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The project 4MOST at CRAL

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CRAL has been involved since 2014 in the design, assembly and tests of the two Low Resolution Spectrographs. The project is now fully in the final design phase, with the FDR foreseen early in 2018.

4MOST (4-metre Multi-Object Spectroscopic Telescope) is a major new wide-field high-multiplex spectroscopic survey facility currently being designed for the VISTA telescope of ESO, with a first light foreseen in 2022.

4MOST has a broad range of science goals ranging from galactic archaeology and stellar physics to the high-energy physics, galaxy evolution, and cosmology. 4MOST will deploy 2436 fibres in a 4.1 square degree field-of-view using a positioner based on the tilting spine principle. The fibres will feed one high-resolution (R 20,000) and two medium-resolution (R 5000) spectrographs with fixed 3-channel designs and identical 6K x 6K CCD detectors. 4MOST will have a unique operation concept, in which 5-year public surveys both from the 4MOST Consortium and the ESO community will be combined and observed in parallel during each exposure. The 4MOST Facility Simulator (4FS) was developed to demonstrate the feasibility of this observing concept, showing that we can expect to observe above 50 million objects in the entire survey period and will eventually be used to plan and conduct the actual survey.

The 4MOST team @ CRAL is composed of the following members:

  • Patrick CAILLIER, Local Project Manager (until Januray 2019)
  • Alban Remilleux, Local Project Manager (from February 2019)
  • Johan RICHARD, Local Responsible Scientist, Co-PI of the 4MOST Cosmology Survey
  • Florence LAURENT, Optical designer
  • Karen DISSEAU, CDD engineer
  • Diane CHAPUIS, CDD engineer
  • Jean-Emmanuel MIGNIAU, Mechanical designer
  • Didier BOUDON, Mechanical designer and AIT mechanics
  • Eric DAGUISÉ, FEM computing mechanical engineer
  • Arlette PÉCONTAL, software engineer
  • Aurélien JARNO, AIT electronics
  • Laurence TRESSE, 4MOST Executive Board member


View online : Web page of the 4MOST Consortium