA = 3.13500
ETAM = .00  ETAA = .00  ETAS = .01
SM = -1.  SS = 1.  SA = -1.
KFIX = 4.47753   FX = 2.
ALF1 = 500.00  ALF2 = 500.00  ALF3 = 500.00  ALF4 = 500.00
BET1 = .00   BET2= .00  BET3 = .00   BET4 = .00
AS = 5.6576   BS = 5.6576   CS = 5.6576
AA = 90.0000  BB = 90.0000  CC = 90.0000
AX = -1.0000  AY = -1.0000  AZ = .0000
BX = .0000   BY = .0000  BZ = -1.0000
QH = -.2500  QK = -.2500  QL = 4.0000 EN = 8.2800 DA3 = 0.0000 DA4 = 0.0000
DH = .0100   DK = .0100  DL = .0000  DE = .0000
GH = 1.0000  GK = 1.0000  GL = .0000  GMOD = -19.0000
ROMH = .090  ROMV = 1.500 ROAH = .190  ROAV = 3.2000
SDI = 1.00  SHI = 2.00


5.1.1. List of input parameters

 
variable
description
units
DM,DAdhkl  of the monochromator and analyzer 
Å
ETAM,ETAA,ETASmosaic widths (fwhm) of monochromator, analyzer and sample
min.
SM,SS,SAsigns of scattering angles for monochromator, analyzer and sample
[-1,+1]
KFIX,FXfixed neutron wave-vector; FX=1 fixed ki; FX=2 fixed kf
Å
ALF1 .. ALF4divergence (horizontal) of the soller collimators
=0 no collimator, ≥500 coarse collimator (no lamellae)
min.
BET1 .. BET4the same  for vertical divergence
min.
AS,BS,CSsample unit cell parameters 
Å
AA,BB,CCsample unit cell angles 
deg.
AX,AY,AZ
BX,BY,BZ
[hkl] components of two vectors defining the scattering plane (should be perpendicular for correct representation of some plots)
rlu
QH,QK,QL,ENcurrent TAS setting in (Q,&omega) space, corresponds to the scan center
rlu, meV
DH,DK,DL,DEscan increments in (Q,&omega)
rlu, meV
DA3,DA4step of a scan in a3 (sample rotation) and a4 (scattering anngle); DA4 should be non-zero only in the flat-cone analyzer mode, where it defines the angle between analyzer channels
deg
GH,GK,GL,GMODcomponents of the gradient of the dispersion surface and its module 
rlu,  meV/rlu
ROMH,ROMVmonochromator curvatures (1/radius), horizontal and vertical
m-1
ROAH,ROAVanalyzer curvatures (1/radius), horizontal and vertical
m-1
SDI,SHIsample diameter and height (cylindrical shape is assumed)
cm

rlu … reciprocal lattice units