Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

Y. Sekimoto; P. A. R. Ade; A. Adler; E. Allys; K. Arnold; D. Auguste; J. Aumont; R. Aurlien; J. Austermann; C. Baccigalupi; A. J. Banday; R. Banerji; R. B. Barreiro; S. Basak; J. Beall; D. Beck; S. Beckman; J. Bermejo; P. de Bernardis; M. Bersanelli; J. Bonis; J. Borrill; F. Boulanger; S. Bounissou; M. Brilenkov; M. Brown; M. Bucher; E. Calabrese; P. Campeti; A. Carones; F. J. Casas; A. Challinor; V. Chan; K. Cheung; Y. Chinone; J. F. Cliche; L. Colombo; F. Columbro; J. Cubas; A. Cukierman; D. Curtis; G. D'Alessandro; N. Dachlythra; M. De Petris; C. Dickinson; P. Diego-Palazuelos; M. Dobbs; T. Dotani; L. Duband; S. Duff; J. M. Duval; K. Ebisawa; T. Elleflot; H. K. Eriksen; J. Errard; T. Essinger-Hileman; F. Finelli; R. Flauger; C. Franceschet; U. Fuskeland; M. Galloway; K. Ganga; J. R. Gao; R. Genova-Santos; M. Gerbino; M. Gervasi; T. Ghigna; E. Gjerløw; M. L. Gradziel; J. Grain; F. Grupp; A. Gruppuso; J. E. Gudmundsson; T. de Haan; N. W. Halverson; P. Hargrave; T. Hasebe; M. Hasegawa; M. Hattori; M. Hazumi; S. Henrot-Versillé; D. Herman; D. Herranz; C. A. Hill; G. Hilton; Y. Hirota; E. Hivon; R. A. Hlozek; Y. Hoshino; E. de la Hoz; J. Hubmayr; K. Ichiki; T. iida; H. Imada; K. Ishimura; H. Ishino; G. Jaehnig; T. Kaga; S. Kashima; N. Katayama; A. Kato; T. Kawasaki; R. Keskitalo; T. Kisner; Y. Kobayashi; N. Kogiso; A. Kogut; K. Kohri; E. Komatsu; K. Komatsu; K. Konishi; N. Krachmalnicoff; I. Kreykenbohm; C. L. Kuo; A. Kushino; L. Lamagna; J. V. Lanen; M. Lattanzi; A. T. Lee; C. Leloup; F. Levrier; E. Linder; T. Louis; G. Luzzi; T. Maciaszek; B. Maffei; D. Maino; M. Maki; S. Mandelli; E. Martinez-Gonzalez; S. Masi; T. Matsumura; A. Mennella; M. Migliaccio; Y. Minanmi; K. Mitsuda; J. Montgomery; L. Montier; G. Morgante; B. Mot; Y. Murata; J. A. Murphy; M. Nagai; Y. Nagano; T. Nagasaki; R. Nagata; S. Nakamura; T. Namikawa; P. Natoli; S. Nerval; T. Nishibori; H. Nishino; C. O'Sullivan; H. Ogawa; S. Oguri; H. Ohsaki; I. S. Ohta; N. Okada; L. Pagano; A. Paiella; D. Paoletti; G. Patanchon; J. Peloton; F. Piacentini; G. Pisano; G. Polenta; D. Poletti; T. Prouvé; G. Puglisi; D. Rambaud; C. Raum; S. Realini; M. Reinecke; M. Remazeilles; A. Ritacco; G. Roudil; J. A. Rubino-Martin; M. Russell; H. Sakurai; Y. Sakurai; M. Sandri; M. Sasaki; G. Savini; D. Scott; J. Seibert; B. Sherwin; K. Shinozaki; M. Shiraishi; P. Shirron; G. Signorelli; G. Smecher; S. Stever; R. Stompor; H. Sugai; S. Sugiyama; A. Suzuki; J. Suzuki; T. L. Svalheim

doi:10.1117/12.2561841

Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

Y. Sekimoto, P. A. R. Ade, A. Adler, E. Allys, K. Arnold, D. Auguste, J. Aumont, R. Aurlien, J. Austermann, C. Baccigalupi, A. J. Banday, R. Banerji, R. B. Barreiro, S. Basak, J. Beall, D. Beck, S. Beckman, J. Bermejo, P. de Bernardis, M. BersanelliJ. Bonis, J. Borrill, F. Boulanger, S. Bounissou, M. Brilenkov, M. Brown, M. Bucher, E. Calabrese, P. Campeti, A. Carones, F. J. Casas, A. Challinor, V. Chan, K. Cheung, Y. Chinone, J. F. Cliche, L. Colombo, F. Columbro, J. Cubas, A. Cukierman, D. Curtis, G. D'Alessandro, N. Dachlythra, M. De Petris, C. Dickinson, P. Diego-Palazuelos, M. Dobbs, T. Dotani, L. Duband, S. Duff, J. M. Duval, K. Ebisawa, T. Elleflot, H. K. Eriksen, J. Errard, T. Essinger-Hileman, F. Finelli, R. Flauger, C. Franceschet, U. Fuskeland, M. Galloway, K. Ganga, J. R. Gao, R. Genova-Santos, M. Gerbino, M. Gervasi, T. Ghigna, E. Gjerløw, M. L. Gradziel, J. Grain, F. Grupp, A. Gruppuso, J. E. Gudmundsson, T. de Haan, N. W. Halverson, P. Hargrave, T. Hasebe, M. Hasegawa, M. Hattori, M. Hazumi, S. Henrot-Versillé, D. Herman, D. Herranz, C. A. Hill, G. Hilton, Y. Hirota, E. Hivon, R. A. Hlozek, Y. Hoshino, E. de la Hoz, J. Hubmayr, K. Ichiki, T. iida, H. Imada, K. Ishimura, H. Ishino, G. Jaehnig, T. Kaga, S. Kashima, N. Katayama, A. Kato, T. Kawasaki, R. Keskitalo, T. Kisner, Y. Kobayashi, N. Kogiso, A. Kogut, K. Kohri, E. Komatsu, K. Komatsu, K. Konishi, N. Krachmalnicoff, I. Kreykenbohm, C. L. Kuo, A. Kushino, L. Lamagna, J. V. Lanen, M. Lattanzi, A. T. Lee, C. Leloup, F. Levrier, E. Linder, T. Louis, G. Luzzi, T. Maciaszek, B. Maffei, D. Maino, M. Maki, S. Mandelli, E. Martinez-Gonzalez, S. Masi, T. Matsumura, A. Mennella, M. Migliaccio, Y. Minanmi, K. Mitsuda, J. Montgomery, L. Montier, G. Morgante, B. Mot, Y. Murata, J. A. Murphy, M. Nagai, Y. Nagano, T. Nagasaki, R. Nagata, S. Nakamura, T. Namikawa, P. Natoli, S. Nerval, T. Nishibori, H. Nishino, C. O'Sullivan, H. Ogawa, S. Oguri, H. Ohsaki, I. S. Ohta, N. Okada, L. Pagano, A. Paiella, D. Paoletti, G. Patanchon, J. Peloton, F. Piacentini, G. Pisano, G. Polenta, D. Poletti, T. Prouvé, G. Puglisi, D. Rambaud, C. Raum, S. Realini, M. Reinecke, M. Remazeilles, A. Ritacco, G. Roudil, J. A. Rubino-Martin, M. Russell, H. Sakurai, Y. Sakurai, M. Sandri, M. Sasaki, G. Savini, D. Scott, J. Seibert, B. Sherwin, K. Shinozaki, M. Shiraishi, P. Shirron, G. Signorelli, G. Smecher, S. Stever, R. Stompor, H. Sugai, S. Sugiyama, A. Suzuki, J. Suzuki, T. L. Svalheim

Research output: Contribution to conference › Paper

Abstract

LiteBIRD has been selected as JAXA's strategic large mission in the 2020s, to observe the cosmic microwave background (CMB) B-mode polarization over the full sky at large angular scales. The challenges of LiteBIRD are the wide field-of-view (FoV) and broadband capabilities of millimeter-wave polarization measurements, which are derived from the system requirements. The possible paths of stray light increase with a wider FoV and the far sidelobe knowledge of -56 dB is a challenging optical requirement. A crossed-Dragone configuration was chosen for the low frequency telescope (LFT : 34-161 GHz), one of LiteBIRD's onboard telescopes. It has a wide field-of-view (18° x 9°) with an aperture of 400 mm in diameter, corresponding to an angular resolution of about 30 arcminutes around 100 GHz. The focal ratio f/3.0 and the crossing angle of the optical axes of 90° are chosen after an extensive study of the stray light. The primary and secondary reflectors have rectangular shapes with serrations to reduce the diffraction pattern from the edges of the mirrors. The reflectors and structure are made of aluminum to proportionally contract from warm down to the operating temperature at 5 K. A 1/4 scaled model of the LFT has been developed to validate the wide field-of-view design and to demonstrate the reduced far sidelobes. A polarization modulation unit (PMU), realized with a half-wave plate (HWP) is placed in front of the aperture stop, the entrance pupil of this system. A large focal plane with approximately 1000 AlMn TES detectors and frequency multiplexing SQUID amplifiers is cooled to 100 mK. The lens and sinuous antennas have broadband capability. Performance specifications of the LFT and an outline of the proposed verification plan are presented.

Original language	English
DOIs	https://doi.org/10.1117/12.2561841
Publication status	Published - 1 Dec 2020

Access to Document

10.1117/12.2561841

https://ui.adsabs.harvard.edu/abs/2020SPIE11453E..10S

Cite this

Sekimoto, Y., Ade, P. A. R., Adler, A., Allys, E., Arnold, K., Auguste, D., Aumont, J., Aurlien, R., Austermann, J., Baccigalupi, C., Banday, A. J., Banerji, R., Barreiro, R. B., Basak, S., Beall, J., Beck, D., Beckman, S., Bermejo, J., de Bernardis, P., ... Svalheim, T. L. (2020). Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD. https://doi.org/10.1117/12.2561841

@conference{859d65a46b11478db80cd59daf07a381,

title = "Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD",

abstract = "LiteBIRD has been selected as JAXA's strategic large mission in the 2020s, to observe the cosmic microwave background (CMB) B-mode polarization over the full sky at large angular scales. The challenges of LiteBIRD are the wide field-of-view (FoV) and broadband capabilities of millimeter-wave polarization measurements, which are derived from the system requirements. The possible paths of stray light increase with a wider FoV and the far sidelobe knowledge of -56 dB is a challenging optical requirement. A crossed-Dragone configuration was chosen for the low frequency telescope (LFT : 34-161 GHz), one of LiteBIRD's onboard telescopes. It has a wide field-of-view (18° x 9°) with an aperture of 400 mm in diameter, corresponding to an angular resolution of about 30 arcminutes around 100 GHz. The focal ratio f/3.0 and the crossing angle of the optical axes of 90° are chosen after an extensive study of the stray light. The primary and secondary reflectors have rectangular shapes with serrations to reduce the diffraction pattern from the edges of the mirrors. The reflectors and structure are made of aluminum to proportionally contract from warm down to the operating temperature at 5 K. A 1/4 scaled model of the LFT has been developed to validate the wide field-of-view design and to demonstrate the reduced far sidelobes. A polarization modulation unit (PMU), realized with a half-wave plate (HWP) is placed in front of the aperture stop, the entrance pupil of this system. A large focal plane with approximately 1000 AlMn TES detectors and frequency multiplexing SQUID amplifiers is cooled to 100 mK. The lens and sinuous antennas have broadband capability. Performance specifications of the LFT and an outline of the proposed verification plan are presented.",

author = "Y. Sekimoto and Ade, {P. A. R.} and A. Adler and E. Allys and K. Arnold and D. Auguste and J. Aumont and R. Aurlien and J. Austermann and C. Baccigalupi and Banday, {A. J.} and R. Banerji and Barreiro, {R. B.} and S. Basak and J. Beall and D. Beck and S. Beckman and J. Bermejo and {de Bernardis}, P. and M. Bersanelli and J. Bonis and J. Borrill and F. Boulanger and S. Bounissou and M. Brilenkov and M. Brown and M. Bucher and E. Calabrese and P. Campeti and A. Carones and Casas, {F. J.} and A. Challinor and V. Chan and K. Cheung and Y. Chinone and Cliche, {J. F.} and L. Colombo and F. Columbro and J. Cubas and A. Cukierman and D. Curtis and G. D'Alessandro and N. Dachlythra and {De Petris}, M. and C. Dickinson and P. Diego-Palazuelos and M. Dobbs and T. Dotani and L. Duband and S. Duff and Duval, {J. M.} and K. Ebisawa and T. Elleflot and Eriksen, {H. K.} and J. Errard and T. Essinger-Hileman and F. Finelli and R. Flauger and C. Franceschet and U. Fuskeland and M. Galloway and K. Ganga and Gao, {J. R.} and R. Genova-Santos and M. Gerbino and M. Gervasi and T. Ghigna and E. Gjerl{\o}w and Gradziel, {M. L.} and J. Grain and F. Grupp and A. Gruppuso and Gudmundsson, {J. E.} and {de Haan}, T. and Halverson, {N. W.} and P. Hargrave and T. Hasebe and M. Hasegawa and M. Hattori and M. Hazumi and S. Henrot-Versill{\'e} and D. Herman and D. Herranz and Hill, {C. A.} and G. Hilton and Y. Hirota and E. Hivon and Hlozek, {R. A.} and Y. Hoshino and {de la Hoz}, E. and J. Hubmayr and K. Ichiki and T. iida and H. Imada and K. Ishimura and H. Ishino and G. Jaehnig and T. Kaga and S. Kashima and N. Katayama and A. Kato and T. Kawasaki and R. Keskitalo and T. Kisner and Y. Kobayashi and N. Kogiso and A. Kogut and K. Kohri and E. Komatsu and K. Komatsu and K. Konishi and N. Krachmalnicoff and I. Kreykenbohm and Kuo, {C. L.} and A. Kushino and L. Lamagna and Lanen, {J. V.} and M. Lattanzi and Lee, {A. T.} and C. Leloup and F. Levrier and E. Linder and T. Louis and G. Luzzi and T. Maciaszek and B. Maffei and D. Maino and M. Maki and S. Mandelli and E. Martinez-Gonzalez and S. Masi and T. Matsumura and A. Mennella and M. Migliaccio and Y. Minanmi and K. Mitsuda and J. Montgomery and L. Montier and G. Morgante and B. Mot and Y. Murata and Murphy, {J. A.} and M. Nagai and Y. Nagano and T. Nagasaki and R. Nagata and S. Nakamura and T. Namikawa and P. Natoli and S. Nerval and T. Nishibori and H. Nishino and C. O'Sullivan and H. Ogawa and S. Oguri and H. Ohsaki and Ohta, {I. S.} and N. Okada and L. Pagano and A. Paiella and D. Paoletti and G. Patanchon and J. Peloton and F. Piacentini and G. Pisano and G. Polenta and D. Poletti and T. Prouv{\'e} and G. Puglisi and D. Rambaud and C. Raum and S. Realini and M. Reinecke and M. Remazeilles and A. Ritacco and G. Roudil and Rubino-Martin, {J. A.} and M. Russell and H. Sakurai and Y. Sakurai and M. Sandri and M. Sasaki and G. Savini and D. Scott and J. Seibert and B. Sherwin and K. Shinozaki and M. Shiraishi and P. Shirron and G. Signorelli and G. Smecher and S. Stever and R. Stompor and H. Sugai and S. Sugiyama and A. Suzuki and J. Suzuki and Svalheim, {T. L.}",

year = "2020",

month = dec,

day = "1",

doi = "10.1117/12.2561841",

language = "English",

}

Sekimoto, Y, Ade, PAR, Adler, A, Allys, E, Arnold, K, Auguste, D, Aumont, J, Aurlien, R, Austermann, J, Baccigalupi, C, Banday, AJ, Banerji, R, Barreiro, RB, Basak, S, Beall, J, Beck, D, Beckman, S, Bermejo, J, de Bernardis, P, Bersanelli, M, Bonis, J, Borrill, J, Boulanger, F, Bounissou, S, Brilenkov, M, Brown, M, Bucher, M, Calabrese, E, Campeti, P, Carones, A, Casas, FJ, Challinor, A, Chan, V, Cheung, K, Chinone, Y, Cliche, JF, Colombo, L, Columbro, F, Cubas, J, Cukierman, A, Curtis, D, D'Alessandro, G, Dachlythra, N, De Petris, M, Dickinson, C, Diego-Palazuelos, P, Dobbs, M, Dotani, T, Duband, L, Duff, S, Duval, JM, Ebisawa, K, Elleflot, T, Eriksen, HK, Errard, J, Essinger-Hileman, T, Finelli, F, Flauger, R, Franceschet, C, Fuskeland, U, Galloway, M, Ganga, K, Gao, JR, Genova-Santos, R, Gerbino, M, Gervasi, M, Ghigna, T, Gjerløw, E, Gradziel, ML, Grain, J, Grupp, F, Gruppuso, A, Gudmundsson, JE, de Haan, T, Halverson, NW, Hargrave, P, Hasebe, T, Hasegawa, M, Hattori, M, Hazumi, M, Henrot-Versillé, S, Herman, D, Herranz, D, Hill, CA, Hilton, G, Hirota, Y, Hivon, E, Hlozek, RA, Hoshino, Y, de la Hoz, E, Hubmayr, J, Ichiki, K, iida, T, Imada, H, Ishimura, K, Ishino, H, Jaehnig, G, Kaga, T, Kashima, S, Katayama, N, Kato, A, Kawasaki, T, Keskitalo, R, Kisner, T, Kobayashi, Y, Kogiso, N, Kogut, A, Kohri, K, Komatsu, E, Komatsu, K, Konishi, K, Krachmalnicoff, N, Kreykenbohm, I, Kuo, CL, Kushino, A, Lamagna, L, Lanen, JV, Lattanzi, M, Lee, AT, Leloup, C, Levrier, F, Linder, E, Louis, T, Luzzi, G, Maciaszek, T, Maffei, B, Maino, D, Maki, M, Mandelli, S, Martinez-Gonzalez, E, Masi, S, Matsumura, T, Mennella, A, Migliaccio, M, Minanmi, Y, Mitsuda, K, Montgomery, J, Montier, L, Morgante, G, Mot, B, Murata, Y, Murphy, JA, Nagai, M, Nagano, Y, Nagasaki, T, Nagata, R, Nakamura, S, Namikawa, T, Natoli, P, Nerval, S, Nishibori, T, Nishino, H, O'Sullivan, C, Ogawa, H, Oguri, S, Ohsaki, H, Ohta, IS, Okada, N, Pagano, L, Paiella, A, Paoletti, D, Patanchon, G, Peloton, J, Piacentini, F, Pisano, G, Polenta, G, Poletti, D, Prouvé, T, Puglisi, G, Rambaud, D, Raum, C, Realini, S, Reinecke, M, Remazeilles, M, Ritacco, A, Roudil, G, Rubino-Martin, JA, Russell, M, Sakurai, H, Sakurai, Y, Sandri, M, Sasaki, M, Savini, G, Scott, D, Seibert, J, Sherwin, B, Shinozaki, K, Shiraishi, M, Shirron, P, Signorelli, G, Smecher, G, Stever, S, Stompor, R, Sugai, H, Sugiyama, S, Suzuki, A, Suzuki, J & Svalheim, TL 2020, 'Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD'. https://doi.org/10.1117/12.2561841

TY - CONF

T1 - Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

AU - Sekimoto, Y.

AU - Ade, P. A. R.

AU - Adler, A.

AU - Allys, E.

AU - Arnold, K.

AU - Auguste, D.

AU - Aumont, J.

AU - Aurlien, R.

AU - Austermann, J.

AU - Baccigalupi, C.

AU - Banday, A. J.

AU - Banerji, R.

AU - Barreiro, R. B.

AU - Basak, S.

AU - Beall, J.

AU - Beck, D.

AU - Beckman, S.

AU - Bermejo, J.

AU - de Bernardis, P.

AU - Bersanelli, M.

AU - Bonis, J.

AU - Borrill, J.

AU - Boulanger, F.

AU - Bounissou, S.

AU - Brilenkov, M.

AU - Brown, M.

AU - Bucher, M.

AU - Calabrese, E.

AU - Campeti, P.

AU - Carones, A.

AU - Casas, F. J.

AU - Challinor, A.

AU - Chan, V.

AU - Cheung, K.

AU - Chinone, Y.

AU - Cliche, J. F.

AU - Colombo, L.

AU - Columbro, F.

AU - Cubas, J.

AU - Cukierman, A.

AU - Curtis, D.

AU - D'Alessandro, G.

AU - Dachlythra, N.

AU - De Petris, M.

AU - Dickinson, C.

AU - Diego-Palazuelos, P.

AU - Dobbs, M.

AU - Dotani, T.

AU - Duband, L.

AU - Duff, S.

AU - Duval, J. M.

AU - Ebisawa, K.

AU - Elleflot, T.

AU - Eriksen, H. K.

AU - Errard, J.

AU - Essinger-Hileman, T.

AU - Finelli, F.

AU - Flauger, R.

AU - Franceschet, C.

AU - Fuskeland, U.

AU - Galloway, M.

AU - Ganga, K.

AU - Gao, J. R.

AU - Genova-Santos, R.

AU - Gerbino, M.

AU - Gervasi, M.

AU - Ghigna, T.

AU - Gjerløw, E.

AU - Gradziel, M. L.

AU - Grain, J.

AU - Grupp, F.

AU - Gruppuso, A.

AU - Gudmundsson, J. E.

AU - de Haan, T.

AU - Halverson, N. W.

AU - Hargrave, P.

AU - Hasebe, T.

AU - Hasegawa, M.

AU - Hattori, M.

AU - Hazumi, M.

AU - Henrot-Versillé, S.

AU - Herman, D.

AU - Herranz, D.

AU - Hill, C. A.

AU - Hilton, G.

AU - Hirota, Y.

AU - Hivon, E.

AU - Hlozek, R. A.

AU - Hoshino, Y.

AU - de la Hoz, E.

AU - Hubmayr, J.

AU - Ichiki, K.

AU - iida, T.

AU - Imada, H.

AU - Ishimura, K.

AU - Ishino, H.

AU - Jaehnig, G.

AU - Kaga, T.

AU - Kashima, S.

AU - Katayama, N.

AU - Kato, A.

AU - Kawasaki, T.

AU - Keskitalo, R.

AU - Kisner, T.

AU - Kobayashi, Y.

AU - Kogiso, N.

AU - Kogut, A.

AU - Kohri, K.

AU - Komatsu, E.

AU - Komatsu, K.

AU - Konishi, K.

AU - Krachmalnicoff, N.

AU - Kreykenbohm, I.

AU - Kuo, C. L.

AU - Kushino, A.

AU - Lamagna, L.

AU - Lanen, J. V.

AU - Lattanzi, M.

AU - Lee, A. T.

AU - Leloup, C.

AU - Levrier, F.

AU - Linder, E.

AU - Louis, T.

AU - Luzzi, G.

AU - Maciaszek, T.

AU - Maffei, B.

AU - Maino, D.

AU - Maki, M.

AU - Mandelli, S.

AU - Martinez-Gonzalez, E.

AU - Masi, S.

AU - Matsumura, T.

AU - Mennella, A.

AU - Migliaccio, M.

AU - Minanmi, Y.

AU - Mitsuda, K.

AU - Montgomery, J.

AU - Montier, L.

AU - Morgante, G.

AU - Mot, B.

AU - Murata, Y.

AU - Murphy, J. A.

AU - Nagai, M.

AU - Nagano, Y.

AU - Nagasaki, T.

AU - Nagata, R.

AU - Nakamura, S.

AU - Namikawa, T.

AU - Natoli, P.

AU - Nerval, S.

AU - Nishibori, T.

AU - Nishino, H.

AU - O'Sullivan, C.

AU - Ogawa, H.

AU - Oguri, S.

AU - Ohsaki, H.

AU - Ohta, I. S.

AU - Okada, N.

AU - Pagano, L.

AU - Paiella, A.

AU - Paoletti, D.

AU - Patanchon, G.

AU - Peloton, J.

AU - Piacentini, F.

AU - Pisano, G.

AU - Polenta, G.

AU - Poletti, D.

AU - Prouvé, T.

AU - Puglisi, G.

AU - Rambaud, D.

AU - Raum, C.

AU - Realini, S.

AU - Reinecke, M.

AU - Remazeilles, M.

AU - Ritacco, A.

AU - Roudil, G.

AU - Rubino-Martin, J. A.

AU - Russell, M.

AU - Sakurai, H.

AU - Sakurai, Y.

AU - Sandri, M.

AU - Sasaki, M.

AU - Savini, G.

AU - Scott, D.

AU - Seibert, J.

AU - Sherwin, B.

AU - Shinozaki, K.

AU - Shiraishi, M.

AU - Shirron, P.

AU - Signorelli, G.

AU - Smecher, G.

AU - Stever, S.

AU - Stompor, R.

AU - Sugai, H.

AU - Sugiyama, S.

AU - Suzuki, A.

AU - Suzuki, J.

AU - Svalheim, T. L.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - LiteBIRD has been selected as JAXA's strategic large mission in the 2020s, to observe the cosmic microwave background (CMB) B-mode polarization over the full sky at large angular scales. The challenges of LiteBIRD are the wide field-of-view (FoV) and broadband capabilities of millimeter-wave polarization measurements, which are derived from the system requirements. The possible paths of stray light increase with a wider FoV and the far sidelobe knowledge of -56 dB is a challenging optical requirement. A crossed-Dragone configuration was chosen for the low frequency telescope (LFT : 34-161 GHz), one of LiteBIRD's onboard telescopes. It has a wide field-of-view (18° x 9°) with an aperture of 400 mm in diameter, corresponding to an angular resolution of about 30 arcminutes around 100 GHz. The focal ratio f/3.0 and the crossing angle of the optical axes of 90° are chosen after an extensive study of the stray light. The primary and secondary reflectors have rectangular shapes with serrations to reduce the diffraction pattern from the edges of the mirrors. The reflectors and structure are made of aluminum to proportionally contract from warm down to the operating temperature at 5 K. A 1/4 scaled model of the LFT has been developed to validate the wide field-of-view design and to demonstrate the reduced far sidelobes. A polarization modulation unit (PMU), realized with a half-wave plate (HWP) is placed in front of the aperture stop, the entrance pupil of this system. A large focal plane with approximately 1000 AlMn TES detectors and frequency multiplexing SQUID amplifiers is cooled to 100 mK. The lens and sinuous antennas have broadband capability. Performance specifications of the LFT and an outline of the proposed verification plan are presented.

AB - LiteBIRD has been selected as JAXA's strategic large mission in the 2020s, to observe the cosmic microwave background (CMB) B-mode polarization over the full sky at large angular scales. The challenges of LiteBIRD are the wide field-of-view (FoV) and broadband capabilities of millimeter-wave polarization measurements, which are derived from the system requirements. The possible paths of stray light increase with a wider FoV and the far sidelobe knowledge of -56 dB is a challenging optical requirement. A crossed-Dragone configuration was chosen for the low frequency telescope (LFT : 34-161 GHz), one of LiteBIRD's onboard telescopes. It has a wide field-of-view (18° x 9°) with an aperture of 400 mm in diameter, corresponding to an angular resolution of about 30 arcminutes around 100 GHz. The focal ratio f/3.0 and the crossing angle of the optical axes of 90° are chosen after an extensive study of the stray light. The primary and secondary reflectors have rectangular shapes with serrations to reduce the diffraction pattern from the edges of the mirrors. The reflectors and structure are made of aluminum to proportionally contract from warm down to the operating temperature at 5 K. A 1/4 scaled model of the LFT has been developed to validate the wide field-of-view design and to demonstrate the reduced far sidelobes. A polarization modulation unit (PMU), realized with a half-wave plate (HWP) is placed in front of the aperture stop, the entrance pupil of this system. A large focal plane with approximately 1000 AlMn TES detectors and frequency multiplexing SQUID amplifiers is cooled to 100 mK. The lens and sinuous antennas have broadband capability. Performance specifications of the LFT and an outline of the proposed verification plan are presented.

U2 - 10.1117/12.2561841

DO - 10.1117/12.2561841

M3 - Paper

ER -

Concept design of low frequency telescope for CMB B-mode polarization satellite LiteBIRD

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