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Kinetic Inductance Detectors (KIDs) are superconductive low$-$temperaturedetectors useful for astrophysics and particle physics. We have developedarrays of lumped elements KIDs (LEKIDs) sensitive to microwave photons,optimized for the four horn-coupled focal planes of the OLIMPO balloon-bornetelescope, working in the spectral bands centered at 150 GHz, 250 GHz, 350 GHz,and 460 GHz. This is aimed at measuring the spectrum of the Sunyaev-Zel'dovicheffect for a number of galaxy clusters, and will validate LEKIDs technology ina space-like environment. Our detectors are optimized for an intermediatebackground level, due to the presence of residual atmosphere androom--temperature optical system and they operate at a temperature of 0.3 K.The LEKID planar superconducting circuits are designed to resonate between 100and 600 MHz, and to match the impedance of the feeding waveguides; the measuredquality factors of the resonators are in the $10^{4}-10^{5}$ range, and theyhave been tuned to obtain the needed dynamic range. The readout electronics iscomposed of a $cold$ $part$, which includes a low noise amplifier, adc$-$block, coaxial cables, and power attenuators; and a $room-temperature$$part$, FPGA$-$based, including up and down-conversion microwave components (IQmodulator, IQ demodulator, amplifiers, bias tees, attenuators). In thiscontribution, we describe the optimization, fabrication, characterization andvalidation of the OLIMPO detector system.

Kinetic Inductance Detectors and readout electronics for the OLIMPO experiment