The EBEX experiment

Oxley, Paul; Ade, Peter A. R.; Baccigalupi, C.; deBernardis, P.; Cho, H--M.; Devlin, Mark J.; Hanany, Shaul; Johnson, Bradley R.; Jones, T. J.; Lee, A. T.; Matsumura, Tomotake; Miller, Amber; Milligan, Michael; Renbarger, T.; Spieler, H.; Stompor, R.; Tucker, Gregory S.; Zaldarriaga, Matías

doi:10.1117/12.563447

Cited by 96 publications

(52 citation statements)

References 55 publications

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“…The forthcoming next generation of low-noise CMB polarization experiments such as EBEX (Oxley et al 2004), POLARBEAR (Kermish et al 2012), SPTpol (McMahon et al 2009), and ACTpol (Niemack et al 2010) and their future upgrades (e.g., POLARBEAR-II, Tomaru et al 2012) will be able to target a CMB observable most affected by weak lensingthe B-mode polarization. Indeed, primordial CMB gradient-like polarization (E-modes) is converted into curl-like polarization (B-modes) by gravitational lensing (Zaldarriaga & Seljak 1998) and is expected to completely dominate the primordial signal at least at small angular scales.…”

Section: Introductionmentioning

confidence: 99%

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

Fabbian

Stompor

2013

A&A

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We studied the accuracy, robustness, and self-consistency of pixel-domain simulations of the gravitational lensing effect on the primordial cosmic microwave background (CMB) anisotropies due to the large-scale structure of the Universe. In particular, we investigated the dependence of the precision of the results precision on some crucial parameters of these techniques and propose a semi-analytic framework to determine their values so that the required precision is a priori assured and the numerical workload simultaneously optimized. Our focus was on the B-mode signal, but we also discuss other CMB observables, such as the total intensity, T , and E-mode polarization, emphasizing differences and similarities between all these cases. Our semi-analytic considerations are backed up by extensive numerical results. Those are obtained using a code, nicknamed lenS 2 HAT -for lensing using scalable spherical harmonic transforms (S 2 HAT) -which we have developed in the course of this work. The code implements a version of the previously described pixel-domain approach and permits performing the simulations at very high resolutions and data volumes, thanks to its efficient parallelization provided by the S 2 HAT library -a parallel library for calculating of the spherical harmonic transforms. The code is made publicly available.

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Section: Introductionmentioning

confidence: 99%

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

Fabbian

Stompor

2013

A&A

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“…EBEX is also a balloon-borne CMB polarimeter, aiming at smaller angular scales and with a dust monitor at 410 GHz (Oxley et al 2004). …”

Section: Introductionmentioning

confidence: 99%

A cryogenic waveplate rotator for polarimetry at mm and submm wavelengths

Salatino

Bernardis

Masi

2011

A&A

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Context. Polarimetry at mm and submm wavelengths is the new frontier of research in cosmic microwave background and interstellar dust studies. Polarimeters working in the IR to MM range need to be operated at cryogenic temperatures to limit the systematic effects related to the emission of the polarization analyzer. Aims. We study the effect of the temperature of the different components of a waveplate polarimeter and describe a system able to rotate a birefringent crystal at 4 K in a completely automated way. Methods. We simulate the main systematic effects related to the temperature and non-ideality of the optical components in a Stokes polarimeter. To limit these effects, a cryogenic implementation of the polarimeter is mandatory. In our system, the rotation produced by a step motor running at room temperature is transmitted down to cryogenic temperatures by means of a long shaft and gears running on custom cryogenic bearings. Results. Our system is able to rotate a birefringent crystal at 4 K in a completely automated way and dissipates only a few mW in the cold environment. A readout system based on optical fibers allows us to control the rotation of the crystal to better than 0.1 • . Conclusions. This device fulfills the stringent requirements for operations in cryogenic space experiments, such as the forthcoming PILOT, BOOMERanG and LSPE.

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“…The most important example of an external modulator is a half-wave plate. 20,23 To compare these different approaches, we recall the two primary purposes of modulators. First, they can put the signal frequency above the 1/f noise frequency.…”

Section: Polarization Modulation/opticsmentioning

confidence: 99%

Antenna-coupled TES bolometers for the SPIDER experiment

Kuo

Bock

Day

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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We have developed a completely lithographic antenna-coupled bolometer for CMB polarimetry. The necessary components of a millimeter wave radiometer -a beam forming element, a band defining filter, and the TES detectors -are fabricated on a silicon chip with photolithography. The densely populated antennas allow a very efficient use of the focal plane area. We have fabricated and characterized a series of prototype devices. We find that their properties, including the frequency and angular responses, are in good agreement with the theoretical expectations. The devices are undergoing optimization for upcoming CMB experiments.

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The EBEX experiment

Cited by 96 publications

References 55 publications

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

High-precision simulations of the weak lensing effect on cosmic microwave background polarization

A cryogenic waveplate rotator for polarimetry at mm and submm wavelengths

Antenna-coupled TES bolometers for the SPIDER experiment

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