1. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON1 HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2М FOR SATELLITE MISSION CORONAS- PHOTON Principal Investigator: Yu.D. Kotov Designers: V.N. Yurov, V.T. Samoilenko, A.I. Arkhangelsky, A.S. Glyanenko, V.V. Kadilin, E.E. Lupar, I.V. Rubtzov Moscow Engineering Physics Institute (State University), Russia

2. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON2 The high-energy radiation spectrometer "Natalya - 2М" is a part of a complex of scientific instrumentation of a satellite "CORONAS-PHOTON" and is developed within the bounds of the Federal space program of Russia on fundamental space investigations. "Natalya - 2М" is designed for realization of following measurements:  studying of time behavior of intensity and energy distributions of solar and space hard electromagnetic radiation in a wide energy range from 0,3 to 2000 МeV;  registration of solar neutrons in the energy range of 20 – 300 MeV. "Natalya - 2М" includes registration block, data handling and output systems and high voltage supply block.

3. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON3 Registration block structure Structure & main parameters Block nameGeometry, mmWeight, kg Spectrometer SE-1M680x680x175~80 Spectrometer SE-2M680x680x175~80 Anticoincidence dome AKØ927, h=52545 Plane anticoincidence detector ACØ828, h=17017,5

4. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON4 Registration modes Main performances of the spectrometer “Natalia - 2М” Structure & main parameters ChannelEnergy range, MeV Effective area, сm 2 Energy resolution, ∆Е/Е Time of accumulation Roentgen and gamma - radiation R (Roentgen)0,3-292010% (662 КeV) measured 1 s L (Low gamma)1-109005% (2,5МeV) measured 1 s M (Medium gamma) 7-2008006% (10 МeV) calculated 1 s H (High gamma)100-200075032% (500 МeV) calculated -* Neutrons N (Neutrons)20-30037-120--* *- Energy and time for each event with 1ms accuracy of binding is registered

5. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON5 Features of the device "Natalia-2M" to which the attention in the report is paid: 1. Modular structure of the device 2. Stabilization system of detecting block parameters 3. System of energy scale calibration of the device during experiment Also results of working off of the module of the spectrometer which characteristics in many respects are defining for the device as a whole will be presented Structure & main parameters

6. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON6 Modular structure Multicrystal structure - Possibility of registration of gamma radiation in a wide dynamic range from 0,3 to 2000 МэВ - Improvement of a parity of useful and background events, possibility to use the individual analysis of the information from each section and their various combinations at allocation of solar flares - Reduction of probability large energy-releases in the detector - Improvement of frequency characteristics of the device (processing of signals of each channel by separate ADC)

7. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON7 Spectrometer SE Multicrystal structure Designations: МА1÷МА4 and МВ1÷МВ4 - modules of layers A and B accordingly; D1А1÷D2А4 and D1В1÷D2В4 – PMT potential dividers PU1А1÷PU2А4 and PU1В1÷PU2В4 – preliminary amplifiers SUM-A and SUM-B - boards of adders of layers A and B accordingly; ST-A and ST-B - boards of stabilisation; GIT - board of current impulses generators; LED1А, LED2А, LED1В and LED2В - light-emitting diodes of stabilisation system; DBSD - discriminator (provides formation of signals from BSD); DSh – control signal decoder (for operating modes of electronic units SE- 1М (SPI)).

8. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON8 Table of trigger algorithms Channel (energy band) Measured quantity (W) Restriction of W (MeV) First layer (A) energy restrictio n (MeV) Second layer (B) energy restriction (MeV) Third layer (C) energy restriction (MeV) Fourth layer (D) energy restriction (MeV) Anticoinci dence R W=EA1; EA2; EA3; EA4. 0,3<W<2 EC>0,3; EC>1*; АК and АС** LW=EA+ EB 0,3<W<10 EA+EB+ EC<15 ED>0,3; ED>1*; АК and АС** MW=EA+ EB+EC+ ED W<200EA or EB>5 ED<60АК** HW=EA+ EB+EC+ ED W>70; coinciden- ce A*B*C or B*C*D 5<EA< 200 EB>15EC>5ED>5АК** Notes * - Energy threshold can be changed through SPI channels (1024 values); ** - Energy threshold can be changed by single commands (2 values for АК and 2 for the AC) or through SPI channels (1024 values), cutout of an interdiction separately for АК and AC is possible. Multicrystal structure

9. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON9 Stabilization system System of gain stabilization The stabilization system allows to compensate influence on PMT multiplication factor of following factors: Influence of detector loading change Influence of external magnetic fields Effects of PMT "ageing" Stabilization System

10. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON10 Stabilization scheme Stabilization System DAC - Digital-Analog Converter GIT - The Generator of Current Impulses LED - Light-emitting Diode PU - Preamplifier ST - Board of Stabilization

11. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON11 Stabilization Results Stabilization System Measurements of stabilization system effectiveness tuning were spent with use of the technological sample of a spectrometer and reference gamma sources set. Stabilization OFF Stabilization ON

12. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON12 In-flight calibration system - possibility of calibration of a spectrometer power scale during flight experiment - possibility of compensation of long-term degradation of stabilization system light-emitting diodes properties (luminosity reduction) and scintillation crystals Calibration System

13. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON13 BSD scheme & placing Calibration System

14. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON14 Separation of calibration lines Calibration System Background spectrum. Coincidence with BSD signal is switched-off Configuration of measuring stand. Cobalt irradiates a face side of the module

15. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON15 Separation of calibration lines Calibration System Spectrum of detector signals in coincidence with “tagging” BSD signals.

16. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON16 Some results of works with the separate SE module Scintillation Module Results

17. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON17 60 Co and 137 Cs Scintillation Module Results

18. Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON18 22 Na and calibration line Scintillation Module Results