New Operational Modes of Linear-Electric-Field Time of Flight Telescopes

Details New Operational Modes of Linear-Electric-Field Time of Flight Telescopes New Operational Modes of Linear-Electric-Field Time of Flight Telescopes

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44b1734g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH44B-1734

Other

7594 Instruments And Techniques, 7599 General Or Miscellaneous, 7894 Instruments And Techniques

Scientific paper

In situ measurements of space plasma have greatly improved our understanding of the space environment. For example, ion mass spectrometers that use electrostatic analyzers and time-of-flight systems enable researchers to identify revealing characteristics of ions in the solar wind. Using an optimized design of a linear-electric-field time-of-flight system, combined with a tophat electrostatic analyzer, we measure ions and make comparisons of resolution for both single and double-microchannel plate (MCP) configurations. The double-MCP design uses one MCP to detect straight-through particles and another to detect positive ions that experience isochronous time of flight. High mass resolution can be obtained because the isochronous ions are separated from their straight- through counterparts. In the single-MCP design, an isochronous ion will impact an emitting plate and send a secondary electron to the straight-through MCP. By focusing these secondary electrons and using position- sensitive detection, their signal can still be separated from particles that do not experience isochronous motion, thereby maintaining a high mass resolution. We also examine the ability to distinguish between molecules of similar mass, N2+ and CO+, by studying their atomic daughter products after breakup through a thin carbon foil.

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