Microstructural studies using X-ray diffraction
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ID 06

ID 6 handling

Beamline control

Motors

Press motors

  • Vertical movement: z1, z2, z3, z4
  • Move all z motors: lvpz amount (relative, in mm)
  • horizontal movement, perpendicular to beam: y2

Commands

  • to move a motor (absolute, position in mm): umv motor position
  • to move a motor (relative, amount in mm): umvr motor amount
  • to know where is a motor: wm motor

Detector arm

  • rotation: azim
  • images at azim=90
  • diffraction typically between azim=0 and azim=360

Slits

  • vertical slit: fsvg
  • horizontal slit: fshg
  • slits at 500x500 microns (e.g. diffraction): umv fsvg 0.5; umv fshg 0.5
  • slits at 1x1 mm (e.g. radiographs): umv fsvg 1; umv fshg 1

Take diffraction

The procedure used to be complicated but it was move into a macro. Simply type

take_diff

This is the old procedure (pre-2015)

  • move detector arm to 0
  • close slits to 500x500 microns
  • prepare diffraction software
  • take diffraction in auto save mode:
umv azim 0; eh1fsclose; sleep(1); eh1fsopen; umv azim 360; eh1fsclose
  • take diffraction, manual save mode:
umv azim 0; eh1fsclose; sleep(1); eh1fsopen; umv azim 360; eh1fsclose; eh1fsopen

Diffraction software

  • xview, image height 512, image width 1536
  • choose color scale (click on curve-like icon): typically, between 1000 and 0
  • open setup, control settings, and set it to external trigger
  • choose automatic or manual save and configure it
  • click on camera icon, it will then be triggered by the shutter

To take radiographs

  • move detector arm to 90
  • open slits to 1x1 mm
  • move in z to sample center
  • make sure your ccd menu is ok (option 1 should be YES, option 2 should be YES)
  • type a command like
takephoto 2 -2 9 0.1

This will take 10 images, between 2 and -2 in z. Each image will pose 0.1 s.

Tips and trick

  • Macros are in local/spec/macros when logged in as bliss_adm

Stress directions

With the setup on ID 06, vertical directions are collected at 0 and 180. Horizontal directions are at 90 and 270.

If your sample is under a lateral stress, d-spacings are small at 90 and 270. In this case, 2 theta are large at 90 and 270.

If your sample is under a compressive stress, d-spacings are small at 0 and 180. In this case, 2 theta are large at 0 and 180.

Page last modified on February 19, 2015, at 01:33 PM