7
ΨPerform a white light flat: to equalise in piston
•Switch on Simplex light, Iris = -150
•Set WFS Integration Time to 25ms or 50ms
•Spots have to be bright enough for the algorithm to converge
•From the General Scripts window do an Autocentre
•Check focus; the spots separation has to be close to 8 pixels. Adjust the WFS fore-optics focus from the EPICS guis
•Type AutoWhite from Navis prompt
•Answer 0 (leave alone) to the question about Integration Time 
•The process takes more than 5 min; the X-shifted and Y-shifted lenslet
•Note the result: the algorithm gives satisfactory result if:
•There are more than 120 measurements
•X and Y gradients are less than 200 in absolute value
•For specialists: If Gradients are high, take out a global tip (X) or tilt (Y) with AddZernike tip –(gradient/100) then the return flat will need adjusting in Grace, and a new Laser/White light flat
•After Laser Flat and White light Flat, don’t forget to restore air flow to >80% in Grace.
•   
Ψ
Ψ
Ψ
Ψ
Ψ
Ψ
Ψ
q
q
q
Ψ
Ψ
q
q
DE checks of NAOMI