Abstract
We are going to describe 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 Cosmic Microwave Background (CMB) photons crossing clusters of galaxies. The multi-band focal planes (centered at 150, 200, 350 and 480 GHz), 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 characaterise all the components of the Sunyaev-Zel'dovich effect with unprecedented precision. The design of the LEKIDs has been optimised to cope with a wide range of optical loadings (corresponding to both photometric and spectrometric configurations). The electrical characterisation of the LEKID arrays was performed in the OLIMPO cryostat, at a temperature around 300 mK and under a constant optical load lower than 500 fW. The readout electronics is a customised ROACH-2 coupled to a MUSIC DAC/ADC board. The averaged responsivities for the arrays, measured from the phase readout, are 1.18x1011 rad/W for the 150 GHz array, 4.10x1010 rad/W for the 200 GHz array, 1.09x1012 rad/W for the 350 GHz array, and 4.41x1011 rad/W for the 480 GHz array. Therefore, measuring the spectral noise density for each pixels of the arrays, whose average values are 2.5x10-5 rad/Hz(1/2) for the 150 GHz array, 3.6x10-5 rad/Hz(1/2) for the 200 GHz array, 5.1x10-5 rad/Hz(1/2) for the 350 GHz array, and 1.9x10-5 rad/Hz(1/2) for the 480 GHz array, we obtained the values of the averaged electrical noise equivalent power (NEP) over all the arrays: 2x10-16 W/Hz(1/2), 9x10-16 W/Hz(1/2), 5x10-17 W/Hz(1/2), and 4x10-17 W/Hz(1/2) respectively for the four OLIMPO arrays.
Original language | English (US) |
---|---|
Title of host publication | 2017 16th International Superconductive Electronics Conference, ISEC 2017 |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 1-3 |
Number of pages | 3 |
Volume | 2018-January |
ISBN (Electronic) | 9781509058686 |
DOIs | |
State | Published - Mar 9 2018 |
Event | 16th International Superconductive Electronics Conference, ISEC 2017 - Napoli, Italy Duration: Jun 12 2017 → Jun 16 2017 |
Other
Other | 16th International Superconductive Electronics Conference, ISEC 2017 |
---|---|
Country | Italy |
City | Napoli |
Period | 6/12/17 → 6/16/17 |
Keywords
- CMB radiation
- kinetic inductance detectors
- OLIMPO experiment
- SZ effect
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics