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:
| n | Alias | s | Motor name | Note | HL switches | SL switches | Home position |
|---|---|---|---|---|---|---|---|
| 1 | del (2theta_v) | δ | e1_mot66 | (+) left | -5º : +160º | -5º : 100º | 1.19 |
| 2 | gam (2theta_h) | γ | e1_mot65 | (+) | -20º : +160º | -19.5º : +159.5º | 0.856 |
| 3 | om (theta_v) | ω | e1_mot54 | (+) left | -11.6º : +180º | -11º : +180º | 0 |
| 4 | mu (theta_h) | μ | e1_mot56 | (+) | -26º : +26º | 0 | |
| 5 | chi | ζ | e1_mot57 | (+) | -60.06 : +171º | -60 : +171º | 90 |
| 6 | phi | φ | e1_mot63 | (-)(o) left | ±180º |
Additional info:
- The chi axis is positioned at 90 degree in its normal resting position.
- 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:
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 | Alias | Travel range | ZMX |
|---|---|---|---|
| X-translation | afmx | ±12 mm | e1.59 |
| Y-translation | afmy | ±12 mm | e1.60 |
| Z-translation | afmz | 15 mm | e1.55 |
Tomo stage
Motor | Alias | Travel range | ZMX |
|---|---|---|---|
| X-translation | tomox | ±11 mm | e1.45 |
| Y-translation | tomoy | ±11 mm | e1.46 |
| Rx-tilt | tomorx | ±18° | e1.47 |
| Ry-tilt | tomory | ±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. You | P10 | Alias |
|---|---|---|
| Phi | Phi | Phi |
| Chi | Chi | Chi |
| Eta | Omega | th_v |
| Delta | Delta | 2th_v |
| Mu | Mu | th_h |
| Nu | Gamma | 2th_h |
Diffraction MATLAB software package available at:
/beamline/scripts/matlab/tools/diffractometer_tools
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
-
Prepare data (FS-P10)
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Side view camera (FS-P10)
-
Bragg CDI data processing (FS-P10)
-
Diffractometer HKL library (FS-P10)
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Diffractometer sample-table (FS-P10)
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Bragg CDI at 6-circle setup (FS-P10)
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PHASOR 3D (FS-P10)
-
TODO list (FS-P10)
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Hexapod & CRLs (FS-P10)
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6-circle Diffractometer (FS-P10)
-