Europa Clipper Magboom Deployment Thermal Design and Deployment Sequence

Date

7/10/2022

Journal Title

Journal ISSN

Volume Title

Publisher

51st International Conference on Environmental Systems

Abstract

Europa Clipper, a mission to Europa (the fourth largest moon of Jupiter), is equipped with selected scientific instruments, including Europa Clipper Magnetometer (ECM). The ECM subsystem consists of three fluxgate assemblies, designed and fabricated in collaboration between JPL and UCLA and a deployable Magboom, designed and supplied by Northrop Grumman (NG) Goleta. Each fluxgate assembly will be installed on the lower ring, mid-ring and the tip-plate, respectively. 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 the deployment. At the time of deployment (15 to 30 days after launch), the temperature of the Magboom harness needs to be raised to above its allowable flight temperature of -5�C to reduce the Magboom harness stiffness. At this temperature value, Magboom Kickover springs are able to provide enough force (with above 100% margin of safety) to kick the Magboom harness.
There are 5 film heaters on the Magboom canister which will be used once only for deployment. There is a complicated thermal path including mast, a thermal sock and harness insulation, between the heaters and the harness. This paper describes a detailed design of the heaters for Magboom canister pre-heating prior to deployment and deployment sequence. While at the maximum bus voltage of 32.8V, maximum peak power is at 197W only for less than 30 minutes, the average heater power consumption remains at 111W when heaters start cycling. Resizing the heaters provided 56% duty cycle at the maximum voltage of 32.8V and 87% duty cycle at the minimum voltage of 27.8V. As a result, this robust design limits Magboom thermal verification and validation to �by analysis only�.

Description

Elham Maghsoudi, NASA Jet Propulsion Laboratory, US
Caroline Racho, NASA Jet Propulsion Laboratory, US
Jonathan Jones, NASA Jet Propulsion Laboratory, US
Scotty Allen, Northrop Grumman Goleta, US
ICES101: Spacecraft and Instrument Thermal Systems
The 51st International Conference on Environmental Systems was held in Saint Paul, Minnesota, US, on 10 July 2022 through 14 July 2022.

Keywords

Europa Clipper Magnetometer Magboom, ECM, Deployment thermal design

Citation