IDL cheat sheet

Version 39.1 by fwilde on 2019/04/01 18:23

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Coordinate system

Right-handed coordinate system with y-direction along the x-ray beam.

Sample positioning

Relative movement

IDL command	description	motion
s_stage_x/z, 1	move rotation stage in x/z-direction by 1 mm	relative [ mm ]
s_pos_x/y/z, 1	move sample stage in x/y/z-direction by 1 mm (caution with directions: stage mount on rotation axis)	relative [ mm ]
s_pos_lateral, 1	move sample stage in x-direction by 1 mm, regardless of position of rotation axis	relative [ mm ]
s_angle, 90	rotate sample around z axis	relative [ deg ]

Absolute movement

IDL command	description	motion
goto_s_stage_x/z, 1	move rotation stage in x/z-direction to 1 mm	absolute [ mm ]
goto_s_pos_x/y/z, 1	move sample stage in x/y/z-direction to 1 mm	absolute [ mm ]
goto_s_angle, 90	rotate sample around z axis to 90° (alias command: s_rot)	absolute [ deg ]

Get current position

IDL command	description
pos_s_stage_x/z()	return current rotation stage in x/z position
pos_s_pos_x/y/z()	return current sample stage in x/y/z position
pos_s_angle()	return current rotation stage angle

Predefined positions

IDL command	description
s_in	move sample to "in" position
s_out	move sample to "out" position
s_change	move sample to "change" position
set_s_in_pos, 0	set s_in position to 0.0 mm
set_s_out_dist, 10	set s_out distance to 10.0 mm

Detector positioning

IDL command	description	motion
pressure_on	enable detector y movement
o_ccd_dist, 5	move detector in y direction	relative [ mm ]
pressure_off	disable detector movement

Slit positioning

IDL command	description
slit_eh2, rx=1 (rz=1)	moves eh2 slit aperture horizontally (vertically) by 1mm , works analoguous for slit_oh and slit_ps2
slit_eh2, rdz=1 (rdz=1)	opens eh2 the slit aperture horizontally (vertically) by 1 mm, works analoguous for slit_oh and slit_ps2
slit_info	show all slit positions

rx, rdx, rz and rdz can be concatenated in one command (e.g. slit_oh, rx=1, rz=-2, rdx=0.5, rdz=0.5)

Make images

IDL command	description
i=quick(100) & tv_quick, i & draw_box, [ x1, x2 ,z1 ,z2 ]	make an image & show image & draw box
a=quick_abs(100) & tv_quick, a & draw_box, [ x1, x2 ,z1 ,z2 ]	make an absorption image & show image & draw box
write_tiff, '/gpfs/current/raw/test.tif', i, /SHORT	save i as 16-bit tiff in /gpfs/...

Monochromator positioning

IDL command	description	motion
calc_dcm_energy, 10000, /set	set DCM and undulator to 10 keV
dcm_pitch, 0.00001	move 2nd crystal pitch by 0.00001 deg	relative [ deg ]
goto_dcm_pitch, -0.03976	move 2nd crystal pitch to -0.03976 deg	absolute [ deg ]
reflex_opt	move 2nd crystal pitch to optimal flux position
gap, 0.01	move undulator gap by 0.01 mm	relative [ mm ]

General syntax

Functionality	IDL syntax
Chaining commands	command_1 & command_2 & ...
absolute movement	goto_motor, position
relative movement	motor, position
current motor position	pos_motor()