Abstract
The Far Infrared and Submillimeter Telescope (FIRST) is planned by ESA to be the successor of the successful Infrared Space Observatory (ISO) in the field of astronomic observations in the infrared and submillimeter wavelength range. At Dornier Satellitensysteme (DSS) the design of the FIRST Payload Module (PLM) has been established in several studies under ESTEC-contract, reflecting on the experience gained from ISO and former space-cryostat projects. This paper describes the actual design of the FIRST PLM which is mainly built up by the HeII-cryostat. This HeII-cryostat contains a 2560 l tank filled with superfluid Helium and three scientific instruments mounted on an Optical Bench which is fixed upon the HeII-tank. It is shown that all requirements are met and the FIRST-PLM will provide an excellent environment for the scientific instruments.
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