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BM02 - D2AM French CRG Beamline
 

D2am Handbook

last modified 09-06-2011 15:59
Status - Operational since 1994

Scientists in charge

 

 

Beamline and
7-circle diffractometer
 Nathalie Boudet
Institut Néel - MCMF

Jean-François Bérar
Institut Néel - MCMF
 d2am : (+33)4 76 88 25 94
    fax : (+33)4 76 88 23 25

d2am : (+33)4 76 88 25 96
Small Angle Scattering
Camera:		 soft condensed matter
C. Rochas
CERMAV		 +(33)4 76 03 76 77
fax : (+33)4 76 54 72 03
hard condensed matter
Fréderic De Geuser
SIMAP		 (+33)4 76 82 66 12
fax : (+33)4 76 82 66 44
GiSaxs
Mireille Maret
SIMAP		 (+33)4 76 82 66 86
fax : (+33)4 76 82 66 44

 


Description of the D2AM optics

The optics has quite a symmetrical design and consists of a two crystal monochromator with sagittal focusing (mainly Si(111) but Si(311) is available) located between two cylindrically bent mirrors in a compact arrangement, with double focusing (3:1).

  1. Point focusing of the beam on the crystal at fixed sample position; less than 0.3x0.3 mm2 can be reached at sample position
  2. High energy resolution: 2-5 eV; DE/E~ 2.10-4
  3. High Q resolution; DQ/Q~ 10-3 - 10-4
  4. Accessible wavelength range: 0.5-2.5 Å, i.e. about 25-5 keV;
  5. High rate of harmonic rejection: higher than 10-4.
  6. With focusing typical angular divergences are 3.10-4*3.10-3rd^2 (vertical*horizontal) for a beam size of 3*30mm2 on the monochromator.



The main distances between optical elements are :

  • source - primary mirror : 26.055 m
  • source - monochromator (1st crystal) : 28.027 m
  • source - second mirror : 29.763 m
  • monochromator - goniometer centre : 9.517 m
  • The beamline slits are located at 24.470m, 31.470m, 35.295m from the source.
  • source - SAXS slits : 40.745 m
For an exhaustive beamline description, refer to JL Ferrer et al., J Synchrotron Rad. (1998) p1346-1356.


Instruments

Small angle camera:

A modular Small Angle Scattering camera with different sample changers and camera lengths, with three options:

  • very small angle (q > 6.10-4 Å-1 at 8keV) with high position stability; mandatory collaboration with the local contact.
  • regular SAXS for soft condensed matter, with possibility to insert sample holders for time-resolved experiments (3.5 10-3 Å-1<  q  < 0.3 Å-1)
  • Anomalous SAXS (recommended collaboration) (10-2 Å-1< q < 1Å-1)
For complementary informations, refer to JP Simon et al., J. Appl. Cryst. (1997) p900-904.

"7 circle" diffractometer:

The diffractometer for Materials Science has the following geometry: three Eulerian circles for sample orientation including the open, off-centered CHI circle (-10°, +100°) to adapt sample environment. For the detection, vertical rotation axis ALPHA and horizontal axis 2THETA (-5°, + 130°) carrying an optional vertical analyser. All the angular motions have a resolution lower than 0.001°, the confusion sphere being smaller than 0.05 mm. Using a Si (311) analyser, FWHM less than 0.02° (2THETA) should be reached with powder samples.

Various sample environments are available.
 
European Synchrotron Radiation Facility