MAJIS Shutter QM and FM Thermo-vacuum Test Report
Date Issued
2023
Author(s)
Abstract
This test report provides a summary of the Thermo-Vacuum Test results on the QM and FM shutter units,
a mechanical part of the spectrometer MAJIS (Moon And Jupiter Imaging Spectrometer), a payload
instrument on board of the JUCE (JUpiter ICy moons Explorer) mission. The shutter actuator is composed
by an electromagnetic brushless actuator mounted with an aluminium blade. The aims of the actuator are
to maintain the blade in two stable positions (open and closed), to rotate the blade from one position to
other in a time less than 300ms and a low power consumption. These tests have been conducted to
demonstrate the capability of the shutter to operate according to requirements in vacuum at predefined
temperature conditions. The target temperatures for the QM model are Top-Min = 100K and Top-Max =
165K and pressures less than 1 mbar. A total number of thermo-vacuum cycles of 42 are requested,
including an extra hot point at 337K but only for the first cycle at the beginning. A slope of 2.7K/min has
been agreed and planned for all the cycles. For the life test, performed only on the QM1, selected as
reference, a total number of 1500 cycles at the same conditions of T and P are requested.
For what concerns the test performed on the FM model, the target temperature is Top-Min = 105K and
Top-Max = 160K.
A total number of thermo-vacuum cycles of 4 are requested, including an extra hot point at 337K but only
for the first cycle at the beginning. A slope of 2.7K/min has been agreed and planned for all the cycles.
Report number
240
Rights
open.access
File(s)![Thumbnail Image]()
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Name
ShutterMAJIS_rev.pdf
Description
Report
Size
2.36 MB
Format
Adobe PDF
Checksum (MD5)
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