DESHIMA

DESHIMA (for Deep Spectroscopic High-redshift Mapper) is a Japanese/Netherlands submillimeter spectrometer installed on the ASTE submillimeter telescope. (The name DESHIMA was clearly inspired by inspired by the Japanese island, Deshima aka Dejima, which historically served as a Japanese/Netherlands trading port.) The spectrometer's frequency-range at first light (2017) was 335-370 GHz, which allows detection of the ionized carbon fine structure line ([CII]) through a redshift-range of roughly z = 4.2 to 4.6. For sensitivity, the appropriate portions of the instrument are cooled to 0.15 K. The technology is MKID-based filter banks.

DESHIMA 2.0 is an upgrade, installed in Fall of 2023, and as of early 2024, is undergoing commissioning. It covers a broader frequency-range (220-440 GHz), allowing detection of the line through a redshift-range of z = 3.3 to 7.6. The spectrometer is single-pixel, but a future multiple-pixel version is planned.