DESHIMA (for Deep Spectroscopic High-redshift Mapper) is a
Japanese/Netherlands submillimeter spectrometer installed on
the ASTEsubmillimetertelescope. (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.