HIGH ENERGY POSITRON DETECTION VIA SYNCHROTRON RADIATION IN MAGENTOSPHERE “SONYA” project А.М. Гальпер 1, О.Ф. Прилуцкий 2, С.В. Колдашов 1, В.В. Михайлов.

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HIGH ENERGY POSITRON DETECTION VIA SYNCHROTRON RADIATION IN MAGENTOSPHERE “SONYA” project А.М. Гальпер 1, О.Ф. Прилуцкий 2, С.В. Колдашов 1, В.В. Михайлов 1 1 Национальный исследовательский ядерный университет МИФИ 2 Институт космических исследований РАН A.M. Galper. O.F. Priluchkii, S.V. Koladashov, V.V. Mikhailov Presented by Vladimir Mikhailov 12 October, 2 sd ICPPA, 2016, Moscow, MEPHI

Positron fraction e + /(e + +e - ) in Galactic Cosmic Ray Nature, 2009

(Moskalenko & Strong 1998) GALPROP code Plain diffusion model Interstellar spectra Positron fraction Secondary Production Models CR + ISM   ± + …   ± + …  e ± + … CR + ISM   0 + …    e ± Dark matter? Pulsars? SNR? There is a source of primary positrons in CR

Measurements with AMS02 magnetic spectrometer At present AMS-02 extended measurements till ~500 GeV. AMS-02 M. Aguilar, et al., Phys. Rev. Lett. 110 (2013) Figure from O. Adriani, et al. Physics Reports, 2014,

Positron fraction with DM source: an example Physics Letters B 728 (2014) 250–255

Magnetic spectrometer technique At high energy dominant background is due to spillover events Finite deflection resolution of tracker  wrong assignment of charge-sign & high energy The AMS-02 MDR is about 2 TV, a very high value with respect to similar experiments. AMS-02 magnetic spectrometer Problems with MDR increasing

Prilutshkii idea (1972) Detection of co-linear simultaneous X-ray photons in the detector Advantages: increase of the effective area of the instrument proton background rejection factor ~10 6 possibility to reduce spillover till ~hundreds TV Challenges: background from CR

CREST EXPERIMENT Nahee Park, ICRC days balloon flight in Antarctica

Good event Coincidence events Horizontal passing of charge particlesInteraction inside detector Nahee Park, ICRC 2013 Atmospheric background events were too large

Prototype SRD test flight on board STS-108 H. Anderhub+, Nucl Phys 2002, 113,166 B. Zimmerman, 2003, ETZH SRD principle works in blue region Small prototype of SRD with YAP (Ce) scitillator crystals 18x18X1 mm 12 days flight in Yttrium Aluminum Perovskite activated by Ce3+

Positron detection X-ray photons Relative position of synchrotron photons and primary particle is signature for e+ and e-

Simulation of particles trajectories in magnetosphere Examples of trajectory calculations into geomagnetic field near cut-off rigidity. Trajectories of positrons and electrons were reconstructed in the Earth's magnetic field. IGRF field model was used Altitude distribution of emitted photons for 1 TeV electrons Altitude, km Number of photons

Project SONYA Task: Measurements energy spectra of cosmic ray electrons and positrons of very high energy form handreds GeV till TeV using SR method Object : to study origin of high energy positron excess and DM properties Scheme of the instrument Tungsten W ~3X 0 CdZnTe Х-ray pixel detector Trigger with scintillator detectors С1 &&C2. C1~ 1mip, C2>10 mip Place : LEO satellite or ISS Size : > 1м 2 Duration : ~ 3 years Expected number of events : ~ 300 positrons ~ 3000 electrons above 1 TeV С1 С2 W-converter reduce proton background and help to identify positrons ToF reduce background from albedo particles. Cadmium zinc telluride CdZnTe X-ray detectors are widely used. It allows to reach energy resolution ~better 10 % at about ~10 KeV

Simulation and conclusion Conclusion: Experiments CREST и PSRD and our simulations shows principal possibility to create Synchrotron Radiation Detector to study electron and positron energy spectra above 0.5 TeV. Detector have to include at least low threshold X-ray detector about 1m 2, thin electromagnetic calorimeter/converter and ToF systems. The instrument have to be placed on LEO orbit with relatively small inclination Topology of «good» event. Good coordinate resolution ( better 1 cm) allows to reject background Average energy of photons as function of altitude of emission for differenc electron energies. If detector is placed on ISS the detector threshold ~2 KeV provide measurements of positrons with energy from ~0.5 TeV references 1.J. Musser, C. Bower, S. Coutu et al. Proc. 34 th ICRC, PoS, Hague, H. Anderhuba, et al, Nuclear Physics B, 113 (2002) 166

Phys. Rev. Lett. 113, – Published 18 September 2014