Contamination measurements during the operation of hydrazine thrusters on the P78-2 /SCATHA/ satellite

Carre, D. J.; Hall, D. F.

doi:10.2514/6.1982-79

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Using the calculated hydrazine flux on the head and the planned mission thruster profile during TAG, the team derived the total hydrazine fluence on the TAGSAM head. The analysis also utilized the following reasonable assumptions: condensation temperature of hydrazine in vacuum is -108°C; the TAGSAM head will be warmer than -108°C for the TAG maneuvers; for any deposited hydrazine on clean head (prior to first TAG), all hydrazine will leave the TAGSAM surface because of TAGSAM surface temperatures (Chirivella 1975;Carré and Hall 1983); and after first TAG, the team assumed 100% sticking coefficient. The last assumption implies all hydrazine deposited on the head stays on the head and is available to contaminate the sample.…”

Section: Hydrazinementioning

confidence: 99%

OSIRIS-REx Contamination Control Strategy and Implementation

et al. 2017

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OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This article describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS- REx spacecraft sampling hardware was maintained at level 100 A/2 and <180 ng/cm2 of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication among scientists, engineers, managers, and technicians.Comment: 75 pages, 28 figures, 2 supplements, accepted for publication in Space Science Review

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Section: Hydrazinementioning

confidence: 99%

OSIRIS-REx Contamination Control Strategy and Implementation

et al. 2017

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“…During previous analyses of contamination of the payload by thruster firing it was always assumed that fuel droplets staying on the nozzles give the main contribution to the contamination of the payload. 6 In Ref. 6 the authors describe a detection limit of 8 ng cm -2 .…”

Section: Long Term Effectsmentioning

confidence: 99%