# FOCUS motors

## Physical Motors

MTT
  Monochromator two theta. Only readable up to know. Must be moved manually by pushing the detector around.
MSL
  Monochromator shielding lift.
MTH
  Monochromator theta.
MTX
  Monochromator x-translation, vertical to monochromator surface.
MTY
  Monochromator y-translation, parallel to monochromator surface.
MGO
  Monochromator tilting.
M1CH
  Monochromator 1 curvature horizontal.
M1CV
  Monochromator 1 curvature vertical.

## Virtual motors

Virtual motors are instrument parameters which can be driven with the drive and run commands, though they are not physical motors. Mostly this encompasses coordinated movements of motors around several axis or other lengthy and error prone hardware operations.

lambda
  wavelength
ei
  incident energy in meV.
fermispeed
  fermi chopper speed.
diskspeed
  disk chopper speed. This works only when the chopper is NOT in synchonized mode.
phase
  chopper phase difference.
ratio
  This is the ratio fermispeed/diskspeed. A value of two would mean that the diskchopper is running at half the speed of the fermichopper. Please note that the phase is set to 0 automatically while running this command by the chopper controller software from Dornier.