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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
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Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 1
HIGH ENERGY GAMMA-RAY HIGH ENERGY GAMMA-RAY SPECTROMETER SPECTROMETER NATALYA-2NATALYA-2ММFOR SATELLITE MISSION FOR SATELLITE MISSION CORONAS-CORONAS-PHOTONPHOTON
Principal Investigator: Yu.D. KotovDesigners: V.N. Yurov, V.T. Samoilenko, A.I. Arkhangelsky, A.S. Glyanenko, V.V. Kadilin, E.E. Lupar, I.V. RubtzovMoscow Engineering Physics Institute (State University), Russia
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 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 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.
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 3
Registration block structureRegistration block structureSt
ruct
ure
& m
ain
para
met
ers
Block name Geometry, mm Weight, kgSpectrometer SE-1M 680x680x175 ~80
Spectrometer SE-2M 680x680x175 ~80
Anticoincidence dome AK Ø927, h=525 45
Plane anticoincidence detector AC Ø828, h=170 17,5
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 4
Registration modesRegistration modes
Main performances of the spectrometer “Natalia - 2М”
Stru
ctur
e &
mai
n pa
ram
eter
s
Channel Energy range, MeV
Effective area, сm2
Energy resolution, ∆Е/Е
Time of accumulation
Roentgen and gamma - radiationR (Roentgen) 0,3-2 920 10% (662 КeV)
measured1 s
L (Low gamma) 1-10 900 5% (2,5МeV) measured
1 s
M (Medium gamma)
7-200 800 6% (10 МeV) calculated
1 s
H (High gamma) 100-2000 750 32% (500 МeV) calculated
-*
NeutronsN (Neutrons) 20-300 37-120 - -*
*- Energy and time for each event with 1ms accuracy of binding is registered
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 5
Features of the device "Natalia-2M" Features of the device "Natalia-2M" to which the attention in the report is paid: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
Stru
ctur
e &
mai
n pa
ram
eter
s
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 6
Modular structureModular structureM
ultic
ryst
al st
ruct
ure
- 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)
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 7
Spectrometer SESpectrometer SEM
ultic
ryst
al st
ruct
ure
Designations:МА1÷МА4 and МВ1÷МВ4 - modules of layers A and B accordingly;D1А1÷D2А4 and D1В1÷D2В4 – PMT potential dividersPU1А1÷PU2А4 and PU1В1÷PU2В4 – preliminary amplifiersSUM-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)).
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 8
Table of trigger algorithmsTable of trigger algorithms
Channel(energy band)
Measured quantity
(W)
Restriction of W
(MeV)
First layer (A) energy
restriction (MeV)
Second layer (B) energy
restriction (MeV)
Third layer (C) energy
restriction (MeV)
Fourth layer (D) energy
restriction (MeV)
Anticoincidence
RW=EA1;
EA2;EA3;EA4.
0,3<W<2EC>0,3; EC>1*; АК and АС**
L W=EA+EB
0,3<W<10EA+EB+ EC<15
ED>0,3; ED>1*; АК and АС**
M W=EA+EB+EC+ED
W<200 EA or EB>5
EA or EB>5
ED<60 АК**
H W=EA+EB+EC+ED
W>70; coinciden-ce A*B*C or B*C*D
5<EA<200
EB>15 EC>5 ED>5 АК**
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.
Mul
ticry
stal
stru
ctur
e
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 9
Stabilization systemStabilization 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"
Stab
ilizat
ion
Syst
em
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 10
Stabilization schemeStabilization schemeSt
abiliz
atio
n Sy
stem
DAC - Digital-Analog ConverterGIT - The Generator of Current ImpulsesLED - Light-emitting DiodePU - PreamplifierST - Board of Stabilization
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 11
Stabilization ResultsStabilization ResultsSt
abiliz
atio
n Sy
stem
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
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 12
In-flight calibration systemIn-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
Calib
ratio
n Sy
stem
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 13
BSD scheme & placing BSD scheme & placing Ca
libra
tion
Syst
em
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 14
Separation of calibration linesSeparation of calibration linesCa
libra
tion
Syst
em
0 50 100 150 200 250
0,01
0,1
1
0.9
7 M
eV
214 B
i 1.7
6 M
eV
40 K
1.4
6 M
eV
214 B
i 1.1
2 M
eV
228 A
c 0.
91 M
eV
214 B
i 0.6
1 M
eV
208 T
i 0.5
8 M
eV
214 P
b 0.
35 M
eVCou
ntin
g ra
te, p
ulse
/sec
Channel number, N
Background spectrum. Coincidence with BSD signal is switched-off
Configuration of measuring stand. Cobalt irradiates a face side of the module
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 15
Separation of calibration linesSeparation of calibration linesCa
libra
tion
Syst
em
0 50 100 150 200 2500,00
0,02
0,04
0,06
0,08
0,10
0,12
0,14
0,16
1.17 MeV
1.33 МeV
60Co
Cou
ntin
g ra
te, p
ulse
/sec
Channel number, N
Spectrum of detector signals in coincidence with “tagging” BSD signals.
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 16
Some results of works with the Some results of works with the separate SE moduleseparate SE module
PUS-1 DEL-1 DEL-2 PUS-2
S U M
M o d u l e SE
Create SOVI
A D C
Signal 1 Signal 2
Light-tight box
Board ballast resistancesHigh-voltage High-voltage
High-voltage power supplyLow-voltage power supply
( +12V, -12V )
DC source (+27 V)
Low
-vol
tage
(+12
V, -1
2V)
Low
-vol
tage
(+12
V, -1
2V)
Tota
l sig
nal
Scin
tilla
tion
Mod
ule
Resu
lts
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 17
6060Co and Co and 137137CsCs
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,00
2
4
6
8
10
12
60CoE1=1,173MeVFWHM1=0,079MeVE.Res1=6,73%E2=1,332MeVFWHM2=0,082MeVE.Res1=6,17%
137CsE=0,662MeVFWHM=0,058MeVE.Res=8,76%
Module SE spectrum (background substracted)Sources 60Co and 137Cs are established above the center of the module at height 40 cm
Cou
ntin
g ra
te, p
ulse
/sec
Energy, MeV
Scin
tilla
tion
Mod
ule
Resu
lts
Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON 18
2222Na and calibration lineNa and calibration lineSc
intil
latio
n M
odul
e Re
sults
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,80
2
4
6
8
10
12
14
16
22NaE=1,27 MeVFWHM=0,08 MeVE.Res=6,3%
22NaE=0,51 MeVFWHM=0,05 MeVE.Res=9,8%
C
ount
ing
rate
, pul
se/s
ec
Energy, MeV
Module SE spectrum (background substracted)Source 22Na is established above the center of the module at height 40 cm
0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,1 1,2 1,3 1,4
60
80
100
120
140
160
180
N=A+B*E A=0,8+0,5 B=129,1+0,7
Chan
nel n
umbe
r (AD
C)
Energy, MeV