The FIRST-PLM based on a HeII-cryostat

Schupp, J.; Moßbacher, B.; Seidel, A.

doi:10.1016/s0011-2275(99)00011-9

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“…For further details of the PLM design see also reference(6 DESCRIPTION OF THE CURRENT DEFINITION OF THE PAYLOAD MODULEThe FIRST PLM consists in its main part of the Cryostat (seefigure 8).…”

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<title>FIRST payload module and accommodation of instruments</title>

et al. 2000

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FIRST (Far Infrared and Sub-millimetre Telescope) is one of the satellites of the next ESA scientific mission.FIRSTJP1anck, which will be launched in 2007 to the 2nd Lagrangian libration point L2.It will be a multi-user observatory, watching the universe in the infrared and sub-millimetre wavelength range from 60 to 670 m.The payload Module (PLM) of FIRST will accommodate 3 instruments built by large scientific consortia: SPIRE (Spectral and Photometric imaging REceiver), PACS (Photo-conductor Array Camera & Spectrometer), and H1FI (Heterodyne Instrument for First). All of them have detectors or mixers operating in the range 0.3 K-2 K. It must also support a 3.5 mdiameter telescope. The design of the payload module is inspired from the one of ISO (Infrared Space Observatory). It is based on a large superfluid helium (Hell) Dewar (2560 1 at 1.7 K), with cooling of the instruments either directly on the tank, or on the helium vent line (4 K and 15 K). The last cooling stage to 0.3 K is performed inside the instruments using a recyclable 3He-sorption cooler.The paper will describe the latest design status of the crvostat, and its interfaces to the instruments and the telescope. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/29/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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