From January 2013 a new 6-circle HUBER diffractometer is available at the first experimental hutch of P10 beamline.

General aspects

All the technical details concerning the diffractometer can be found visiting the following link of HUBER web-site:

http://www.xhuber.de/1853--~en~Products~diffractometers~xray~single_crystal~5021~5021.html



Circles movements

In principle the whole Ewald’s sphere of a single crystal can be investigated moving the motors corresponding to the 6-circles of the diffractometer.

In order to work with the Tango diffractometer server an alias name has been assigned to each rotation motor as indicated in the following table:


nAliassMotor nameNoteHL switchesSL switchesHome position
1del (2theta_v)  δe1_mot66(+) left-5º : +160º-5º : 100º1.19
2gam (2theta_h) γe1_mot65(+)-20º : +160º-19.5º : +159.5º0.856
3om (theta_v)       ωe1_mot54(+) left-11.6º : +180º-11º : +180º0
4mu (theta_h)μe1_mot56(+) -26º : +26º0
5chiζe1_mot57(+)-60.06 : +171º-60 : +171º90
6phiφe1_mot63(-)(o) left ±180º 


Additional info:

  1. The chi axis is positioned at 90 degree in its normal resting position.
  2. The axes "del",  "om" and "phi" have the same rotation sense and share a common rotation axis for theta_h = 0.0 and chi = 0.0 !


Scheme:

 image2017-11-7_22-44-44.png


Diffractometer-table movements

To move the whole diffractometer table, several orthogonal translational and rotational motors are available:


Alias

Motor name

Note

Travel range

diffy

E1_mot49

(+)

±50 mm

diffz1

E1_mot50

(+)(o)

±25 mm

diffz2

E1_mot51

(-)(o)

±25 mm

diffz

Virtual motor

(vm44)

±25 mm

diffry

Not assigned yet

(vmXX to be defined)



Cryostat movements

A liquid-Helium cryostat will be available in sharing with the beamline P09 that is equipped with same diffractometer. It is possible to move sample in cryostat using the following motors:

Alias

Motor name

Note

Min soft limit

Max soft limit

cryox

E1_mot61

(+)

-4,5

4

cryoy

E1_mot58

(+)

-5

3.5

cryoz

E1_mot62

(+)

-3.4

2.6


Cryo-motors: encoders limits test:

Motor

Neg. Limit actual

Neg. limit encoder

Home

Pos. Limit actual

Pos. limit encoder

Cryo-X

-7,000

-4,707

0

7,000

5,248

Cryo-Y

-7,000

-5,346

0

7,000

4,614

Cryo-Z

-3,400

-3,950

0

2,600

2,597


AFM stage

Motor

AliasTravel rangeZMX 
X-translationafmx±12 mme1.59
Y-translationafmy±12 mme1.60
Z-translationafmz15 mme1.55


Tomo stage

Motor

AliasTravel rangeZMX 
X-translationtomox±11 mme1.45
Y-translationtomoy±11 mme1.46
Rx-tilttomorx±18°e1.47
Ry-tilttomory±18°not connected



Legend of used symbols

Symbol

Meaning

(+)

Encoder

(-)

Without encoder

(o)

Zero-point control

left

left-handed axis (example: for a positive motion of the 2theta_v arm, the arm goes up)

Single Crystal Diffraction procedures

To have a theoretical reference about orientation matrix and peak search routines please give a look to the paper by You (H. You, J. Appl. Cryst. (1999), 32, 614-623) at the following link:

http://journals.iucr.org/j/issues/1999/04/00/hn0093/hn0093.pdf

Our 6-circle diffractometer is similar to the diffractometer described there but the naming of the axes is slightly different.

It follows this translation table:

H. YouP10Alias
PhiPhiPhi
ChiChiChi
EtaOmegath_v
DeltaDelta2th_v
MuMuth_h
NuGamma2th_h


Diffraction MATLAB software package available at:

/beamline/scripts/matlab/tools/diffractometer_tools


image2017-11-2_0-51-35.png


Test of the collisions on 2019.05.28. 

1) Omega motor: Collision with the top microscope - pinhole: 21.5

2) Omega motor: Collision with the inline microscope - 45 

3) Del - Omega = - 36: Collision with the flight tube with the cryo-stage


List of pages related to the P10-diffractometer setup