Characterizing the response of Juno's JADE-E energy analyzers in the presence of Jupiter's strong magnetic field

Details Characterizing the response of Juno's JADE-E energy analyzers in the presence of Jupiter's strong magnetic field Characterizing the response of Juno's JADE-E energy analyzers in the presence of Jupiter's strong magnetic field

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13d2105c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13D-2105

Physics

[2756] Magnetospheric Physics / Planetary Magnetospheres, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

NASA's Juno mission, which is scheduled to launch this August, will be the first spacecraft to achieve polar orbit around Jupiter. The Jovian Auroral Distributions Experiment (JADE), onboard Juno, measures the full pitch angle distribution of electrons (JADE-E) and the 3D velocity-space distribution of ions and ion composition (JADE-I). JADE-E consists of three identical energy analyzers covering the range from ~0.1-100 keV. Below ~5keV and in the relatively strong Jovian magnetic field (up to ~8 G along the orbit) the gyro-radius of electrons is comparable to the radius of curvature of the analyzers. Therefore, the response at low energies will be strongly affected by the magnetic field. To better understand, predict, and correct for the response of JADE-E in the presence of Jupiter's strong magnetic field we are characterizing its response in the laboratory. A set of Helmholtz coils capable of producing a magnetic field up to about 9 G with three axis control was built around the vacuum test chamber. We also compare the laboratory measurements with electro-optics simulations. We will present both simulations and measurement results taken with the engineering model of JADE-E and discuss expected performance of the flight instruments when they arrive at Jupiter.

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