Solar Power System Design for the Solar Probe+ Mission

Landis, Geoffrey A.; Schmitz, Paul; Kinnison, James D.; Fraeman, Martin E.; Roufberg, Lew; Vernon, Steve; Wirzburger, M.

doi:10.2514/6.2008-5712

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…A screen-printed 12 µm thick single layer of platinum has a sheet resistance of about 70 mΩ/sq according to initial measurements, and 60.1 ± 19.8 mΩ/sq according to [6]. Silver, having a resistivity of 15 % of that of platinum [23], is here assumed to have a sheet resistance of 11 mΩ/sq for a single layer of the same thickness.…”

Section: Theorymentioning

confidence: 99%

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Ceramic Pressure Sensor for High Temperatures – Investigation of the Effect of Metallization on Read Range

et al. 2017

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A first realization of membranes by draping a graphite insert with ceramic green body sheets, and a study on the relationship between circuit metallization, made by doublelayer screen-printing of platinum and electroplating of silver on top of platinum, and the practical read range of ceramic LC resonators for high-temperature pressure measurements, are presented. As a quality factor reference, two-port microstrip meander devices were positively evaluated. To study interdiffusion between silver and platinum, test samples were annealed at 500, 700, and 900 °C for 4, 36, 72, and 96 hours. The LC resonators were fabricated with both metallization methods, and the practical read range at room temperature was evaluated. Pressure sensitive membranes were characterized for pressures up to 2.5 bar at room temperature, 500 and up to 900°C. Samples electroplated with silver exhibited performance equal to or better than double-layer platinum samples for up to 60 hours at 500°C, 20 hours at 700°C, and for 1 hour at 900°C, which was correlated with the degree of interdiffusion as determined from crosssectional analysis. The LC resonator samples with double-layer platinum exhibited a read range of 61 mm, and the samples with platinum and silver exhibited a read range of 59 mm. The lowest sheet resistance, and, thereby, the highest read range of 86 mm, was obtained with a silver electroplated LC resonator sample after 36 hours of annealing at 500°C.

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Section: Theorymentioning

confidence: 99%

“…Challenges for space vehicles have been addressed for a long time, [4], where the pressure in launch boosters with liquid propellants can reach about 7 bar and the temperature can exceed 1000 °C. Also, future near-sun missions, that require hardware able to sustain at least 850 °C, are being planned and studied [5][6].…”

Section: Introductionmentioning

confidence: 99%

Ceramic Pressure Sensor for High Temperatures – Investigation of the Effect of Metallization on Read Range

et al. 2017

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“…Present and future NASA solar system missions [1] will operate spacecraft at distances from the sun ranging from the upcoming JUNO mission [2], operating in the lowtemperature, low-intensity environment at the orbit of Jupiter, 5.4 Astronomical Units from the Sun, all the way to the upcoming Solar Probe Plus mission to investigate the outer corona of the sun [3,4], which will operate through the high-temperature, high intensity environment at distances less than one-twentieth of an astronomical unit from the sun. These missions will operate solar arrays at a wide range of temperatures and solar intensity, and hence it is of interest to understand the effect of both intensity and temperature on solar cell performance.…”

Section: Introductionmentioning

confidence: 99%

Temperature coefficient of multijunction space solar cells as a function of concentration

Landis

Belgiovane

Scheiman

2011

2011 37th IEEE Photovoltaic Specialists Conference

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Measurements of multijunction space solar cells were taken as a function of temperature for low intensity operation (down to 0.02 suns), and also at high intensities (up to 60 suns). Cells from two vendors were tested. The effect of intensity on the measured temperature coefficient was analyzed. The temperature coefficient of the short circuit current was directly proportional to the intensity, while the temperature coefficient of the open circuit current decreased proportionally to the open circuit voltage. Commercial triple-junction space cells were tested to temperatures as high as 400°C, showing a slight deviation from linear performance but no catastrophic degradation.

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“…In 2007, NASA tasked the Applied Physics Laboratory to conduct a study to determine the feasibility of a lower-cost, non-nuclear mission that would achieve the Solar Probe science objectives. [1,2] APL partnered with Glenn Research Center to perform a trade study to develop a concept for power generation during encounter [3]. The resulting concept was integrated into the overall APL power system design, resulting in a spacecraft able to meet the challenges of the environment [2].…”

mentioning

confidence: 99%

Testing of solar cells for the Solar Probe Plus mission

Scheiman

Piszczor

Snyder

et al. 2011

2011 37th IEEE Photovoltaic Specialists Conference

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The Solar Probe Plus (SPP) is an upcoming mission in NASA's "Living with a Star Program" to be built by the Johns Hopkins University Applied Physics Laboratory. The spacecraft will orbit the sun for a primary mission duration of seven years, making a closest approach to the sun at a distance of 0.0442 AU. Instrumentation on SPP will focus on two primary science investigations: the sun's coronal heating and solar wind acceleration, and the production, evolution, and transport of solar energetic particles. The mission is scheduled for a launch no later than 2018. The spacecraft will have a thermal shield to protect the main portions of the spacecraft from the solar irradiance, and is powered by a pair of solar array wings. Each wing is actively cooled, and sectioned into a primary array for normal orbital operations, with a secondary for operation at high solar intensity during closest approach to the sun. Near the sun, the arrays are tilted at a high angle, withdrawing the primary array section behind the thermal shield and exposing only the secondary section, which is in the penumbra of the thermal shield to minimize the operating temperature. This secondary section will experience environmental conditions that include high solar flux, radiation, high temperature, and off-normal light incidence. It will use solar cells based on the state-of-theart triple junction solar cells (InGaP/GaAs/Ge) for space with modifications to handle the higher irradiance and temperature. NASA Glenn Research Center tested prephase A solar cells for the secondary (high irradiance) section under a variety of conditions which include temperatures up to 150°C at 1 sun and 40X concentration. These measurements were made before and after irradiations that include 1 and 3.3 MeV electrons, 1, 4, and 10 MeV protons at two different fluencies. Additional testing included off-angle performance, extended temperature exposure, and UV exposure. BACKGROUND

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Solar Power System Design for the Solar Probe+ Mission

Cited by 10 publications

References 15 publications

Ceramic Pressure Sensor for High Temperatures – Investigation of the Effect of Metallization on Read Range

Ceramic Pressure Sensor for High Temperatures – Investigation of the Effect of Metallization on Read Range

Temperature coefficient of multijunction space solar cells as a function of concentration

Testing of solar cells for the Solar Probe Plus mission

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