4MOST - 4-metre Multi-Object Spectroscopic Telescope
4-m Multi-Object Spectroscopic Telescope

LRS-A Local Acceptance Review

A team from the 4MOST Project Office visited CRAL on 15-16 December 2021 to conduct the Local Acceptance Review (LAR) for the first Low-Resolution Spectrograph (LRS-A). The purpose of the LAR is to assess whether a subsystem is mature and complete before shipping it to the AIP for integration. During the weeks prior to the physical meeting, the deliverable documentation was submitted and reviewed, resulting in a set of comments and questions. At the two-day LAR meeting in Lyon the technical performance and cost were reviewed, the hardware was inspected, the instrument was operated using engineering GUIs, and more. 4MOST project members from MPIA and ESO also participated remotely.

In general, the performance of LRS-A was found to be excellent and no major issues were identified. Issues related to documentation and product assurance are well advanced and on par with expectations at this stage of the project. A list of Action Items has been produced as a result of the LAR. The plan is now for LRS-A to be shipped to Potsdam sometime in Q1 of 2022, with the exact date depending on other system integration activities.

The Project Office wishes to thank the LRS team at CRAL for their dedicated and competent work and superb collaboration. We are already now looking forward to coming back to Lyon when LRS-B is finished!


The CRAL and Project Office teams in front of LRS-A in the clean-room. The spectrograph is visible behind the blue airlock. From left to right: Jean-Emmanuel Migniau, Florence Laurent, Karen Disseau, Joar Brynnel, Olga Bellido, Domenico Giannone, Didier Boudon, Aida Ezzati-Amini, Aurelien Jarno, Alban Remillieux, Diana Johl. Other LRS team members not in the picture: Diane Chapuis, Eric Daguisé, Alexandre Jeanneau, Arlette Pécontal, Emmanuel Pécontal, Johan Richard.

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