Proceedings of the Particle Physics and Early Universe Conference (PPEUC).
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The effect in the PLANCK LFI radiometers

N. Mandolesi, M. Seiffert, M. Bersanelli, and C. Burigana

Istituto TESRE, Consiglio Nazionale delle Ricerche, Via Gobetti 101, 40129 Bologna, Italy
Physics Department, University of California -- Santa Barbara, Santa Barbara, CA 93106, USA
IFCTR, Consiglio Nazionale delle Ricerche, Via Bassini 15, 20133 Milano, Italy

Abstract:

We use an analytic approach to examine the susceptibility of the PLANCK LFI correlation radiometers to various systematic effects. We examine the effects of amplifiers gain fluctuations, of fluctuations in the amplifiers noise temperatures, in the reference load temperature and in the DC gain ratio. We find that gain fluctuations are suppressed by proper gain modulation, leaving fluctuations in the amplifiers noise temperatures as the main source of type noise. We estimate that the overall knee frequency will be relatively small () and can be reduced further by efficient cooling of the reference loads.

PPEUC Proceedings
Thu Jul 17 14:29:26 BST 1997