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| Titel |
Low energy high angular resolution neutral atom detection by means of micro-shuttering techniques: the BepiColombo SERENA/ELENA unit development |
| VerfasserIn |
S. Orsini, A. M. Di Lellis, A. Milillo, S. Selci, R. Leoni, I. Dandouras |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027914
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| Zusammenfassung |
| ELENA (Emitted Low-Energy Neutral Atoms) is a Time-of-Flight (ToF) system, based on
oscillating shutter (operated at frequencies up to a 100 kHz) and mechanical gratings devoted
to sputtering emission from planetary surfaces, from E ~20 eV up to E ~5 keV. This
new kind of low energetic neutral atoms instrument is one of the four units of the
SERENA experiment for the ESA cornerstone BepiColombo mission to Mercury.
The low energetic neutral particles that are likely to be detected by ELENA come
primarily from ion-sputtering process, and secondarily from back-scattering and
from charge exchange. ELENA will resolve intensity, velocity and direction of
the incoming particle flux: the entrance of the start section (an aperture of about 1
cm2consisting of two self-standing silicon nitride (Si3N4) membranes, patterned
with arrays of long and narrow openings) allows the impinging neutral particles
to enter through the shuttering system with a definite timing. Particles are then
flown in a ToF chamber, and finally detected by a 1-dimensional array composed by
MCPs and a discrete anodes set corresponding to a Field of View (FOV) of 4.5Ë
x76Ë , allowing the reconstruction of both velocity and direction of the incoming
events.
This poster will present the new results of the ELENA development in the frame of the
scientific items, instrument simulation, laboratory activity and testing. In particular, the
ELENA input section and shuttering system will be reported (new deflector system,
shuttering functionality test, membranes VUV optical proprieties and particle beam
interactions). |
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