place i used to work made the D2 calibration light sources(lamps) for the spectrometerDid they quadruple the check Grinding Spec’s on the Mirror ?
We don’t need a repeat of the fox paw on Hubble.
Hubble’s Mirror Flaw | NASA
https://www.nasa.gov/content/hubbles-mirror-flaw
Shortly after the Hubble Space Telescope’s launch in 1990, operators discovered that the observatory’s primary mirror had an aberration that affected the clarity of the telescope’s early images. Hubble’s primary mirror was built by what was then called Perkin-Elmer Corporation, in Danbury, Connecticut...
Ultimately the problem was traced to miscalibrated equipment during the mirror’s manufacture. The result was a mirror with an aberration one-50th the thickness of a human hair, in the grinding of the mirror.
place i used to work made the D2 calibration light sources(lamps) for the spectrometerJames Webb Space Telescope has such sensitive infrared capability it could easily detect a bumble bee on the moon. Each one of its 18 hexagonal mirrors have are so precise that if you stretched them out over the surface of the U.S. there would be only 3 inches deviation over its surface. They are made of Beryllium, a metal that is lightweight and strong that will never go out of shape. Each mirror must be aligned with each other to the nano meter. To do that they have computer controlled devices to align each mirror out in space. There is no way its mirror be out of focus like the Hubble.
There is so much that had to be invented for the sensors and other elements of the system, this telescope will be an incredible achievement for science.