Development of a cold chopper for TAO/MIMIZUKU

Honda, Mitsuhiko; Kamizuka, Takafumi; Jikuya, Ichiro; Miyata, Takashi; Katō, K.; Uchida, Daichi; Kondo, Shingo; Michifuji, Tsubasa; Yamada, Katsuhiko

doi:10.1117/12.2561926

Cited by 1 publication

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“…Indeed, for the 30 m class telescopes, the secondary mirror will be too large to chop (i.e., in the case of the TMT, M2 is 3.1 m is diameter) and hence other methodologies for removal of the array/sky noise are required. Instead, promising work proceeds for chopping/ nodding a mirror located at a pupil plane interior to the instrument (i.e., Honda et al 2020), principal component analysis (PCA, Hunziker et al 2018), and so-called drift scanning techniques (i.e., Ohsawa et al 2018, PTF 2021.…”

Section: On the Chop/nod Techniquementioning

confidence: 99%

CanariCam Mid-infrared Drift Scanning: Improved Sensitivity and Spatial Resolution

Torres-Quijano

Packham

Acosta

2021

PASP

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Ground-based mid-infrared (MIR) astronomical observations require the removal of the fast time variable components of (a) sky/background variation and (b) array background. Typically, this has been achieved through oscillating the telescope’s secondary mirror a few times a second, a process termed “chopping.” However, chopping reduces on-object photon collection time, imposes stringent demands on the secondary mirror, requires nodding of the telescope to remove the radiative offset imprinted by the chopping, and relies on an often-fixed chop-frequency regardless of the sky conditions in the actual observations. In the 30 m telescope era, secondary mirror chopping is impracticable. However, if the sky and background are sufficiently stable, drift scanning holds the promise to remove the necessity of chopping. In this paper, we report our encouraging drift scanning results using the CanariCam MIR instrument on the 10.4 m Gran Telescopio Canarias and the implications to future instruments and experiments.

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Section: On the Chop/nod Techniquementioning

confidence: 99%