Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33b2067b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH33B-2067
Physics
Plasma Physics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7833] Space Plasma Physics / Mathematical And Numerical Techniques, [7867] Space Plasma Physics / Wave/Particle Interactions, [7894] Space Plasma Physics / Instruments And Techniques
Scientific paper
In preparation for the launch of Solar Orbiter in 2017 or 2018, we have begun development of the Heavy Ion Sensor (HIS) as a part of the Solar Wind Analyzer (SWA) instrument suite. HIS is capable of making full three-dimensional distribution measurements of the heavy ion population in the solar wind every 5 minutes. Specifically, it does this by differentiating the solar wind into energy-per-charge bins, using an electrostatic analyzer (ESA), then flying the particle through a time-of-flight (TOF) chamber to measure their speeds, and finally collecting the particles in a solid-state detector (SSD) to measure the particles' final energy. The particles interact with carbon foils at the start and end of the TOF chamber and in the dead layer of the SSD, creating uncertainty in the measurement of TOF and energy. This uncertainty can be estimated through the Stopping and Range of Ions in Matter (SRIM) simulations. Additionally, the SSD is unlikely to observe the full kinetic energy of heavy ions due to the pulse height defect and electronic noise. In our Monte Carlo simulation, we characterize the PHD by an average energy loss [Daoudi et al., 2009] and a spread of the observed energy distribution, which are both mass and initial energy dependent. Monte Carlo simulation provides a fast and low cost methodology to develop the instrument and characterize its predicted behavior under varying solar wind conditions.
Broiles T. W.
Livi Stefano A.
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