The 4MOST instrument is a multi-object spectroscopic survey facility for the VISTA telescope at Paranal. The large multiplex gain for 4MOST is achieved by connecting over 2400 optical fibers from the telescope focal plane to three spectrographs. The final system features 812 fibers per spectrograph of around 25m in cable length. In addition, there are dedicated fiber cables for simultaneous calibration, for secondary guiding, and fiducial reference fibers for metrology. The fiber cable specifications, manufacture, assembly, and acceptance tests are described. Sub-system testing includes sparsely-populated fiber-slit-units, used for spectrograph alignment and performance verification and the fiber cable routing through the Cassegrain cable wrap.
The 4MOST1 instrument is a multi-object-spectrograph for the ESO-VISTA telescope. The 4MOST long fiber feed links the AESOP2 fiber positioner to two low-resolution spectrographs (1624 fibers) and one high-resolution spectrograph (812 fibers). In addition to the 2436 science fibers, the system includes guide fiber bundles, metrology fiducial fibers and simultaneous calibration fibers for the spectrographs. To validate the design approaches, including fiber connectors and cable rotator, pre-production fiber cables have been built and evaluated. This paper presents the near final design of the fiber feed subsystem and its performance results pertaining to throughput homogeneity, focal ratio degradation, and connector loss of the pre-production cables.
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