The optical performance of the PILOT instrument from ground end-to-end tests |
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| Authors: | R Misawa J-Ph Bernard Y Longval I Ristorcelli P Ade D Alina Y André J Aumont L Bautista P de Bernardis O Boulade F Bousqet M Bouzit V Buttice A Caillat M Chaigneau M Charra B Crane F Douchin E Doumayrou J P Dubois C Engel M Griffin G Foenard S Grabarnik P Hargrave A Hughes R Laureijs B Leriche S Maestre B Maffei C Marty W Marty S Masi J Montel L Montier B Mot J Narbonne F Pajot E Pérot J Pimentao G Pisano N Ponthieu L Rodriguez G Roudil M Salatino G Savini O Simonella M Saccoccio J Tauber C Tucker |
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| Institution: | 1.Institut de Recherche en Astrophysique et Planetologie (IRAP),Université Paul Sabatier,Toulouse Cedex 4,France;2.LAM,Marseille CEDEX 13,France;3.Institut d’Astrophysique Spatiale (IAS),Université Paris XI,Orsay,France;4.Department of Physics and Astrophysics,Cardiff University,Cardiff,UK;5.Centre National d’études Spatiales,Toulouse,France;6.Dipartimento di Fisica,Universita degli studi di Roma “La Sapienza”,Roma,Italy;7.CEA/Saclay,Gif-sur-Yvette Cedex,France;8.Scientific Support Office, SRE-S,ESTEC,Noordwijk,The Netherlands;9.Grenoble University,Grenoble,France;10.Thales Services,Toulouse,France;11.Optical Science Laboratory,UCL,London,UK;12.Department of Physics, School of Science and Technology,Nazarbayev University,Astana,Kazakhstan;13.Institut de Recherche en Astrophysique et Planetologie (IRAP),Université Paris XI,Toulouse Cedex 4,France |
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| Abstract: | The Polarized Instrument for Long-wavelength Observation of the Tenuous interstellar medium (PILOT) is a balloon-borne astronomy experiment designed to study the linear polarization of thermal dust emission in two photometric bands centred at wavelengths 240 μm (1.2 THz) and 550 μm (545 GHz), with an angular resolution of a few arcminutes. Several end-to-end tests of the instrument were performed on the ground between 2012 and 2014, in order to prepare for the first scientific flight of the experiment that took place in September 2015 from Timmins, Ontario, Canada. This paper presents the results of those tests, focussing on an evaluation of the instrument’s optical performance. We quantify image quality across the extent of the focal plane, and describe the tests that we conducted to determine the focal plane geometry, the optimal focus position, and sources of internal straylight. We present estimates of the detector response, obtained using an internal calibration source, and estimates of the background intensity and background polarization. |
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