July 26, 2006
ALMA Pointing
4
Major Antenna Performance Specifications
15/20 mm (non-repeatable/repeatable)
Path Length Stability
1.5 degree move in 1.5 seconds; settle to 3 arcsec peak pointing error
Fast Switching
0.6 arcsec over 2 degree radius
Offset Pointing
2 arcsec all-sky
Absolute Pointing
25 mm RMS (20 mm goal)
Surface Accuracy
Specification
Property
Primary Operating Conditions:
¥ -20 C £ Tamb £ +20 C
¥ DTamb £ 0.6/1.8 C in 10/30 min
¥ Vwind £ 6/9 m/s (day/night)
¥ Full solar loading