TOPSI Device list

Motors

BeamStopX: this motor (actually it's a pneumatic drive) controls the vertical movement of the instrument beam stop (shutter). It is a Li-6/Pb sandwich absorber located between the monochromator in the center of the monochromator shielding and the exit of that shielding. I never used this command and maybe it doesn't work because there is no SPS control unit on TOPSI.; Anyway, there is the standard beam shutter control box at the right of the entry door to the experimental area. Any ordinary user should open and close the shutter using that box, only.

Here's an overview of TOPSI with all its standard motors. Although there are many names and ways to address a motor I recommend to use the systematic alias mnemonic. This 3-letter mnemonic uses the first letter to distinguish between monochromator (M__), sample (S__), diaphragms (D__), and motors used for scan modes of the u-shaped multireflection table (U__). Nevertheless, you may use the other aliases in the following list or TASMAD mnemonic, if this appears to be more natural to you. The second and third letter are used to specify the function or the part to be moved, e.g., a rotation of sample or monochromator for an angle theta (_TH), the rotation of a secondary arm (_TT), both around vertical axes, translations (_TX & _TY) and tiltings of goniometers (_GX & _GY) along perpendicular directions, the blade of a diaphragm (_1L, _2R, _3V, etc.).

Mnemonic and Function of Motors

Use Netscape or compatible browser to display this table.

Standard alias mnemonic	TASMAD mnemonic	Motor-# (motor-# on controller #)	Location of motor & digitizer	Function
MTH	A1	1 (1, 2)	in mono drum	rotation of monochromator crystal around vertical axis
MTT	A2	2 (2, 2)	back of mono drum	rotation of platform around vertical monochromator axis
MTY	MTL	5 (5, 2)	on top of motor 1 in mono drum	horizontal translation of monochromator crystal
MTX	MTU	6 (6, 2)	on top of motor 5 in mono drum	horizontal translation of monochromator crystal perpendicular to MTY
MGX	MGL	9 (9, 2)	uppermost in mono drum	rotation of monochromator crystal around horizontal axis to define horizontal scattering plane
STH, TH	A3	3 (3, 2)	2nd lowermost on platform	rotation of sample around vertical axis
STT, TTH	A4	4 (4, 2)	lowermost on platform	rotation of detector arm around vertical sample axis
STY	STL	7 (7, 2)	on top of motor 3 on platform	horizontal translation of sample (thought to be perpendicular to beam, but depends on STH value)
STX	STU	8 (8, 2)	on top of motor 7 on platform	horizontal translation of sample perpendicular to STY (thought to be along the beam, but depends on STH value)
SGY	SGL	11 (11, 2)	2nd uppermost on platform (uppermost when SGX is not mounted)	rotation around a horizontal axis to incline the sample along STY direction
SGX	SGU	12 (12, 2)	uppermost on platform	rotation of sample around an inclined axis (along STX direction if STY=0)
D1R, S1R	MCV	13 (1, 3)	diaphragm 1 (nearest to mono drum)	movement of the right aperture (when looking from the monochromator)
D1L, S1L	S3S	14 (2, 3)	diaphragm 1 (nearest to mono drum)	movement of the left aperture (when looking from the monochromator)
D1V, S1V	ACH	15 (3, 3)	diaphragm 1 (nearest to mono drum)	vertical movement of either the upper or lower aperture (depends on which one is connected)
D2R, S2R	ATL	17 (5, 3)	diaphragm 2	movement of the right aperture (when looking from the monochromator)
D2L, S2L	ATU	18 (6, 3)	diaphragm 2	movement of the left aperture (when looking from the monochromator)
D2V, S2V	AGL	19 (7, 3)	diaphragm 2	vertical movement of either the upper or lower aperture (depends on which one is connected)
D3R, S3R	MCH	21 (9, 3)	diaphragm 3 (nearest to detector)	movement of the right aperture (when looking from the monochromator)
D3L, S3L	ACH	22 (10, 3)	diaphragm 3 (nearest to detector)	movement of the left aperture (when looking from the monochromator)
D3V, S3V	CCH	23 (11, 3)	diaphragm 3 (nearest to detector)	vertical movement of either the upper or lower aperture (depends on which one is connected)
UTY	A5	16 (4, 3)	lowermost on multireflection table	horizontal translation of multireflection yoke (perpendicular to detector arm)
UTZ	A6	20 (8, 3)	uppermost on multireflection table	vertical translation of multireflection yoke (perpendicular to detector arm)
UTT	MGU	24 (12, 3)	between support base and detector arm	fine translation of detector arm
AUX		10 (10, 2)	auxiliary	for additional motors, for instance a vertical translation stage on sample cradle

Counters

There is only one named counter.

Variables

Instrument: holds the name of the Instrument, in SANS case: "SANS at SINQ, PSI". This cannot be changed by ordinary members of the public.
Title: the title of the instrument. This will be written to the output file. Should be set by the user to something sensible.
User: the user of the instrument. This will be written to the output file. Should be set by the user to something sensible.
Comment1: one line of comment to be written to the outputfile. Should be set by the user to something sensible.
Comment2: another line of comment to be written to the outputfile. Should be set by the user to something sensible.
environment: a line of text describing special environment conditions to be written to the output file. This is for those cases where the sample environment is not computer controlled and therefore not visible to the program. Users are responsible for filling this in.; D. Clemens , Last Modified : 4.5.1998