Alignment

Single

For a single tomography data collection, the python script Adjust fully automates all tomography instrument alignemt taks.

Adjust works in combination with a 0.5 mm tungsten sphere that needs to be installed as a sample on top of the rotary stage making sure is in the field of view at least when the rotation axis is at 0 and 10 degrees.

Adjust’s funtions include automatic finding of:

1. detector pixel size

2. scintillator focus location

3. rotation axis location

4. centering of the sample on the rotation axis

5. rotation axis pitch and roll

First step is to mesaure the image pixel size by running:

user2bmb@pg10ge $ adjust resolution

then:

user2bmb@pg10ge $ adjust focus
user2bmb@pg10ge $ adjust center
user2bmb@pg10ge $ adjust roll
user2bmb@pg10ge $ adjust pitch

Mosaic

For mosaic tomography data collection, the horizonal translation stage (X) needs to precisely align so that during the X translation the sample does not move up or down. This can be accomplished by the following steps :

Sample motor stack

The sample motor stack consists of:

1. Sample top X (horizontal motion above the rotary stage)

2. Sample top Z (horizontal motion normal to “sample top X” above the rotary stage)

3. Sample Y (vertical motion)

4. Sample Swivel Stage (2 axes roll and pitch motion)

5. Sample Y (vertical motion)

6. Sample X (horizontal motion perpendicular to the beam)

Swivel Stages

we have different sets of swivel stages:

Station	Descriptiom	Model	Image	Radius (mm)	Base size (mm)	Angular range (°)	Info
2-BM-A	fast tomo	Kohzu SA16A-RS		220/280	160	±10/±10	box link 0001, order 0003
2-BM-B	mona tomo	Kohzu SA07A-R2L		96/122	70	±10/±8	box link 0001, order 0001 order 0002

Rotary Stages

we have different sets of rotary stages:

Station	Descriptiom	Model	Image	Controller	Speed (rpm)	Load axial (kg)	Info
2-BM	spindle	ABS2000-1000AS-RU		ENSEMBLEHLE10-40-A-MXH (*)	6000	18	box link 0004, box link 0002, order 0004
2-BM-A	fast tomo	ABS250MP-M-AS		ENSEMBLEHLE10-40-A-MXH (*)	500	66	box link 0004, box link 0003, order 0005
2-BM-B	mona tomo	ABRS-150MP-M-AS		ENSEMBLEHLE10-40-A-MXH (*)	500	8	box link 0004, order 0006

(*) replaced with ENSEMBLEML10-40-IO-MXH

Ensemble

The Ensemble Parameter Setup currently in use at 2-BM-A and 2-BM-B stations can found at Ensemble Settings

	ABRS150MP	ABRS250MP	Units
Fundamental Encoder Resolution	3600	11840	lines/rev
Encoder scale factor	148	45
Encoder pulses per revolution	532800	532800	pulses/rev
Encoder resolution	0.000675675675676	0.000675675675676	deg/pulse

PSO

Details on the Position Synchronized Output (PSO) are in the Aerotech Manual