# 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

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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.

SINQ Home Page TOPSI User Manual Home Page

  D. Clemens , Last Modified : 4.5.1998