Time-of-Flight Detector System with Low Background Performance for the IBEX-lo Sensor

Details Time-of-Flight Detector System with Low Background Performance for the IBEX-lo Sensor Time-of-Flight Detector System with Low Background Performance for the IBEX-lo Sensor

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh53b1492m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH53B-1492

Physics

2126 Heliosphere/Interstellar Medium Interactions, 2144 Interstellar Gas, 2151 Neutral Particles (7837), 2194 Instruments And Techniques

Scientific paper

Over the course of the IBEX Mission the IBEX-lo sensor will provide images of energetic neutral H atoms (ENA) from the termination shock in the energy range 10 2000 eV as well as the directional flow distribution of interstellar neutral O in spring and fall. The sensor combines a mechanical collimator to restrict the detectable arrival directions, an atom to negative ion conversion surface, an electrostatic analyzer, post-acceleration of up to 20 keV, and time-of-flight (TOF) mass analysis. In this combination the TOF system provides the necessary mass separation to distinguish different species and effective background suppression through coincidence detection techniques. Because the flux of the heliospheric ENAs is very low and generates rather low count rates a triple coincidence system is used with secondary electrons produced in two consecutive carbon foils, followed by the final detection of the ions in a micro-channelplate. These three signals are combined into three independent TOF measurements. A flight-like engineering test unit of the IBEX-lo TOF subsystem has been built and tested. Meanwhile the flight model of the sensor is in fabrication. It will be shown that the combination of several TOF measurements provides very effective means to suppress background and to identify minor species, whose fluxes are several orders of magnitude below the main species. Results from the testing of the engineering unit will be discussed in the light of the IBEX science objectives.

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