MAXIMA Optics Documentation and Description

An overview of the MAXIMA optics (photo) is shown in the picture.

A close up of the MAXIMA optics (photo) inside the new dewar is shown in the imbedded picture.

ACS Maxima Optics

Maxima's optical system consists of 3 mirrors. A primary, secondary and tertiary. See attached figure. The optical system was designed during Sept./Oct. 1994 by Shaul Hanany.

Design Parameters:

• Provide diffraction limited perfomance at a wavelength of 3 mm over a focal plane that consists of 8 pixels, each with a 20 arcminute FWHM beam.

• The primary mirror existed before the detailed design of the system.
• The size of the post primary optics had to be reasonably compact - to reduce optical loading on the detectors it was desirable to cool the post primary mirror optics.

Resulting system The resulting system is an f/1.8 three mirror system. The exact parameters of the mirrors can be found in the MAXIMA OPTICS binder. The system meets all the design parameters as outlined above. Detailed performance information can be found in the MAXIMA OPTICS binder.

Mirrors and optics box:

• The primary mirror is made of ....?? it weighs 11 Kg. its emissivity was measured to be ....?? It was purchased from Dornier, Germany for $125,000.
• The secondary and tertiary mirrors are made of light-weighted 6061-T6 Al covered with SiO2 protective coating. They were diamond spinned by Speedring Systems in Michigan.
• the optics box was designed by Paul Richards, and Shaul Hanany, with assistance by Speedring. It was layed out by Speedring and fabricated by the machine shop in Berkeley. After the parts were machined the parts were heat treated by Speedring, the box was assembled with the optics, and the system was test (by Speedring). Results of the tests are the in the MAXIMA OPTICSOPTICS binder.

Shaul Hanany hanany@physics.berkeley.edu The Center for Particle Astrophysics 301 Le Conte Hall, UC Berkeley Berkeley, CA 94720 (510) 642-7802

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