Development of a 3Pi Ion Spectrometer, 15-9468Printer Friendly Version
Inclusive Dates: 04/01/04 - Current
Background - The current techniques used to make in situ measurements of space plasmas share a limitation in their field of view. The largest field of view of a single sensor yet flown is that of a "top hat" analyzer. The top hat analyzer can view a ring that encompasses 10 degrees of elevation and 360 degrees about its azimuth, allowing an instantaneous viewing of less than 10 percent of the plasma spatial distribution. To cover the total plasma distribution with such a limited field of view requires either scanning or multiple sensors. Either of these approaches requires more resources than would a single instrument with a larger field of view.
Approach - To better complete the measurements outlined above, we are developing a prototype instrument with an instantaneous field of view of 75 percent of space, or 3Pi steradians. We have divided our project into three challenges.
Accomplishments - We have nearly accomplished Challenge 1. Multiple electro-optic configurations have been defined, each capable of viewing 3Pi steradians. Selected configurations have been iteratively modeled and ray traced to test the actual angular response and to optimize the electrodes used. We are in the final phase of selection of the specific electro-optical design for the physical prototype.
We have done some limited preparatory work to ensure we will be ready to fabricate our prototype (Challenge 2) after our design is finalized.
We have begun work for Challenge 3. Our work on electro-optical design led naturally to extensive discussions of how to incorporate the optics into a full sensor capable of making mass and energy measurements. In addition, our design phase has produced multiple configurations that meet our requirement for 3Pi steradian viewing, and we have already been engaged in some detailed discussion of how these different configurations would allow us to respond to different mission opportunities. We have identified key missions in which SwRI will have a definite competitive advantage.