17 September 2012 Design, analysis, and performance verification of the interface region imaging spectrograph (IRIS) telescope primary mirror assembly
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Abstract
We discuss the details of the Interface Region Imaging Spectrograph (IRIS) telescope primary mirror assembly designcompared to its predecessor used in the Solar Dynamics Observatory Atmospheric Imaging Assembly (SDO-AIA) telescopes. Also included are details of the structural modeling and analysis, mirror optical surface modeling, vibration analysis, and a detailed description of the optical performance verification test program and results.The primary mirror assembly of the IRIS telescope was adapted from an existing design used on the SDO-AIA telescopes. The IRIS telescope was optimized for performance at 1369Å and 2810Å with a required 0.4 arc-second-resolution calling for a significant improvement to the mounted mirror optical surface quality over the existing SDOAIA design.To improve the optical performance, the proven bonded flexure heritage design was augmented with a novel “kinematic” mount used to secure the assembly to the telescope tube. The 200mm diameter concave mirror was fabricated from Corning ULE/RE Code 7973 EUV Premium Grade, Ultra Low Expansion Glass material and polished to better than 12ÅRMS surface roughness. The mirror is supported by three bonded titanium flexures fastened to a rigid titanium cell plate.A 25Å RMS figure error was allocated in the error budget for the mounted, coated primary mirror. The first moderesonance for the mirror was specified to be <100 Hz while surviving an expected launch load of 30G’s. The mirrorassembly was designed to operate from +14°C to +26°C with survival limits specified at -20°C to +35°C.
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Edward N. Hertz, Peter N. Cheimets, William A. Podgorski, Thomas Perry, Sang C. Park, Henry W. Bergner, Richard Gates, Vanessa Marquez, Michael F. Honsa, "Design, analysis, and performance verification of the interface region imaging spectrograph (IRIS) telescope primary mirror assembly", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84433F (17 September 2012); doi: 10.1117/12.925484; https://doi.org/10.1117/12.925484
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KEYWORDS
Mirrors

IRIS Consortium

Telescopes

Eye models

Optical instrument design

Kinematics

Finite element methods

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