Status of the Dark Energy Survey Camera (DECam) project

Flaugher, B.; Abbott, T. M. C.; Annis, J.; Antonik, M.; Bailey, Jan; Ballester, O.; Bernstein, Joseph P.; Bernstein, R. A.; Bonati, Marco; Bremer, Gale; Briones, Jorge; Brooks, D.; Buckley-Geer, E.; Campa, J.; Cardiel-Sas, Laia; Castander, F. J.; Castilla, Javier; Cease, H.; Chappa, S.; Chi, Edward C.; Costa, L. Da; DePoy, D. L.; Derylo, G.; Vicente, J. De; Diehl, H. T.; Doel, P.; Estrada, J.; Eiting, J.; Elliott, A.; Finley, D. A.; Frieman, J.; Gaztañaga, E.; Gerdes, D. W.; Gladders, M. D.; Guarino, V. J.; Gutiérrez, G.; Grudzinski, J.; Hanlon, B. E.; Hao, Jiangang; Holland, S.; Honscheid, K.; Huffman, Dave; Jackson, Cheryl; Karliner, I.; Kau, D.; Kent, S.; Krempetz, K.; Krider, J.; Kozlovsky, Mark; Kubik, D.; Kuêhn, K.; Kuhlmann, S. E.; Kuk, K.; Lahav, O.; Lewis, P.; Lin, Huan; Lorenzon, W.; Marshall, Stuart; Martínez, G.; McKay, Timothy A.; Merritt, W.; Meyer, M.; Miquel, R.; Morgan, Jim; Moore, Peter; Moore, Todd; Nord, B.; Ogando, R. L. C.; Olsen, J.; Peoples, J.; Plazas, Andreas; Roe, Natalie A.; Roodman, A.; Rossetto, Bruno M.; Sánchez, E.; Scarpine, V.; Schalk, T.; Schindler, R. H.; Schmidt, R.; Schmitt, R.; Schubnell, M.; Schultz, Kenneth R.; Selen, M.; Serrano, S.; Shaw, Terri; Simaitis, V.; Slaughter, J.; Smith, R.; Spinka, H. M.; Stefanik, Andy; Stuermer, W.; Sypniewski, Adam; Talaga, Rick; Tarlè, G.; Thaler, J. J.; Tucker, D. L.; Walker, A. R.; Weaverdyck, Curtis; Wester, W. C.; Woods, Robert J.; Worswick, S. P.; Zhao, Allen

doi:10.1117/12.926216

Cited by 58 publications

(29 citation statements)

References 12 publications

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“…One of the unique advantages of the ACTPol and AdvACT surveys is the large overlap with optical surveys like BOSS, 13 HSC, 14 DES, 15 DESI 16 and LSST. 17 This overlap allows for powerful cross-correlation studies and new probes of dark energy and the neutrino mass sum.…”

Section: -11mentioning

confidence: 99%

Survey strategy optimization for the Atacama Cosmology Telescope

Bernardis¹,

Stevens

Hasselfield

et al. 2016

Observatory Operations: Strategies, Processes, and Systems VI

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In recent years there have been significant improvements in the sensitivity and the angular resolution of the instruments dedicated to the observation of the Cosmic Microwave Background (CMB). ACTPol is the first polarization receiver for the Atacama Cosmology Telescope (ACT) and is observing the CMB sky with arcmin resolution over ∼2000 sq. deg. Its upgrade, Advanced ACTPol (AdvACT), will observe the CMB in five frequency bands and over a larger area of the sky. We describe the optimization and implementation of the ACTPol and AdvACT surveys. The selection of the observed fields is driven mainly by the science goals, that is, small angular scale CMB measurements, B-mode measurements and cross-correlation studies. For the ACTPol survey we have observed patches of the southern galactic sky with low galactic foreground emissions which were also chosen to maximize the overlap with several galaxy surveys to allow unique cross-correlation studies. A wider field in the northern galactic cap ensured significant additional overlap with the BOSS spectroscopic survey. The exact shapes and footprints of the fields were optimized to achieve uniform coverage and to obtain cross-linked maps by observing the fields with different scan directions. We have maximized the efficiency of the survey by implementing a close to 24 hour observing strategy, switching between daytime and nighttime observing plans and minimizing the telescope idle time. We describe the challenges represented by the survey optimization for the significantly wider area observed by AdvACT, which will observe roughly half of the low-foreground sky. The survey strategies described here may prove useful for planning future ground-based CMB surveys, such as the Simons Observatory and CMB Stage IV surveys.

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Section: -11mentioning

confidence: 99%

Survey strategy optimization for the Atacama Cosmology Telescope

Bernardis¹,

Stevens

Hasselfield

et al. 2016

Observatory Operations: Strategies, Processes, and Systems VI

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“…The Dark Energy Camera (DECam) [1], is the primary instrument used in the Dark Energy Survey [2]. DECam is a 3 sq.…”

Section: Introductionmentioning

confidence: 99%

Performance of the dark energy camera liquid nitrogen cooling system

Cease¹,

Alvarez²,

Alvarez³

et al. 2014

AIP Conference Proceedings

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Abstract. The Dark Energy Camera, the Imager and its cooling system was installed onto the Blanco 4m telescope at the Cerro Tololo Inter-American Observatory in Chile in September 2012. The imager cooling system is a LN2 two-phase closed loop cryogenic cooling system. The cryogenic circulation processing is located off the telescope. Liquid nitrogen vacuum jacketed transfer lines are run up the outside of the telescope truss tubes to the imager inside the prime focus cage. The design of the cooling system along with commissioning experiences and initial cooling system performance is described. The LN2 cooling system with the DES imager was initially operated at Fermilab for testing, then shipped and tested in the Blanco Coudé room. Now the imager is operating inside the prime focus cage. It is shown that the cooling performance sufficiently cools the imager in a closed loop mode, which can operate for extended time periods without maintenance or LN2 fills.

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“…When a suitable sawtooth waveform is applied to the piezoceramic tube, the resulting stick-slip friction between cup and ball allows the spine to be tilted to any desired position. 1 will@aao.gov.au 2 DES is a 5-year multiband imaging survey over 5000 deg 2 , using the Blanco telescope together with a new 2.2° Wide Field Corrector and camera (DECam) [1], and now in its commissioning phase. The aim is to constrain Dark Energy via Weak Lensing and Baryon Acoustic Oscillations.…”

Section: Introductionmentioning

confidence: 99%

'MOHAWK: a 4000-fiber positioner for DESpec

et al. 2012

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We present a concept for a 4000-fibre positioner for DESpec, based on the Echidna 'tilting spine' technology. The DESpec focal plane is 450mm across and curved, and the required pitch is ~6.75mm. The size, number of fibers and curvature are all comparable with various concept studies for similar instruments already undertaken at the AAO, but present new challenges in combination. A simple, low-cost, and highly modular design is presented, consisting of identical modules populated by identical spines. No show-stopping issues in accommodating either the curvature or the smaller pitch have been identified, and the actuators consist largely of off-the-shelf components. The actuators have been prototyped at AAO, and allow reconfiguration times of ~15s to reach position errors 7 microns or less. Straightforward designs for metrology, acquisition, and guiding are also proposed. The throughput losses of the entire positioner system are estimated to be ~15%, of which 6.3% is attributable to the tilting-spine technology.

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Status of the Dark Energy Survey Camera (DECam) project

Cited by 58 publications

References 12 publications

Survey strategy optimization for the Atacama Cosmology Telescope

Survey strategy optimization for the Atacama Cosmology Telescope

Performance of the dark energy camera liquid nitrogen cooling system

'MOHAWK: a 4000-fiber positioner for DESpec

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