Overview of the medium and high frequency telescopes of the LiteBIRD space mission
Ludovic MontierUniversité Fédérale de Toulouse Midi-PyrénéesBaptiste MotIRAP, Universit de Toulouse, CNRS, CNES, UPS, (Toulouse), FrancePaolo de BernardisINFN RomaBruno MaffeiInstitut d'Astrophysique Spatiale (IAS), CNRS, UMR 8617, Universit Paris-Sud 11, Btiment 121, 91405 Orsay, FranceGiampaolo PisanoFabio ColumbroDipartimento di Fisica, Universit La Sapienza, P. le A. Moro 2, Roma, Italy andJon E. GudmundssonStockholm UniversitySophie Henrot-VersilléLuca LamagnaINFN RomaJoshua MontgomeryMcGill University, Physics Department, Montreal, QC H3A 0G4, CanadaThomas ProuvéMegan RussellUniversity of California San DiegoGiorgio SaviniOptical Science Laboratory, Physics and Astronomy Dept., University College London (UCL)Samantha SteverThe University of TokyoKeith L. ThompsonSLAC National Accelerator Laboratory, Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), Menlo Park, CA 94025, USAMasahiro TsujimotoJapan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Sagamihara, Kanagawa 252-5210, JapanCarole TuckerCardiff University, School of Physics and Astronomy, Cardiff CF10 3XQ, UKBenjamin WestbrookUniversity of California, Berkeley, Department of Physics, Berkeley, CA 94720, USAPeter A. AdeCardiff University, School of Physics and Astronomy, Cardiff CF10 3XQ, UKAlexandre AdlerStockholm UniversityErwan AllysLaboratoire de Physique de l' cole Normale Suprieure, ENS, Universit PSL, CNRS, Sorbonne Universit, Universit de Paris, 75005 Paris, FranceKam ArnoldUniversity of California San DiegoDidier AugusteInstitut National de Physique Nucléaire et de Physique des ParticulesJonathan AumontUniversité Toulouse III - Paul SabatierRagnhild AurlienUniversity of Oslo, Institute of Theoretical Astrophysics, NO-0315 Oslo, NorwayJason AustermannNational Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USACarlo BaccigalupiInternational School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, ItalyAnthony J. BandayUniversité Toulouse III - Paul SabatierRanajoy BanerjiCentre for Theoretical Physics and AstrophysicsRita B. BarreiroSoumen BasakJim BeallNational Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USADominic BeckStanford University, Department of Physics, CA 94305-4060, USAShawn BeckmanUniversity of California, Berkeley, Department of Physics, Berkeley, CA 94720, USAJuan BermejoMarco BersanelliJulien BonisInstitut National de Physique Nucléaire et de Physique des ParticulesJulian BorrillFrancois BoulangerSorbonne UniversitéSophie BounissouInstitut d'Astrophysique SpatialeMaksym BrilenkovCentre for Theoretical Physics and AstrophysicsMichael BrownMartin BucherErminia CalabreseCardiff University, School of Physics and Astronomy, Cardiff CF10 3XQ, UKPaolo CampetiInternational School for Advanced Studies (SISSA), Via Bonomea 265, 34136, Trieste, ItalyAlessandro CaronesFrancisco J. CasasAnthony ChallinorVictor ChanKolen CheungUniversity of California, Berkeley, Department of Physics, Berkeley, CA 94720, USAYuji ChinoneJean F. ClicheMcGill University, Physics Department, Montreal, QC H3A 0G4, CanadaLoris ColomboJavier CubasAri CukiermanUniversity of California, Berkeley, Department of Physics, Berkeley, CA 94720, USADavid CurtisGiuseppe D'AlessandroINFN RomaNadia DachlythraStockholm UniversityMarco De PetrisINFN RomaClive DickinsonPatricia Diego-PalazuelosMatt DobbsMcGill University, Physics Department, Montreal, QC H3A 0G4, CanadaTadayasu DotaniInstitute of Space and Astronautical ScienceLionel DubandCEA GrenobleShannon DuffNational Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USAJean M. DuvalUniv. Grenoble Alpes, CEA, IRIG-DSBT, 38000 Grenoble, FranceKen EbisawaJapan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Sagamihara, Kanagawa 252-5210, JapanTucker ElleflotHans K. EriksenUniversity of Oslo, Institute of Theoretical Astrophysics, NO-0315 Oslo, NorwayJosquin ErrardThomas Essinger-HilemanFabio FinelliRaphael FlaugerUniversity of California San DiegoCristian FranceschetUnni FuskelandCentre for Theoretical Physics and AstrophysicsMathew GallowayUniversity of Oslo, Institute of Theoretical Astrophysics, NO-0315 Oslo, NorwayKen GangaJian R. GaoRicardo Genova-SantosMartina GerbinoMassimo GervasiTommaso GhignaThe University of TokyoEirik GjerløwCentre for Theoretical Physics and AstrophysicsMarcin L. GradzielJulien GrainInstitut d'Astrophysique Spatiale (IAS), CNRS, UMR 8617, Universit Paris-Sud 11, Btiment 121, 91405 Orsay, FranceFrank GruppAlessandro GruppusoTijmen de HaanNils W. HalversonPeter HargraveCardiff University, School of Physics and Astronomy, Cardiff CF10 3XQ, UKTakashi HasebeInstitute of Space and Astronautical ScienceMasaya HasegawaMakoto HattoriMasashi HazumiInstitute of Space and Astronautical ScienceDaniel HermanUniversity of Oslo, Institute of Theoretical Astrophysics, NO-0315 Oslo, NorwayDiego HerranzCharles A. HillUniversity of California, Berkeley, Department of Physics, Berkeley, CA 94720, USAGene HiltonNational Institute of Standards and Technology (NIST), Boulder, Colorado 80305, USAYukimasa HirotaEric Hivon
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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-, Medium-and 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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