### Speaker

Alessandro Paiella
(Sapienza and ROMA1)

### Description

In this contribution, we are going to show the design and the electrical performance of the horn-coupled lumped element kinetic inductance detectors (LEKIDs) for the OLIMPO experiment. OLIMPO is a balloon borne mission, devoted to the study of the largest structures in the Universe, by detecting the Sunyaev-Zel’Dovich effect of the Comsic Microwave Background (CMB) photons crossing clusters of galaxies. The multi-band focal planes (centered at 0.15, 0.20, 0.35 and 0.48 THz), large aperture telescope (2.6 m),
photometric and spectrometer configuration (OLIMPO is equipped with a plug-in differential Fourier transform spectrometer) make OLIMPO able to characaterize all the components of the Sunyaev-Zel’dovich effect with unprecedented precision. The design of the LEKIDs has been optimized to cope with a wide range of optical loadings (corresponding to both photometric and spectrometric configurations). The electrical characterization of the LEKID arrays was performed in the OLIMPO cryostat, at a temperutare around 300 mK and under a constant optical load lower than 500 fW. The readout electronics is a customized ROACH-2 coupled to a MUSIC DAC/ADC board. The averaged reasponsivities for the arrays, measured from the phase readout, are 1.18×10^(11) rad/W for the 0.15 THz array, 4.10×10^(10) rad/W for the 0.20 THz array, 1.09×10^(12) rad/W for the 0.35 THz array, and 4.41×10^(11) rad/W for the 0.48 THz array. Therefore, measuring the spectral noise density for each pixels of the arrays, whose average values are 2.5×10^(−5) rad/sqrt(Hz) for the 0.15 THz array, 3.6×10^(−5) rad/sqrt(Hz) for the 0.20 THz array, 5.1×10^(−5) rad/sqrt(Hz) for the 0.35 THz array, and 1.9×10^(−9) rad/sqrt(Hz) for the 0.48 THz array, we obtained the values of the averaged electrical noise equivalent power (NEP) over all the arrays: 2×10^(−16) W/sqrt(Hz), 9×10^(−16) W/sqrt(Hz), 5×10^(−17) W/sqrt(Hz), and 4×10^(−17) W/sqrt(Hz) respectively for the four OLIMPO arrays.

### Primary author

Alessandro Paiella
(Sapienza and ROMA1)

### Co-authors

Alessandro Coppolecchia
(Sapienza and ROMA1)
Elia Stefano Battistelli
(Sapienza and ROMA1)
Fabio Columbro
(Dipartimento di Fisica, Sapienza)
Francesco Piacentini
(Sapienza and ROMA1)
Giuseppe D'Alessandro
(Dipartimento di Fisica - Sapienza)
Ivan Colantoni
(IFN-CNR)
Luca Lamagna
(Sapienza and ROMA1)
Maria Gabriella Castellano
(IFN-CNR)
Paolo De Bernardis
(Sapienza and ROMA1)
Philip Mauskopf
(Arizona State University)
Samuel Gordon
(Arizona State University)
Silvia Masi
(Sapienza and ROMA1)