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HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2 М 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. HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2 М FOR SATELLITE MISSION CORONAS-PHOTON.

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HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2 М FOR SATELLITE MISSION CORONAS-PHOTON

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  1. 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 HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2МFOR SATELLITE MISSION CORONAS-PHOTON Moscow Engineering Physics Institute (State University), Russia

  2. 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 from0,3 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. Registration block structure Structure & main parameters

  4. Registration modes Main performances of the spectrometer “Natalia - 2М” Structure & main parameters *- Energy and time for each event with 1ms accuracy of binding is registered

  5. 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. Modular 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) Multicrystal structure

  7. Spectrometer SE 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)). Multicrystal structure

  8. Tableoftriggeralgorithms Multicrystal structure

  9. 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. 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. Stabilization Results Measurements of stabilization system effectiveness tuning were spent with use of the technological sample of a spectrometer and reference gamma sources set. Stabilization System Stabilization OFF Stabilization ON

  12. 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. BSD scheme & placing Calibration System

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

  15. Separation of calibration lines Spectrum of detector signals in coincidence with “tagging” BSD signals. Calibration System

  16. Some results of works with the separate SE module Scintillation Module Results

  17. 60Co and 137Cs Scintillation Module Results

  18. 22Na and calibration line Scintillation Module Results

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