Effects of non-ideal biased grids on geophysical parameters obtained from RPA data

Details Effects of non-ideal biased grids on geophysical parameters obtained from RPA data Effects of non-ideal biased grids on geophysical parameters obtained from RPA data

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11b1628k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11B-1628

Computer Science

Performance

2494 Instruments And Techniques, 7894 Instruments And Techniques

Scientific paper

The use of biased grids as energy filters for charged particles has been a common practice in satellite-borne instruments such as the retarding potential analyzer (RPA). It has been shown previously that the use of biased grids in such instruments creates a non-uniform potential in the grid plane, which leads to errors in inferred geophysical parameters including velocity, temperature, and composition. A simulation of ion interactions with a number of configurations of biased grids has been developed using a commercial finite- element analysis software package. Using a statistical approach, the simulation calculates collected flux from Maxwellian ion distributions with 3D drift relative to the instrument. Perturbations in the performance of flight instrumentation relative to expectations from the idealized RPA flux equation are discussed. Both single-grid and double-grid systems are modeled to investigate design considerations. Relative errors in the inferred parameters are characterized as functions of ion composition, temperature, and drift velocity.

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