Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission
Abstract
Large angular scale surveys in the absence of atmosphere are essential for measuring the primordial -mode power spectrum of the Cosmic Microwave Background (CMB). Since this proposed measurement is about three to four orders of magnitude fainter than the temperature anisotropies of the CMB, in-flight calibration of the instruments and active suppression of systematic effects are crucial. We investigate the effect of changing the parameters of the scanning strategy on the in-flight calibration effectiveness, the suppression of the systematic effects themselves, and the ability to distinguish systematic effects by null-tests. Next-generation missions such as LiteBIRD, modulated by a Half-Wave Plate (HWP), will be able to observe polarisation using a single detector, eliminating the need to combine several detectors to measure polarisation, as done in many previous experiments and hence avoiding the consequent systematic effects. While the HWP is expected to suppress many systematic effects, some of them will remain. We use an analytical approach to comprehensively address the mitigation of these systematic effects and identify the characteristics of scanning strategies that are the most effective for implementing a variety of calibration strategies in the multi-dimensional space of common spacecraft scan parameters. We also present Falcons, a fast spacecraft scanning simulator that we developed to investigate this scanning parameter space.
Cite
@article{arxiv.2408.03040,
title = {Multi-dimensional optimisation of the scanning strategy for the LiteBIRD space mission},
author = {Y. Takase and L. Vacher and H. Ishino and G. Patanchon and L. Montier and S. L. Stever and K. Ishizaka and Y. Nagano and W. Wang and J. Aumont and K. Aizawa and A. Anand and C. Baccigalupi and M. Ballardini and A. J. Banday and R. B. Barreiro and N. Bartolo and S. Basak and M. Bersanelli and M. Bortolami and T. Brinckmann and E. Calabrese and P. Campeti and E. Carinos and A. Carones and F. J. Casas and K. Cheung and L. Clermont and F. Columbro and A. Coppolecchia and F. Cuttaia and P. de Bernardis and T. de Haan and E. de la Hoz and S. Della Torre and P. Diego-Palazuelos and G. D'Alessandro and H. K. Eriksen and J. Errard and F. Finelli and U. Fuskeland and G. Galloni and M. Galloway and M. Gervasi and T. Ghigna and S. Giardiello and C. Gimeno-Amo and E. Gjerløw and R. González González and A. Gruppuso and M. Hazumi and S. Henrot-Versillé and L. T. Hergt and K. Ikuma and K. Kohri and L. Lamagna and M. Lattanzi and C. Leloup and M. Lembo and F. Levrier and A. I. Lonappan and M. López-Caniego and G. Luzzi and B. Maffei and E. Martínez-González and S. Masi and S. Matarrese and F. T. Matsuda and T. Matsumura and S. Micheli and M. Migliaccio and M. Monelli and G. Morgante and B. Mot and R. Nagata and T. Namikawa and A. Novelli and K. Odagiri and S. Oguri and R. Omae and L. Pagano and D. Paoletti and F. Piacentini and M. Pinchera and G. Polenta and L. Porcelli and N. Raffuzzi and M. Remazeilles and A. Ritacco and M. Ruiz-Granda and Y. Sakurai and D. Scott and Y. Sekimoto and M. Shiraishi and G. Signorelli and R. M. Sullivan and H. Takakura and L. Terenzi and M. Tomasi and M. Tristram and B. van Tent and P. Vielva and I. K. Wehus and B. Westbrook and G. Weymann-Despres and E. J. Wollack and M. Zannoni and Y. Zhou},
journal= {arXiv preprint arXiv:2408.03040},
year = {2025}
}