LFI End of Life Activities Definition

Abstract

This document describes the activities to be performed on LFI at the End of Life of the Planck satellite. The starting condition of LFI is considered to be “Nominal”.

The aim of this document is to describe in detail the operations that are required to be performed at the End of Life on LFI. Each activity is ultimately broken down to the procedure level, and all inputs are defined. The starting conditions for each activity stage are defined, as well as the activity constraints and conditions, for example the temperature range within which the activity shall be performed. Due to the complexity of some (tuning) activities, the MOC operations will be pre-prepared using proprietary application that will construct a Manual Stack with all of the commands specific to the particular ‘tuning activity’ of an activity stage. The commands for some tuning activities will be time-tagged, and will execute from the on-board MTL. This allows the activities to be controlled more efficiently, and of course accommodates the long duration execution of some activities. The commanding activities for a particular stage may involve both real-time command execution, together with MTL commanding. In all cases the complete activity stage will be prepared in advance. The ‘commanding products’ produced prior to each activity stage will be sent to LFI for formal approval prior to uplink.