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Imaging and spectroscopy at (sub-)millimeter wavelengths are key frontiers inastronomy and cosmology. Large area spectral surveys with moderate spectralresolution (R=50-200) will be used to characterize large scale structure andstar formation through intensity mapping surveys in emission lines such as theCO rotational transitions. Such surveys will also be used to study the SZeffect, and will detect the emission lines and continuum spectrum of individualobjects. WSPEC is an instrument proposed to target these science goals. It is achannelizing spectrometer realized in rectangular waveguide, fabricated usingconventional high-precision metal machining. Each spectrometer is coupled tofree space with a machined feed horn, and the devices are tiled into a 2D arrayto fill the focal plane of the telescope. The detectors will be aluminumLumped-Element Kinetic Inductance Detectors (LEKIDs). To target the CO linesand SZ effect, we will have bands at 135-175 GHz and 190-250 GHz, eachNyquist-sampled at R~200 resolution. Here we discuss the instrument concept anddesign, and successful initial testing of a WR10 (i.e. 90 GHz) prototypespectrometer. We recently tested a WR5 (180 GHz) prototype to verify that theconcept works at higher frequencies, and also designed a resonant backshortstructure that may further increase the optical efficiency. We are makingprogress towards integrating a spectrometer with a LEKID array and deploying aprototype device to a telescope for first light.

WSPEC: A waveguide filter-bank focal plane array spectrometer for millimeter wave astronomy and cosmology