Overview

The E and B mode EXperiment, (EBEX) is a balloon-borne telescope which aims to measure the polarization of the cosmic microwave background radiation in three frequency bands: 150, 250, and 410 GHz. EBEX had an engineering flight on June 11, 2009. It was launched from the Columbia Scientific Balloon Facility in Fort Sumner, New Mexico, and terminated near the California-Arizona border following a ≈ 14 hour flight. We present an overview of the EBEX instrument and science goals. To achieve its goal of 8 arcminute resolution, EBEX requires precise pointing, which is achieved through the use of a star camera and gyroscopes. In addition, EBEX employs several coarse sensors, including a sun sensor. The sun sensor is designed to give the position of the sun to better than 1, while the star camera gives the position of the telescope to within 6 arcseconds. We discuss the design, implementation, and performance of these two pointing sensors for EBEX and review their performance during the North American flight.

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9781244583290

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