The Infrared Imaging Spectrograph (IRIS) for TMT: the atmospheric dispersion corrector
Andrew C. Phillips, Brian J. Bauman, James E. Larkin, Anna M. Moore,, Cynthia N. Niehaus, David Cramptone, Luc Simard
TL;DR
This paper presents a conceptual design for an atmospheric dispersion corrector for the TMT's IRIS instrument, addressing severe atmospheric effects to improve infrared imaging quality.
Contribution
It introduces a novel ADC design meeting strict residual dispersion requirements and discusses alternative options and performance tradeoffs.
Findings
Residual dispersion less than 1 milliarcsecond achievable
Design effectively corrects atmospheric dispersion in infrared observations
Performance tradeoffs between different ADC configurations
Abstract
We present a conceptual design for the atmospheric dispersion corrector (ADC) for TMT's Infrared Imaging Spectrograph (IRIS). The severe requirements of this ADC are reviewed, as are limitations to observing caused by uncorrectable atmospheric effects. The requirement of residual dispersion less than 1 milliarcsecond can be met with certain glass combinations. The design decisions are discussed and the performance of the design ADC is described. Alternative options and their performance tradeoffs are also presented.
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