Difference between revisions of "Specification for goniometer mount for radiators"

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The planned Hall-D goniometer is a 6-axis device with 3 translational and 3 rotational degrees of freedom:
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 +
Short description of the stages (from bottom to radiator mount):
 +
* horizontal translational stage (x-stage) to move the into/out-of beam (range ~20 cm)
 +
* vertical translational stage (y-stage) to adjust the height of the radiator (range ~5 cm)
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* rotation about the vertical axis (yaw) to ±15 deg.
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* rotation about the horizontal, perpendicular to the beam direction (pitch) to ±15 deg.
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* craddle: rotation about the beam direction (roll) to +120 deg. and -30 deg.
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* horizontal translational stage (target ladder), positioned in the center of the craddle and range of ≥ 8 cm (space for mounts of 5 diamonds and thin foil for normalization run).
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The listed accuracy is based on the existing Huber goniometer in Hall B.
 
* accuracy of translational motion:
 
* accuracy of translational motion:
−
       vertical:                    200 um
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       vertical:                    200 μm
−
       horizontal (bottom axis):    200 um
+
       horizontal (bottom axis):    200 μm
−
       target ladder (fine tuning):  25 um
+
       target ladder (fine tuning):  25 μm
  
 
* accuracy of rotational motion:
 
* accuracy of rotational motion:
−
       yaw (about vert.axis):                  1.0 urad
+
       yaw (about vert.axis):                  1.5 μrad
−
       pitch (about horizontal, perp. to beam): 1.0 urad
+
       pitch (about horizontal, perp. to beam): 1.5 μrad
−
       roll (about beam direction):            1.5 urad
+
       roll (about beam direction):            3.0 μrad
  
 
End switches required for all axes, additional home switches for rotations.
 
End switches required for all axes, additional home switches for rotations.
  
−
Target ladder is positioned in the center of the craddle (roll)
+
The device is operated under vacuum (~10<sup>-6</sup>).
−
and should move over 8 cm (space for mounts of 5 diamonds and thin foil for normalization run).
+
 
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[[Image:gonisketch2.jpg]]

Latest revision as of 10:23, 23 October 2008

The planned Hall-D goniometer is a 6-axis device with 3 translational and 3 rotational degrees of freedom:

Short description of the stages (from bottom to radiator mount):

  • horizontal translational stage (x-stage) to move the into/out-of beam (range ~20 cm)
  • vertical translational stage (y-stage) to adjust the height of the radiator (range ~5 cm)
  • rotation about the vertical axis (yaw) to ±15 deg.
  • rotation about the horizontal, perpendicular to the beam direction (pitch) to ±15 deg.
  • craddle: rotation about the beam direction (roll) to +120 deg. and -30 deg.
  • horizontal translational stage (target ladder), positioned in the center of the craddle and range of ≥ 8 cm (space for mounts of 5 diamonds and thin foil for normalization run).

The listed accuracy is based on the existing Huber goniometer in Hall B.

  • accuracy of translational motion:
      vertical:                     200 μm
      horizontal (bottom axis):     200 μm
      target ladder (fine tuning):   25 μm
  • accuracy of rotational motion:
      yaw (about vert.axis):                   1.5 μrad
      pitch (about horizontal, perp. to beam): 1.5 μrad
      roll (about beam direction):             3.0 μrad

End switches required for all axes, additional home switches for rotations.

The device is operated under vacuum (~10-6).

Gonisketch2.jpg

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