Thermal architecture for the SPIDER flight cryostat

Gudmundsson, J. E.; Amiri, M.; Benton, S. J.; Bihary, R.; Bock, J. J.; Bond, J. R.; Bonetti, J. A.; Bryan, Sean; Burger, B.; Chiang, H. C.; Contaldi, C. R.; Crill, B. P.; Doré, O.; Farhang, M.; Filippini, J. P.; Fissel, Laura M.; Gandilo, N. N.; Golwala, S. R.; Halpern, M.; Hasselfield, Matthew; Hilton, G. C.; Holmes, W. A.; Hristov, V. V.; Irwin, K. D.; Jones, W. C.; Kuo, C. L.; MacTavish, C. J.; Mason, P.; Montroy, T. E.; Morford, T. A.; Netterfield, C. B.; O'Dea, D.; Rahlin, A.; Reintsema, C. D.; Ruhl, J. E.; Runyan, M. C.; Schenker, Matthew A.; Shariff, J. A.; Soler, J. D.; Trangsrud, A.; Tucker, C.; Tucker, R. S.; Turner, Anthony

doi:10.1117/12.857925

Cited by 10 publications

(13 citation statements)

References 28 publications

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“…Tolerances and achieved performance are described in more detail in Section 2.2. For a more detailed description of the Spider instrument, we refer the reader to [21,31,32].…”

Section: Descriptionmentioning

confidence: 99%

SPIDER: probing the early Universe with a suborbital polarimeter

Fraisse

Ade

Amiri

et al. 2013

J. Cosmol. Astropart. Phys.

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We evaluate the ability of Spider, a balloon-borne polarimeter, to detect a divergence-free polarization pattern (B-modes) in the cosmic microwave background (CMB). In the inflationary scenario, the amplitude of this signal is proportional to that of the primordial scalar perturbations through the tensor-to-scalar ratio r. We show that the expected level of systematic error in the Spider instrument is significantly below the amplitude of an interesting cosmological signal with r = 0.03. We present a scanning strategy that enables us to minimize uncertainty in the reconstruction of the Stokes parameters used to characterize the CMB, while accessing a relatively wide range of angular scales. Evaluating the amplitude of the polarized Galactic emission in the Spider field, we conclude that the polarized emission from interstellar dust is as bright or brighter than the cosmological signal at all Spider frequencies (90 GHz, 150 GHz, and 280 GHz), a situation similar to that found in the "Southern Hole." We show that two ∼ 20-day flights of the Spider instrument can constrain the amplitude of the B-mode signal to r < 0.03 (99% CL) even when foreground contamination is taken into account. In the absence of foregrounds, the same limit can be reached after one 20-day flight.

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“…Tolerances and achieved performance are described in more detail in Section 2.2. For a more detailed description of the Spider instrument, we refer the reader to [21,31,32].…”

Section: Descriptionmentioning

confidence: 99%

SPIDER: probing the early Universe with a suborbital polarimeter

Fraisse

Ade

Amiri

et al. 2013

J. Cosmol. Astropart. Phys.

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“…G-10 is a high yield strength, low thermal conductivity fiberglass commonly used for cryogenic flexures [15]. The flexures are attached with copper straps to VCS1 and VCS2 to minimize conducted heat flow to the MT [10].…”

Section: Flexures Plumbing and Thermal Connectionsmentioning

confidence: 99%

“…Informed by finite element modeling, the focal plane, as well as the SQUID readout system are surrounded by a 1.6 K spittoon made of Amumetal 4K (A4K), a proprietary nickel and iron alloy. 10 The SQUID mux chips are further shielded by a combination of superconducting niobium backshort, a superconducting niobium enclosure, and A4K sleeves [22,23]. Finally, the telescope tubes are surrounded by a two-layer concentric A4K or Cryoperm 10 magnetic shield assembly which are expected to equilibrate at approximately 5 K. 11 Heat straps connect the superfluid tank to each of the telescope tubes, providing a base temperature for the 10 STPL closed-cycle 3 He adsorption refrigerators that cool each focal plane.…”

Section: Telescope Architecture and Adsorption Refrigeratorsmentioning

confidence: 99%

“…1 After preliminary testing at Redstone, the cryostat was transported to Princeton in January 2010 where numerous cryogenic runs were conducted. A description of the cryostat along with an early performance evaluation can be found in [10]. In 2012, the vacuum integrity of the flight cryostat was tested in the Spacecraft Propulsion Research Facility at the NASA Glenn Research Center in Sandusky, Ohio.…”

Section: Introductionmentioning

confidence: 99%

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The thermal design, characterization, and performance of the S pider long-duration balloon cryostat

Gudmundsson

Amiri

Benton³

et al. 2015

Cryogenics

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We describe the Spider flight cryostat, which is designed to cool six millimeter-wavelength telescopes during an Antarctic long-duration balloon flight. The cryostat, one of the largest to have flown on a stratospheric payload, uses liquid 4 He to deliver cooling power to stages at 4.2 and 1.6 K. Stainless steel capillaries facilitate a high flow impedance connection between the main liquid helium tank and a smaller superfluid tank, allowing the latter to operate at 1.6 K as long as there is liquid in the 4.2 K main tank. Each telescope houses a closed cycle 3 He adsorption refrigerator that further cools the focal planes down to 300 mK. Liquid helium vapor from the main tank is routed through heat exchangers that cool radiation shields, providing negative thermal feedback. The system performed successfully during a 17 day flight in the 2014-2015 Antarctic summer. The cryostat had a total hold time of 16.8 days, with 15.9 days occurring during flight.

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“…The Spider Long Duration Balloon (LDB) cryostat and cryogenic systems are described in detail in Gudmundsson et al 3 (in these proceedings). The cryostat holds ∼ 1000 of liquid helium in a tank shaped like a 6-shot revolver cylinder.…”

Section: Overviewmentioning

confidence: 99%

Design and performance of the SPIDER instrument

et al. 2010

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Here we describe the design and performance of the Spider instrument. Spider is a balloon-borne cosmic microwave background polarization imager that will map part of the sky at 90, 145, and 280 GHz with subdegree resolution and high sensitivity. This paper discusses the general design principles of the instrument inserts, mechanical structures, optics, focal plane architecture, thermal architecture, and magnetic shielding of the TES sensors and SQUID multiplexer. We also describe the optical, noise, and magnetic shielding performance of the 145 GHz prototype instrument insert.

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Thermal architecture for the SPIDER flight cryostat

Cited by 10 publications

References 28 publications

SPIDER: probing the early Universe with a suborbital polarimeter

SPIDER: probing the early Universe with a suborbital polarimeter

The thermal design, characterization, and performance of the S pider long-duration balloon cryostat

Design and performance of the SPIDER instrument

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