1. IDEE, The Electron Spectrometer for the Taranis Mission J.-A. Sauvaud 1, P. Devoto, A. Fedorov 1, G. Orttner 1, O. Chasselat 1, K. Wong 1, L. Prech 2, Z. Nemecek 2, 1 IRAP/CNRS-U. of Toulouse 2 Charles University, Prague Chibis international workshop, Tarusa, 13-15 february 2013

2. IDEE conception 3 objectives: - Pitch-angle Distribution of Radiation Belt Electrons (wave particle interactions) -Lightning-induced Electron Precipitation (LEP)‏ -Relativistic Runaway Electrons (RRE)

3. W= 3.5 eV/e - -hole pair The spectrometers uses semi-conductors as particle detectors The spectrometers uses semi-conductors as particle detectors DEMETER and TARANIS

4. WAVE PARTICLE INTERACTIONS 1. Cyclotron resonance

5. ELECTRON FLUXES AT 650 KM ALTITUDE (200 keV) Electron interaction with VLF NWC

6. ‘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’

7. Electrons Protons Drift resonance: ULF-particle INTERACTIONS

8. LIGHTENING ELECTRON PRECIPITATION / VLF-ELECTRON INTERACTION 2 s Voss et al, Nature, 1984.

10. Lightning induced electron precipitation (DEMETER - above Europe: weak energy, critical time resolution of electron data ) DEMETER

12. Distribution of lightnings, winter 2008-2009

13. ELECTRONS

14. Terrestrial gamma flashes energy spectrum RHESSI 10 msec Parent electrons: dJ/dE=2.2 10 -3 exp(-E/7.2) TGF Υ spectrum

15. Computed TGF Electrons Lehtinen et al., 2010; Carlson et al., 2011

16. Carlson et al., 2011

17. SAMPEX electron bursts possibly related to TGF Lehtinen et al.

18. DEMETER RRE Part/(cm2.s.sr.keV) Electron fluxes Expected TGF electrons The electrons that escape to satellie altitude are most likely secondary electrons produced by TGF

19. 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

20. The resulting IDEE sensor for TARANIS

21. IDEE 2 detector planes: Si + CdTe (coincidence for direction), large section of CdTe for RRE

22. ADDING SEPARATION INTO THE COLLIMATOR = angular separation of low energy electrons

26. Objectif - Runaway Relativistic Electrons Possible RRE spectrum (Red)‏ Where we can distinguish a RRE spectrum from the bkg electrons. (After DEMETER data)‏

27. Runaway Relativistic Electrons Possible RRE spectrum (Red)‏ Detection of RRE 8 horizontal bands, 8 CdTe cells in each thickness 6mm to stop electrons up to 4 Mev

28. IDEE-TARANIS

29. IDEE

32. CdTe

34. Response to RRE event Geant-4 simulation 20 counts/event Measurable signal for CdTe only

35. Response to associated Gamma rays Geant-4 simulation when gamma only are received, the measured signal is very weak. Gammas will not disturbed electron measurements.

36. STATUS OF THE EXPERIMENT Sensor head design: performed Electronic design: performed. ASIC developed DPU: performed (Charles university) Modes: defined Burst trigger: ready Thermal study: made EQM: made