IDEE, The Electron Spectrometer for the Taranis Mission J.-A. Sauvaud 1, P. Devoto, A. Fedorov 1, G....
-
Upload
aubrie-fox -
Category
Documents
-
view
216 -
download
0
Transcript of IDEE, The Electron Spectrometer for the Taranis Mission J.-A. Sauvaud 1, P. Devoto, A. Fedorov 1, G....
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
IDEE conception
3 objectives:
-Pitch-angle Distribution of Radiation Belt Electrons (wave particle interactions)
-Lightning-induced Electron Precipitation (LEP)
-Relativistic Runaway Electrons (RRE)
W= 3.5 eV/e--hole pair
The spectrometers uses semi-conductors as particle detectors
DEMETER and TARANIS
WAVE PARTICLE INTERACTIONS
1. Cyclotron resonance
ELECTRON FLUXES AT 650 KM ALTITUDE (200 keV)
Electron interaction with VLF
NWC
‘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’
Electrons Protons
Drift resonance: ULF-particle INTERACTIONS
LIGHTENING ELECTRON PRECIPITATION / VLF-ELECTRON INTERACTION
2 s
Voss et al, Nature, 1984.
Lightning induced electron precipitation (DEMETER - above Europe: weak energy, critical time resolution of electron data )
DEMETER
Distribution of lightnings, winter 2008-2009
ELECTRONS
Terrestrial gamma flashes energy spectrum
RHESSI10 msec
Parent electrons:dJ/dE=2.2 10-3 exp(-E/7.2)
TGF
Υ spectrum
Computed TGF Electrons
Lehtinen et al., 2010; Carlson et al., 2011
Carlson et al., 2011
SAMPEX electron bursts possibly related to TGF
Lehtinen et al.
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
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
The resulting IDEE sensor for TARANIS
IDEE
2 detector planes: Si + CdTe (coincidence for direction), large section of CdTe for RRE
ADDING SEPARATION INTO THE COLLIMATOR = angular separation of low energy electrons
Objectif - Runaway Relativistic Electrons
Possible RRE spectrum (Red)
Where we can distinguish a RRE spectrum from the bkg electrons.
(After DEMETER data)
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
IDEE-TARANIS
IDEE
CdTe
CdTe
Response to RRE event
Geant-4 simulation20 counts/event
Measurable signalfor CdTe only
Response to associated Gamma rays
Geant-4 simulation
when gamma onlyare received, the measured signal isvery weak.
Gammas will notdisturbed electronmeasurements.
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