Planck-LFI: design and performance of the 4 Kelvin Reference Load Unit

被引：30

作者：

Valenziano, L. ^{[1
]}

Cuttaia, F. ^{[1
]}

De Rosa, A. ^{[1
]}

Terenzi, L. ^{[1
]}

Brighenti, A. ^{[1
]}

Cazzola, G. P. ^{[1
]}

Garbesi, A. ^{[2
]}

Mariotti, S. ^{[3
]}

Orsi, G. ^{[1
]}

Pagan, L. ^{[5
]}

Cavaliere, F. ^{[6
]}

Biggi, M. ^{[4
]}

Lapini, R. ^{[4
]}

Panagin, E. ^{[4
]}

Battaglia, P. ^{[4
]}

Butler, R. C. ^{[1
]}

Bersanelli, M. ^{[6
]}

D'Arcangelo, O. ^{[7
]}

Levin, S. ^{[8
]}

Mandolesi, N. ^{[1
]}

Mennella, A. ^{[6
]}

Morgante, G. ^{[1
]}

Morigi, G. ^{[1
]}

Sandri, M. ^{[1
]}

Simonetto, A. ^{[7
]}

Tomasi, M. ^{[9
]}

Villa, F.

Frailis, M. ^{[10
]}

Galeotta, S. ^{[11
]}

Gregorio, A. ^{[10
,11
]}

Leonardi, R. ^{[12
]}

Lowe, S. R. ^{[13
]}

Maris, M. ^{[10
]}

Meinhold, P. ^{[12
]}

Mendes, L. ^{[14
]}

Stringhetti, L. ^{[1
]}

Zonca, A. ^{[9
]}

Zacchei, A.

机构：

[1] INAF, Ist Astrofis Spaziale & Fis Cosm Bologna, I-40129 Bologna, Italy

[2] CNR, Ist Sintesi Organ & Fotoreattivita, I-40129 Bologna, Italy

[3] INAF, Ist Radioastron, I-40129 Bologna, Italy

[4] Off Pasquali, I-50142 Florence, Italy

[5] Thales Alenia Space Italia, Sede Milano, I-20090 Vimodrone, Italy

[6] Univ Milan, I-20133 Milan, Italy

[7] CNR, Ist Fis Plasma, I-20125 Milan, Italy

[8] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[9] INAF, Ist Astrofis Spaziale & Fis Cosm Milano, I-20133 Milan, Italy

[10] INAF, Osservatorio Astron Treste, I-34143 Trieste, Italy

[11] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[12] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[13] Univ Manchester, Jodrell Bank, Ctr Astrophys, Manchester M13 9PL, Lancs, England

[14] European Space Agcy, NL-2200 AG Noordwijk, Netherlands

来源：

JOURNAL OF INSTRUMENTATION | 2009年 / 4卷

关键词：

Space instrumentation; Microwave radiometers; Instruments for CMB observations; Microwave Calibrators; LOW-FREQUENCY INSTRUMENT; 1/F NOISE; SUBMILLIMETER; SYSTEM; BOARD;

D O I：

10.1088/1748-0221/4/12/T12006

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The LFI radiometers use a pseudo-correlation design where the signal from the sky is continuously compared with a stable reference signal, provided by a cryogenic reference load system. The reference unit is composed by small pyramidal horns, one for each radiometer, 22 in total, facing small absorbing targets, made of a commercial resin ECCOSORB CR (TM), cooled to similar to 4.5 K. Horns and targets are separated by a small gap to allow thermal decoupling. Target and horn design is optimized for each of the LFI bands, centered at 70, 44 and 30 GHz. Pyramidal horns are either machined inside the radiometer 20K module or connected via external electroformed bended waveguides. The requirement of high stability of the reference signal imposed a careful design for the radiometric and thermal properties of the loads. Materials used for the manufacturing have been characterized for thermal, RF and mechanical properties. We describe in this paper the design and the performance of the reference system.

引用

页数：29

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