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A Novel X-Ray Position Detector and Implementation in a Mirror Pointing Servo System


Stanford Reference:

13-104


Abstract


The continued evolution to lower emittance synchrotrons and smaller beam size places greater demands on X-ray beam position stability at the experimental stations. Stability in synchrotron beams at the focus is critical for reliable data collection. SLAC researchers have discovered a sensitive X-ray position detector which can be used in a feed-back loop with mirror optics to provide beam position stability at the micron level from time periods of 10Hz to diurnal time frames. It can operate in the hard X-ray range and be used where X-ray energies are scanned. It can be used with beam sizes from a couple hundred microns to tens of microns. Stanford Synchrotron Radiation Laboratory (SSRL) has rolled this detector successfully to a dozen beam lines.


Figure 1 - a Mirror Pitch Feedback Detector in use at BL7-2.


Figure 2 - the detector disassembled so the inside can be seen.


Applications


  • The detector is used in a servo control system to keep an X-ray beam position constant.

Advantages


  • Provides sensitivities in sensing position to the sub-micro level.
  • The detector is always in the X-ray beam without much attenuation to the x-ray beam, where the x-ray beam passes through the detector without much absorption.
  • The detector does not drift significantly with different x-ray energy (tested 6KeV to 20KeV).

Innovators & Portfolio


  • Thomas Rabedeau   
  • Peter Stefan   
  • Douglas Van Campen   

Patent Status



Date Released

 9/6/2013
 

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optical sensors   sensors   X-ray sensors   13-104   
 

   

  

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