Europa Clipper Magboom Deployment Thermal Design and Deployment Sequence

This paper describes a detailed design of the heaters for Magboom canister pre-heating prior to deployment and deployment sequence. Prior to deployment, Magboom is in stowed configuration with the harness, mast and longerons stacked inside it. Deployment process is passive where kick-over springs will be used to push the harness and structure out of the canister at the time of deployment. At that point, the temperature of the Magboom harness needs to be raised to above its allowable flight temperature of -5ºC to reduce the Magboom harness stiffness. A complicated thermal path exists between the heaters and the harness. This thermal path includes mast, a thermal sock and harness insulation. This paper describes a detailed design of the heaters for Magboom canister pre-heating prior to deployment and deployment sequence. A maximum 197W of heater power was requested from Clipper spacecraft. While at the maximum bus voltage of 32.8V, maximum peak power is at 197W for less than 30 minutes. The average heater power consumption remains at 111W while heaters start cycling. As a result, this robust design limits Magboom thermal verification and validation to “by analysis only”.