Development Of A Fast Neutron Imaging Telescope (FNIT) For The Inner Heliosphere

Astronomy and Astrophysics – Astronomy

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We discuss the development of a Fast Neutron Imaging Telescope (FNIT), which will have the ability to detect and image solar neutrons in the 2-20 MeV energy range. One of the uses of the FNIT instrument will be to measure the neutron spectrum that is emitted during solar flares and could provide insight into understanding some of the unanswered questions involved with flares, such as the processes responsible for particle acceleration. Since a large part of the neutrons from the Sun in this energy range decay before they reach Earth's orbit, it would be advantageous to place the detector in orbit at 0.3 AU around the Sun. Thus a goal of this project has been to construct a modular neutron telescope and would be a candidate instrument for the Inner Heliosphere Sentinels (IHS) program. The FNIT design is currently in Science Model 1 phase (SM1), which consists of three organic scintillating plates, stacked 4.5 cm apart. For neutron imaging, we require at least a double scatter of fast neutrons off ambient protons within the scintillator and measure the energy of the recoil proton and scattered neutron, the timing difference between interaction, and location on the plate of each interaction. This information will allow us to reconstruct the event and identify sources. Preliminary testing of SM1 shows that a neutron signature can be seen with a source present above and below the detector. This work is supported in part by the U.S Department of Energy under Contract DE-FG52-04NA25687 and NASA under grant NAG5-13519.

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