Real Time Feedback control with a micro PC system

Sean McSweeney,
Eric Boiguerin, Pascal Theveneau, Mario Lentini, Frank LaPeyre
ESRF / EMBL - Grenoble

 

We describe a system based upon the use of a micro-PC control system which provides fully automatic X-ray beam intensity stabilisation, combined with X-ray beam positional stabilisation. The system uses a quadrent photodiode to mointor the X ray beam and acts upon piezo-electric actuators to control the position of the second crystal of the id14-4 monochromator system. The system is in routine use on id14-4. Future developments of the system will be described.