Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON1 HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2М FOR SATELLITE MISSION CORONAS- PHOTON Principal Investigator:

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


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.


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


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


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


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 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)).


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


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


Stabilization schemeStabilization schemeSt

abiliz

atio

n Sy

stem

DAC - Digital-Analog ConverterGIT - The Generator of Current ImpulsesLED - Light-emitting DiodePU - PreamplifierST - Board of Stabilization


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


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


BSD scheme & placing BSD scheme & placing Ca

libra

tion

Syst

em


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


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.


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


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


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

Documents

Spectrometer NATALYA-2M. Satellite CORONAS-PHOTON1 HIGH ENERGY GAMMA-RAY SPECTROMETER NATALYA-2М FOR SATELLITE MISSION CORONAS- PHOTON Principal Investigator: