POLDI motors

Physical Motors

D1HL

2-axis diaphragm - horizontal translation (left)

D1HR

2-axis diaphragm - horizontal translation (right)

D2HL

4-axis diaphragma - horizontal translation (left)

D2HR

4-axis diaphragma - horizontal translation (right)

D2VU

4-axis diaphragma - vertical translation (upper side)

D2VL

4-axis diaphragma - vertical translation (lower side)

SHU

sample table x-translation

SHL

sample table y-translation

SV

sample table z-translation

SA

sample table rotation

SGU

sample goniometer rotation (alpha)

SGL

sample goniometer rotation (beta)

RSU

sample table overlay for radioactive samples (x-translation)

RSL

sample table overlay for radioactive samples (y-translation)

RSA

sample table overlay for radioactive samples (rotation)

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.

flightpathlength

distance between chopper and detector [in mm]

chopper_sample

distance between chopper and sample [in mm]

chopper_dia

distance between chopper and 2-axis diaphragma [in mm]

dia1_dia2

distance between 2-axis diaphragma and 4-axis diaphragma [in mm]

dia2_sample

distance between 4-axis diaphragma and sample position [in mm]

detectordist

distance between sample position and detector [in mm]

chopperspeed

disk chopper speed

twotheta

scattering angle to the middle of the detector

x0_det

centre of the detector circle (x-coordinate)

y0_det

centre of the detector circle (y-coordinate)

nodet

number of detector cells (400 really cells exist)

det_size

size of a single detector cell [in mm]

det400

automatic configuration of the histogram memory to 400 detectors with a cell size of 2.5 mm

det800

automatic configuration of the histogram memory to 800 detectors (including 400 virtual detectors) with a cell size of 1.25 mm