MITO is a multi-purpose experiment mainly finalized for sub/mm cosmological observations. Here we describe essentially the SZ-meter version specifically dedicated to photometric measurements of the Sunyaev-Zel'dovich effect towards near and large clusters. The instrumentation consists of a 2.6 meter in diameter ground-based flux collector located at the top of the Testa Grigia mountain (3480 m a.s.l. AO - Italy). A single-pixel photometer (17 arcmin FWHM) operating at 150, 209, 270 and 335 GHz cools down four bolometric detectors to 290 mK for 4 nights continuously by a double stage He-3-He-4 fridge. An electromechanical system allows for a field of view sky modulation with several profiles and high duty cycle limiting the microphonic noise on the detectors. Atmospheric fluctuations are thus reduced by means of triple-beam subreflector spatial modulation and synchronous demodulation.
MITO: A 2.6-m mm/sub-mm ground based telescope / DE PETRIS, Marco; Melchiorri, Francesco; DE BERNARDIS, Paolo; DE MICCO, A; Lamagna, Luca; Masi, Silvia; Orlando, A; Pisano, Giampaolo; Romano, F; Siringo, G; Colafrancesco, S; Rephaeli, Y; Signore, M; Kreysa, E.. - (2000). (Intervento presentato al convegno Workshop on Astronomy and Astrophysics at Sub Millimeter Wavelengths tenutosi a Rome).
MITO: A 2.6-m mm/sub-mm ground based telescope
DE PETRIS, Marco;MELCHIORRI, Francesco;DE BERNARDIS, Paolo;LAMAGNA, Luca;MASI, Silvia;PISANO, Giampaolo;
2000
Abstract
MITO is a multi-purpose experiment mainly finalized for sub/mm cosmological observations. Here we describe essentially the SZ-meter version specifically dedicated to photometric measurements of the Sunyaev-Zel'dovich effect towards near and large clusters. The instrumentation consists of a 2.6 meter in diameter ground-based flux collector located at the top of the Testa Grigia mountain (3480 m a.s.l. AO - Italy). A single-pixel photometer (17 arcmin FWHM) operating at 150, 209, 270 and 335 GHz cools down four bolometric detectors to 290 mK for 4 nights continuously by a double stage He-3-He-4 fridge. An electromechanical system allows for a field of view sky modulation with several profiles and high duty cycle limiting the microphonic noise on the detectors. Atmospheric fluctuations are thus reduced by means of triple-beam subreflector spatial modulation and synchronous demodulation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
