Progress Report on the Large-Scale Polarization Explorer

Lamagna, L.; Addamo, Giuseppe; Ade, Peter A. R.; Baccigalupi, C.; Baldini, A.; Battaglia, P.; Battistelli, E. S.; Baù, A.; Bersanelli, M.; Biasotti, M.; Boragno, C.; Boscaleri, A.; Caccianiga, B.; Caprioli, S.; Cavaliere, F.; Cei, F.; Cleary, Kieran; Columbro, F.; Coppi, Gabriele; Coppolecchia, A.; Corsini, D.; Cuttaia, F.; D’Alessandro, G.; Bernardis, P. de; Gasperis, G. de; Petris, M. De; Torto, F. Del; Fafone, V.; Farooqui, Z.; Farsian, Farida; Fontanelli, F.; Franceschet, C.; Gaier, T.; Gatti, F.; Génova-Santos, R. T.; Gervasi, M.; Ghigna, Tommaso; Grassi, M.; Grosso, Daniele; Incardona, F.; Jones, M. E.; Kangaslahti, Pekka; Krachmalnicoff, N.; Mainini, Roberto; Maino, D.; Mandelli, S.; Maris, M.; Masi, S.; Matarrese, S.; May, A.; Mena, Patricio; Mennella, A.; Molina, R.; Molinari, D.; Morgante, G.; Nati, F.; Natoli, P.; Pagano, L.; Paiella, A.; Paonessa, Fabio; Passerini, A.; Perez-de-Taoro, M.; Peverini, O. A.; Pezzotta, F.; Piacentini, F.; Piccirillo, L.; Pisano, G.; Polastri, L.; Polenta, G.; Poletti, D.; Presta, G.; Realini, S.; Reyes, Nicolás; Rocchi, A.; Rubiño-Martín, J. A.; Sandri, M.; Sartor, Stefano; Schillaci, A.; Signorelli, G.; Soria, Mary; Spinella, F.; Tapia, Valeria; Tartari, A.; Taylor, Angela C.; Terenzi, L.; Tomasi, M.; Tommasi, E.; Tucker, C.; Vaccaro, D.; Viganò, Daniele; Villa, F.; Virone, G.; Vittorio, N.; Volpe, A.; Watkins, Bridget; Zacchei, A.; Zannoni, M.

doi:10.1007/s10909-020-02454-x

Cited by 21 publications

(17 citation statements)

References 11 publications

(20 reference statements)

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“…The major strengths of the fully refractive configuration are: 1. In addition to being simple and conventional, the design strongly benefits from the broad expertise gained on many current and upcoming sub-orbital CMB experiments, such as BICEP2, 6 Keck, 7 SPIDER, 8 LSPE, 9 and Simons Observatory 10…”

Section: Choice Of Refractive Over Reflective Designmentioning

confidence: 99%

The optical design of the Litebird Medium and High Frequency Telescope

Lamagna

Gudmundsson

Imada

et al. 2020

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave

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LiteBIRD is a JAXA strategic L-class mission devoted to the measurement of polarization of the Cosmic Microwave Background, searching for the signature of primordial gravitational waves in the B-modes pattern of the polarization. The onboard instrumentation includes a Middle and High Frequency Telescope (MHFT), based on a pair of cryogenically cooled refractive telescopes covering, respectively, the 89-224 GHz and the 166-448 GHz bands. Given the high target sensitivity and the careful systematics control needed to achieve the scientific goals of the mission, optical modeling and characterization are performed with the aim to capture most of the physical effects potentially affecting the real performance of the two refractors. We describe the main features of the MHFT, its design drivers and the major challenges in system optimization and characterization. We provide the current status of the development of the optical system and we describe the current plan of activities related to optical performance simulation and validation.

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Section: Choice Of Refractive Over Reflective Designmentioning

confidence: 99%

The optical design of the Litebird Medium and High Frequency Telescope

Lamagna

Gudmundsson

Imada

et al. 2020

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave

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“…1). It gives a very simple and compact design that takes advantage of strong heritage from ground-based and balloon-borne experiments, such as BICEP2, 8 Keck, 9 SPIDER, 10 LSPE, 11 and Simons Observatory. 12 Furthermore, the split between middle and high frequencies facilitates the design of the filtering scheme and the calibration strategy.…”

Section: 3)mentioning

confidence: 99%

Overview of the medium and high frequency telescopes of the LiteBIRD space mission

Montier

Mot

Bernardis

et al. 2020

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave

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LiteBIRD is a JAXA-led Strategic Large-Class mission designed to search for the existence of the primordial gravitational waves produced during the inflationary phase of the Universe, through the measurements of their imprint onto the polarization of the cosmic microwave background (CMB). These measurements, requiring unprecedented sensitivity, will be performed over the full sky, at large angular scales, and over 15 frequency bands from 34 GHz to 448 GHz. The LiteBIRD instruments consist of three telescopes, namely the Low-, Mediumand High-Frequency Telescope (respectively LFT, MFT and HFT). We present in this paper an overview of the design of the Medium-Frequency Telescope (89-224 GHz) and the High-Frequency Telescope (166-448 GHz), the so-called MHFT, under European responsibility, which are two cryogenic refractive telescopes cooled down to 5 K. They include a continuous rotating half-wave plate as the first optical element, two high-density polyethylene (HDPE) lenses and more than three thousand transition-edge sensor (TES) detectors cooled to 100 mK. We provide an overview of the concept design and the remaining specific challenges that we have to face in order to achieve the scientific goals of LiteBIRD.

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“…The overall design of the LSPE program has largely evolved since its first proposal [25][26][27][28], and this paper presents its final design and expected performance. Section 2 describes the two instruments in detail; section 3 reports the expected instrumental sensitivities; section 4 describes the major systematic effects, mitigation techniques and calibration; section 5 presents the methods used in the foreground cleaning and likelihood evaluation and reports the expected performances on cosmological parameters.…”

Section: Introductionmentioning

confidence: 99%

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

Addamo

Ade

Baccigalupi

et al. 2021

J. Cosmol. Astropart. Phys.

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The measurement of the polarization of the Cosmic Microwave Background (CMB) radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial divergence-free component of the polarization field, the B-mode, could reveal the presence of gravitational waves in the early Universe. The detection of such a component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is composed of two instruments: LSPE-Strip, a radiometer-based telescope on the ground in Tenerife-Teide observatory, and LSPE-SWIPE (Short-Wavelength Instrument for the Polarization Explorer) a bolometer-based instrument designed to fly on a winter arctic stratospheric long-duration balloon. The program is among the few dedicated to observation of the Northern Hemisphere, while most of the international effort is focused into ground-based observation in the Southern Hemisphere. Measurements are currently scheduled in Winter 2022/23 for LSPE-SWIPE, with a flight duration up to 15 days, and in Summer 2022 with two years observations for LSPE-Strip. We describe the main features of the two instruments, identifying the most critical aspects of the design, in terms of impact on the performance forecast. We estimate the expected sensitivity of each instrument and propagate their combined observing power to the sensitivity to cosmological parameters, including the effect of scanning strategy, component separation, residual foregrounds and partial sky coverage. We also set requirements on the control of the most critical systematic effects and describe techniques to mitigate their impact. LSPE will reach a sensitivity in tensor-to-scalar ratio of σ r < 0.01, set an upper limit r < 0.015 at 95% confidence level, and improve constraints on other cosmological parameters.

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Progress Report on the Large-Scale Polarization Explorer

Cited by 21 publications

References 11 publications

The optical design of the Litebird Medium and High Frequency Telescope

The optical design of the Litebird Medium and High Frequency Telescope

Overview of the medium and high frequency telescopes of the LiteBIRD space mission

The large scale polarization explorer (LSPE) for CMB measurements: performance forecast

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