MAJIS/JUICE VIS-NIR FM and SM detectors characterization

Cisneros-González, Miriam E.; Bolsée, David; Pereira, Nuno; Laeken, Lionel Van; Depiesse, C.; Jacobs, Lars; Robert, Séverine; Vandaele, Ann Carine; Gissot, S.; Karatekin, Özgür; Poulet, F.; Langevin, Y.; Dumesnil, C.; Dubois, Jean Pierre; Arondel, Antoine; Haffoud, Paolo; Ketchazo, Christian; Hervier, V.; Crane, B.

doi:10.1117/12.2562063

Cited by 1 publication

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“…Consequently, after a position change of the movable plate, it is necessary to change the thermalization of the copper plate accordingly and wait at least 2 h for the temperature to stabilize (AE0.5 K from target temperature). 38 The cooling-down and warming-up processes were defined during the validation phase. Figure 7 shows the vacuum and temperature evolution of the cryogenic system with no detector installed in the mount.…”

Section: Cryogenic Systemmentioning

confidence: 99%

“…However, to compensate for the temperature increase of the detector, the copper plate was thermalized 1.6 K below its nominal temperature. Consequently, after a position change of the movable plate, it is necessary to change the thermalization of the copper plate accordingly and wait at least 2 h for the temperature to stabilize (±0.5 K from target temperature) 38 …”

Section: Subsystems Validationmentioning

confidence: 99%

“…If the vacuum level increases to 10−2 mbar, the turbopump can no longer be activated. However, no contamination is expected even if the detector returns to room temperature because as soon as the turbopump is activated again, the mount and the detector will release the trapped molecules during their passive warming-up, and once the cryocooler is activated these molecules will be trapped again by the cold head 38 . In case such an event takes place, a reaction time of less than an hour is expected from the personnel in charge of the facility.…”

Section: Subsystems Validationmentioning

confidence: 99%

“…Measuring the level of straylight inside the radiation shield requires the mount at cryogenic temperatures and the detector under dark conditions, so the photon flux reaching the detector is only due to thermal emission around it. This validation was a process performed during the characterization campaigns of the MAJIS VIS-NIR detectors 31 , 38 and meant the improvements performed between campaigns. The main modifications from the original design were related to the baffling system of the slit of the movable plate and the main flexible thermal link between the movable plate and the radiation shield.…”

Section: Subsystems Validationmentioning

confidence: 99%

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Facility for the radiometric characterization of space-based visible-near infrared detectors

Cisneros-González,

Bolsée,

Pereira

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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When developing new astronomical instruments, there is a need to perform the characterization of their individual components, especially the detectors, to ensure that their performances comply with the scientific objectives of the instrument. A visiblenear infrared (VIS-NIR) facility was developed for the absolute and relative radiometric characterization of space-based detectors at the Royal Belgian Institute for Space Aeronomy (BIRA-IASB). The facility operates from 0.4 to 2.65 μm in an ISO-5 environment. It offers a tunable monochromatic flux with a high level of straylight rejection (10 −8 ) and 2% uniformity, over a four-decade range of intensity with adjustable bandwidth. Latency measurements are also possible. Thermalization is offered within a precision of 7 mK between 50 K and 382 K. The ultimate vacuum level of the detector chamber is below 10 −6 mbar. A robust security system avoids both reaching temperatures outside the operational range of the detector and its electronics, and contamination due to vacuum loss. The facility was already used to characterize the VIS-NIR detectors of the Moons And Jupiter Imaging Spectrometer (MAJIS), one of the instruments on board the Jupiter ICy Moons Explorer (JUICE). The versatility provided by the VIS-NIR facility allows its use for the characterization of other astronomical detectors.

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Section: Cryogenic Systemmentioning

confidence: 99%