Baking of EOB TTM model

On May 7 at ISAS the Thermal Test Model (TTM) of the Extensible Optical Bench (EOB) underwent a “bake-out” operation (by Nippi co. Ltd.). When fully extended, the EOB measures about six meters long, and looks something like a ladder. High energy X-ray detectors are attached in front of the EOB. The EOB is needed, because in order to collect high energy X-rays the telescope and the detectors must be separated by 12 meters. The EOB is only about one meter long before it has been extended, and during the “bake-out” it was in this unextended state. The picture shows some of the preparations for the operation. After these preparations, the TTM of the EOB was held for about 3 days in a vacuum while being maintained at a temperature of around 60 degrees centigrade. This allowed for all sorts of organic substances sticking to the EOF/TTM to be removed. The EOB was then returned to Nippi where heaters, temperature sensors and thermal regulation jackets were attached. It was then shipped to the Tsukuba test center.

Unpacking of the optical bench

Unpacking of the optical bench

Storing the EOB in the vacuum chamber

Storing the EOB in the vacuum chamber

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