idee, the electron spectrometer for the taranis mission j.-a. sauvaud 1, p. devoto, a. fedorov 1, g....
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IDEE, The Electron Spectrometer for the Taranis Mission
J.-A. Sauvaud1, P. Devoto, A. Fedorov1, G. Orttner1,
O. Chasselat1, K. Wong1, L. Prech2, Z. Nemecek2,
1 IRAP/CNRS-U. of Toulouse
2 Charles University, Prague
Chibis international workshop, Tarusa, 13-15 february 2013
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IDEE conception
3 objectives:
-Pitch-angle Distribution of Radiation Belt Electrons (wave particle interactions)
-Lightning-induced Electron Precipitation (LEP)
-Relativistic Runaway Electrons (RRE)
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W= 3.5 eV/e--hole pair
The spectrometers uses semi-conductors as particle detectors
DEMETER and TARANIS
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WAVE PARTICLE INTERACTIONS
1. Cyclotron resonance
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ELECTRON FLUXES AT 650 KM ALTITUDE (200 keV)
Electron interaction with VLF
NWC
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‘Cyclotron’ induced structures
Sauvaud et al., 2008
Effect of VLF transmitter 19.8 kHz
Note the large difference of slopes in the inner belt as compared to the ‘cyclotron slope’
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Electrons Protons
Drift resonance: ULF-particle INTERACTIONS
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LIGHTENING ELECTRON PRECIPITATION / VLF-ELECTRON INTERACTION
2 s
Voss et al, Nature, 1984.
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Lightning induced electron precipitation (DEMETER - above Europe: weak energy, critical time resolution of electron data )
DEMETER
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Distribution of lightnings, winter 2008-2009
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ELECTRONS
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Terrestrial gamma flashes energy spectrum
RHESSI10 msec
Parent electrons:dJ/dE=2.2 10-3 exp(-E/7.2)
TGF
Υ spectrum
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Computed TGF Electrons
Lehtinen et al., 2010; Carlson et al., 2011
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Carlson et al., 2011
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SAMPEX electron bursts possibly related to TGF
Lehtinen et al.
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DEMETERRRE
Part
/(cm
2.s.
sr.k
eV)
Electron fluxes
Expected TGF electrons
The electrons that escape to satellie altitude are most likely secondary electrons produced by TGF
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Can a detector like IDP
(DEMETER) do that?
Relativistic Runaway Electrons (RRE) Not enough Geometrical Factor
Lightning-induced Electron Precipitation (LEP)Time resolution not adequate
Pitch-angle Distribution of Radiation Belt Electrons No angular channels
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The resulting IDEE sensor for TARANIS
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IDEE
2 detector planes: Si + CdTe (coincidence for direction), large section of CdTe for RRE
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ADDING SEPARATION INTO THE COLLIMATOR = angular separation of low energy electrons
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Objectif - Runaway Relativistic Electrons
Possible RRE spectrum (Red)
Where we can distinguish a RRE spectrum from the bkg electrons.
(After DEMETER data)
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Runaway Relativistic Electrons
Possible RRE spectrum (Red)Detection of RRE8 horizontal bands, 8 CdTe cells in eachthickness 6mm to stop electrons up to 4 Mev
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IDEE-TARANIS
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IDEE
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CdTe
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CdTe
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Response to RRE event
Geant-4 simulation20 counts/event
Measurable signalfor CdTe only
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Response to associated Gamma rays
Geant-4 simulation
when gamma onlyare received, the measured signal isvery weak.
Gammas will notdisturbed electronmeasurements.
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STATUS OF THE EXPERIMENT
Sensor head design: performed
Electronic design: performed. ASIC developedDPU: performed (Charles university)
Modes: defined
Burst trigger: ready
Thermal study: made
EQM: made