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The Next Generation Balloon-borne Large Aperture Submillimeter Telescope(BLAST-TNG) is a submillimeter mapping experiment planned for a 28 daylong-duration balloon (LDB) flight from McMurdo Station, Antarctica during the2018-2019 season. BLAST-TNG will detect submillimeter polarized interstellardust emission, tracing magnetic fields in galactic molecular clouds. BLAST-TNGwill be the first polarimeter with the sensitivity and resolution to probe the$\sim$0.1 parsec-scale features that are critical to understanding the originof structures in the interstellar medium. With three detector arrays operatingat 250, 350, and 500 $\mu$m (1200, 857, and 600 GHz), BLAST-TNG will obtaindiffraction-limited resolution at each waveband of 30, 41, and 59 arcsecondsrespectively.  To achieve the submillimeter resolution necessary for its science goals, theBLAST-TNG telescope features a 2.5 m aperture carbon fiber composite primarymirror, one of the largest mirrors flown on a balloon platform. Successfulperformance of such a large telescope on a balloon-borne platform requiresstiff, lightweight optical components and mounting structures. Through acombination of optical metrology and finite element modeling of thermal andmechanical stresses on both the telescope optics and mounting structures, weexpect diffraction-limited resolution at all our wavebands. We expect pointingerrors due to deformation of the telescope mount to be negligible. We havedeveloped a detailed thermal model of the sun shielding, gondola, and opticalcomponents to optimize our observing strategy and increase the stability of thetelescope over the flight. We present preflight characterization of thetelescope and its platform.

Design and Characterization of a Balloon-Borne Diffraction-Limited Submillimeter Telescope Platform for BLAST-TNG