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- First commit of the new UB based TAS calculation. A milestone has been

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reached: it handles one test case correctly back and forth
- Fixed oscillation code
- Added a feature for switching off automatic updates in nxupdate
  Autoamtic updates cause problems when scanning...
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koennecke
2005-04-22 14:07:06 +00:00
parent 288c65e0bb
commit 6387994017
17 changed files with 1897 additions and 34 deletions
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\subsection{Triple Axis Spectrometer UB Matrix Calculations}
This module handles the calculations typical for a triple axis spectrometer.
This is the calculation in Q energy space. The algorithm useid is based on
a UB matrix calculus as described by Mark Lumsden. This uses the goniometer
tilt angles, sgu and sgl, to position the reflection. For more information,
see the pdf file holding M. Lumsden's text. The actual calculation has been
put into a library, tasublib.h and tasublib.c. This describes the interface to
the SICS interpreter. This module caters for:
\begin{itemize}
\item UB matrix calculations
\item Angle calculations
\item The triple axis modes and logic
\item Introduces the QE variables as virtual motors into SICS
\end{itemize}
A data structure:
@d tasubdat @{
/*------------------- defines for tasMode -----------------------------------*/
#define KICONST 1
#define KFCONST 2
/*-----------------------------------------------------------------------------*/
typedef struct{
pObjectDescriptor pDes;
tasMachine machine;
int reflectionList;
lattice cell;
tasQEPosition target;
tasQEPosition current;
int tasMode;
double targetEn, actualEn;
int mustRecalculate;
int mustDrive;
pMotor motors[12];
}tasUB, *ptasUB;
@}
\begin{description}
\item[pDes] The traditional object descriptor
\item[machine] The machine parameters: monochromator d spacing, scattering sense,
UB and the like.
\item[reflectionList] A list of reflections.
\item[cell] The cell constants.
\item[target] The Q energy target position
\item[current] The actual Q energy position as calculated from angles.
\item[tasMode] The mode: constant KI or constant KF
\item[ptargetEn] The target energy transfer.
\item[actualEn] The actual energy transfer as calcluated from angles.
\item[mustRecalculate] A flag indicatin that the current Q energy psoition has to be
recalculated.
\item[mustDrive] A flag indicating that one of the values has changed and that we need
to drive motors to get in sync again.
\item[motors] The TAS motors: A1, A2, MCV (vertical curvature), MCH (horizontal curvature),
A3, A4, SGU, SGL, A5, A6, ACV, ACH. The curvature motors may be NULL at
runtime.
\end{description}
For the virtual motors, there must be a data structure, too:
@d tasubmotdat @{
/*----------------------- defines for virtual motors -----------------------------*/
#define EI 1
#define KI 2
#define QH 3
#define QK 4
#define QL 5
#define EF 6
#define KF 7
#define EN 8
#define QM 9
/*--------------------- the tas virtual motor data structure ---------------------*/
typedef struct {
pObjectDescriptor pDes;
pIDrivable pDriv;
ptasUB math;
int code;
}tasMot, *ptasMot;
@}
\begin{description}
\item[pDes] The traditional SICS object descriptor.
\item[pDriv] The drivable interface.
\item[math] The tasUB module which does the hard work.
\item[code] The type code: one of the defines from EI to QM given above.
\end{description}
In terms of an interface, there is only the interpreter interface, and of
course the virtual motors within SICS:
@d tasubint @{
int TasUBFactory(SConnection *pCon,SicsInterp *pSics, void *pData,
int argc, char *argv[]);
int TasUBWrapper(SConnection *pCon,SicsInterp *pSics, void *pData,
int argc, char *argv[]);
int TasMot(SConnection *pCon,SicsInterp *pSics, void *pData,
int argc, char *argv[]);
@}
@o tasub.h @{
/*----------------------------------------------------------------------
SICS interface to the triple axis spectrometer calculation
module.
copyright: see file COPYRIGHT
Mark Koennecke, April-May 2005
----------------------------------------------------------------------*/
#ifndef TASUB
#define TASUB
#include <stdio.h>
#include "tasublib.h"
#include "cell.h"
#include "motor.h"
@<tasubdat@>
@<tasubmotdat@>
/*--------------------------------------------------------------------*/
@<tasubint@>
#endif
@}