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Possible detection of heavy ENAs with IBEXHi
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Possible detection of heavy ENAs with IBEX-Hi ... Dunn, R. Ebert, D. J. McComas, I. Silva, J. Westlake, P. Valek, and the IBEX-Hi team ... – PowerPoint PPT presentation
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Title: Possible detection of heavy ENAs with IBEXHi
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Possible detection of heavy ENAs with IBEX-Hi
- F. Allegrini, J. Alquiza, T. Broiles, C. Dunn, R.
Ebert, D. J. McComas, I. Silva, J. Westlake, P.
Valek, and the IBEX-Hi team - SwRI
- UTSA
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IBEX In The Wild!
- ibex ahy beks noun any of several wild
goats of the genus Capra, inhabiting mountainous
regions of Eurasia and North Africa, having long,
recurved horns. - IBEX (Interstellar Boundary EXplorer) A
mission to explore the global interaction of our
heliosphere with the local interstellar medium.
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IBEX-Hi
Single 6.5x6.5 pixel ENA camera with 0.3ltElt6 keV
ENA
Ion Rejection collimator
Electron rejection
Detector section
Sunshade
C-Foil 2
SE
CEM C
SE
C-foil 1
SE
CEM A
CEM B
Conversion foil
70 lpi grid
Electrostatic Analyzer
H
Channel D not shown
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Detector Section
CEM C
- Triple (ABC) and double (AB, BC, AC) coincidences
- Coincidence window 100 ns
- Detector section at -6 kV
- For H (EM, center, normal incidence)
- 40 triples
- 60 doubles
CEM B
C-Foil 2 200 lpi 78
C-foil 1 200 lpi 78
CEM A
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EM observations
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EM observations
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Time-of-flight and long coincidence window
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Angular scattering
- At 1 keV 6 keV post-acceleration
- For H ?½ lt 8
- For He ?½ lt 16
- For O ?½ lt 42
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Concept
- Fraction of triples
- Mixed ENA source
- But
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Concept contd
- Detection when
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- Threshold
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Detection thresholds
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Detection thresholds
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Conclusions
- Detection of O (or other heavy) ENA possible
- Potential for detecting background generated
between collimator and CF - Calibrations measurement with oxygen recommended
- Identification of possible sources (Earth
magnetosphere, Jupiter, comets?)
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(No Transcript)
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Charge state of O after C-foil
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Charge state of C after C-foil
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