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arXiv · 2606.29787

GLTCAM: Concept of Multi-color Millimeter and Submillimeter Camera for the Greenland Telescope

Shuhei Inoue·Tatsuya Takekoshi·Shinsuke Uno·Kazuki Watanabe·Taiki Sato·Toshihiro Tsuzuki·Satoru Mima·Tohru Taino·Kazuyuki Fujita·Shunichi Nakatsubo·Yuki Kimura·Chiko Otani·Ryohei Kawabe·Kotaro Kohno·Tai Oshima
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Abstract

To investigate the formation history of large-scale structure through the dynamics of galaxy clusters, we are developing a multi-color millimeter and submillimeter-wave continuum camera (GLTCAM) for deployment on the Green-land Telescope (GLT). GLTCAM will observe in six frequency bands - three in the millimeter range (150, 220, and 270 GHz) and three in the submillimeter range (350, 400, and 670 GHz). The optical design provides a compact configuration that fits within the GLT receiver cabin, while delivering diffraction-limited performance over an $18'$ field of view with minimal telecentricity error and distortion. A key advantage of this design is its uniform illumination footprint at the cold stop, which helps minimize thermal loading on both the detectors and the cryogenic stages. The focal plane module comprises a quasi-optical bandpass filter, a conical horn array coupled with planar ortho mode transducers (OMTs), and a superconducting multi-color microwave kinetic inductance detector (MKID) array. Current development efforts are focused on the three-color millimeter-wave module. The detector array employs a single-layer coplanar waveguide (CPW) architecture, which simplifies fabrication and enables scalability to large-format arrays. GLTCAM aims for the early realization of next-generation wide-field, multi-color observations as a pathfinder for future large submillimeter telescopes.

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Shuhei Inoue, Tatsuya Takekoshi, Shinsuke Uno, Kazuki Watanabe, Taiki Sato, Toshihiro Tsuzuki, Satoru Mima, Tohru Taino, Kazuyuki Fujita, Shunichi Nakatsubo, Yuki Kimura, Chiko Otani, Ryohei Kawabe, Kotaro Kohno, Tai Oshima. 2026-06-29. GLTCAM: Concept of Multi-color Millimeter and Submillimeter Camera for the Greenland Telescope. https://doi.org/10.1109/tasc.2026.3664169

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