Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling and Performance of Contact-Free Discharge Systems for Space
  Inertial Sensors   This article presents a detailed overview and assessment of contact-free UV
light discharge systems (UVDS) needed to control the variable electric charge
level of free-flying test masses which are part of high precision inertial
sensors in space. A comprehensive numerical analysis approach on the basis of
experimental data is detailed. This includes UV light ray tracing, the
computation of time variant electric fields inside the complex inertial sensor
geometry, and the simulation of individual photo-electron trajectories.
Subsequent data analysis allows to determine key parameters to set up an
analytical discharge model. Such a model is an essential system engineering
tool needed for requirement breakdown and subsystem specification, performance
budgeting, on-board charge control software development, and instrument
modeling within spacecraft end-to-end performance simulators. Different types
of UVDS design concepts are presented and assessed regarding their robustness
and performance. Critical hardware aspects like electron emission from
air-contaminated surfaces, interfaces with other subsystems, and spacecraft
operations are considered. The focus is on the modeling and performance
evaluation of the existing UVDS on board LISA Pathfinder, an ESA technology
demonstrator spacecraft to be launched in 2014. The results have motivated the
design of a more robust discharge system concept for cubical test mass inertial
sensors for future space missions. The developed analysis tools have been used
for design optimization and performance assessment of the proposed design. A
significant improvement of relevant robustness and performance figures has been
achieved.

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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-lat