European Southern Observatory New Technology Telescope

General :
Observations :
Operations :

Predefine M1 aberrations

On wt5tcs:

• edit the file /vltdata/EMVIRONMENTS/lt5m1/input/aber.dat and enter the aberrations with the format given in the files. The amplitudes are in nm. Typical values for a nice aberration: 100-500
• send the following commands one after the others, without delay (there is a time out)
  • msgSend lt5m1 nttm1Server FCOR "POLY" [this compute the forces; POLY for the Zernickes, ELA for the elastic modes]
  • msgSend lt5m1 nttm1Server WRITEZD "0.0" [replace 0.0 by the Zenithal Distance (NOTE: *NOT* the altitude)
  • msgSend lt5m1 nttm1Server SERFORC "" [apply the forces] This sequence of commands is ready in ~nttops/bin/nttM1SetAber
• to visualize the result, use the panel ~nttops/bin/m1AberForces
  This is a copy of the m1Forces panels that will show the ABERRATIONS instead of the error of the forces when used in "Differential" mode.
  This panel will work nicely only close to zenith (I'll eventually fix this)
  
• IMPORTANT NOTE:
  • this procedure is additive: the requested aberration is ADDED to the mirror. Run it twice, you get 2x the aberration. If you want to change the aberration, you have first to reset the mirror.
  • avoid sending too large aberrations that would send the actuators to the limit.

Send comments to: NTT Webmasters <nttweb@www.ls.eso.org> Last Update: MMM DD, YYYY (WHO)