2014
DOI: 10.1117/12.2055572
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Thermal and optical characterization for POLARBEAR-2 optical system

Abstract: Downloaded From: http://proceedings.spiedigitallibrary.org/ on 05/15/2015 Terms of Use: http://spiedl.org/terms ABSTRACT POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment for B-mode detection. The PB-2 receiver has a large focal plane and aperture that consists of 7588 transition edge sensor (TES) bolometers at 250 mK. The receiver consists of the optical cryostat housing reimaging lenses and infrared filters, and the detector cryostat housing TES bolometers. The large focal pla… Show more

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Cited by 7 publications
(14 citation statements)
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“…It consists of the box-type cryostat for the focal plane, and the optics tube for lenses and filters. 6,7 The PB-2 receiver will be housed in a new telescope with the POLARBEAR-1 (PB-1) design. 1 The detector and refractive optical system are cooled with a combination of two pulse tube coolers and a sorption cooler.…”
Section: Instrument Overviewmentioning
confidence: 99%
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“…It consists of the box-type cryostat for the focal plane, and the optics tube for lenses and filters. 6,7 The PB-2 receiver will be housed in a new telescope with the POLARBEAR-1 (PB-1) design. 1 The detector and refractive optical system are cooled with a combination of two pulse tube coolers and a sorption cooler.…”
Section: Instrument Overviewmentioning
confidence: 99%
“…The PB-2 optics consists of combination of an off-axis Gregorian telescope and alumina re-imaging lenses. 6,10 The primary and secondary mirrors meet the Mizuguchi-Dragon condition 12,13 to cancel the aberration and Proc. of SPIE Vol.…”
Section: Opticsmentioning
confidence: 99%
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“…The aforementioned next-generation CMB projects demand multi-layer AR coatings on large IR filters with a typical diameter of 500 mm. In the previous studies, the PO-LARBEAR group attempted to develop a two-layer AR coating method with epoxy on an alumina surface, with a diameter of 50 mm [7][8][9] . However, the epoxy and alumina cracked during thermal cycling.…”
Section: Introductionmentioning
confidence: 99%
“…6 In order to keep the detector sensivitity high enough, efficient infra-red (IR) filters should be considered. One promising solution to this problem is to introduce an alumina plate as an IR filter with high thermal conductivity [3][4][5]7,8 . The alumina a) iyuki@post.kek.jp filter absorbs the incident IR emission efficiently.…”
Section: Introductionmentioning
confidence: 99%