Objective: The objective of the activity is to allow Power Processing Unit (PPU) switch on as quickly as possible after spacecraft separation.
Targeted Improvements: To avoid long drifts during mission phases (days).
Description: High power units like PPUs havethe risk of Corona at first start-up if the pressure is too high. Traditionally, such units are therefore only switched on after several days of depressurization and outgassing. With full electric orbit raising, there is a need to start PPUs within a few hours after separation, in order to start the electric orbit raising as early as possible. The days of depressurisation and outgassing lead to a decay of the spacecraft's orbit while waiting for the operational requirements to be met for switching on the plasmic propulsion.
After choosing a EOR missions profile and a PPU existing design, it is proposed to define the conditions (temperature, pressure,etc.) required to switch-on the PPU as early as possible after separation, without Corona.
The proposed work logic is: