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Scientific Impact of the Operating Temperature for NFIRAOS on TMT

Abstract 107

Submitted by David ANDERSEN


D. Andersen, G. Herriot




We present the scientific gain enjoyed by client instruments when NFIRAOS is cooled. If NFIRAOS is cooled to -20 C, the background contribution of NFIRAOS will not exceed 15% of the background from sky plus TMT (for a telescope build to current requirements). If cooled further to -30 C, the K-band inter-OH background-limited exposure times could decrease by more than 7%. We evaluate these gains achieved by cooling NFIRAOS in light of increased technical risks and costs.