ATST Telescope Design

Boulder18 March 2009

The Advanced Technology Solar Telescope

Top Level WBS

1.0 Telescope Assembly 2.0 Wavefront Correction 3.0 Instrument Systems

4.0 High Level Controls 5.0 Enclosure 6.0 Support Facilities/Building

The Telescope Mount Assembly

The Enclosure

• Basic envelope for telescope protection

• Minimization of surface area normal to the sun

• 5° taper from front to back • Rotation independent of

TMA through full range• Small circular aperture• Highly ventilated• Thermally controlled

The Optical Design

Table 1.6. Summary of the functions of characteristics of the ATST mirrorsMirror Function Diameter Optical Characteristics

OSS Gregorian OpticsM1 Primary Mirror 4240 mm Off-axis concave parabolaM2 Transfer f /2 prime focus to f /13 Gregorian,

compensate for misalignment, and provide fast steering during coronal observations.

635 mm Off-axis concave ellipsoid

OSS Coudé Transfer OpticsM3 Folding mirror, quasi-static alignment compensator 160 x 114 mm FlatM4 Transfer f /13 Gregorian to f /50 intermediate focus 450 mm Off-axis concave ellipsoidMount Base Assembly Coudé Transfer OpticsM5 Fast steering mirror for coudé observations 220 mm FlatM6 Quasi-static alignment compensator 275 mm FlatCoudé Rotator Transfer OpticsM7 Folding Mirror 540 mm FlatM8 Collimating Mirror 600 mm Concave SphereM9 Folding Mirror 430 mm FlatM10 High-order deformable mirror 220 mm Nominally flatBS1 AO beam splitter 220 mm Flat

Form Follows Function

OSS Gregorian Optics

M1 Assembly

The Optical Support Structure (OSS)

TEOA FrameAssembly

M2 Assembly

Heat StopTop End Optical Assembly (TEOA)

The Heat Stop

Coudé Transfer Optics

M3

M4

M5M6

Azimuth Axis

Altitude Axis

Gregorian Focus

OSS Coudé Transfer and Mount Base Transfer Optics

Tracking the Sun

Coudé Rotator Transfer Optics

Coudé Rotator Optics (view from above)