1. Xenon gamma-ray detector for “SIGNAL” experiment
National Research Nuclear University “MEPhI”, Russia, Moscow
Xenon gamma-ray detector for “SIGNAL” experiment
Grachev V.M., Shustov A.E., Chernysheva I.V., Dmitrenko V.V., Novikov A.S., Petrenko D.V., Vlasik K.F., Ulin S.E., Uteshev Z.M.
The 3rd International Conference on Science, Application, and
Technology of Xenon Radiation Detectors (XeSAT)
April 3rd - 7th, 2017

2. INTERHELIOPLOBE mission; Experiment “SIGNAL”; Goals and tasks;
OUTLINE
INTERHELIOPLOBE mission;
Experiment “SIGNAL”;
Goals and tasks;
Construction and equipment;
Xenon gamma–detector development and production;
Conclusion.
Grachev V.M. XeSAT, April 3th, /12

3. SOLAR MISSIONS Grachev V.M. XeSAT, April 3th, 2014 3/12 Status
NASA, ESA, JAXA
USSR and Russia
Completed
SMM ( )
Wide Band Spectrometer ( )
OSSE, BATSE, COMPTEL (CGRO
ULYSSES ( )
GOES-1 – GOES-10 ( )
ISEE 3 (1978)
PROGNOZ 1-10 ( ):
KORONAS-I ( )
KORONAS-F ( )
KORONAS-FOTON(2009)
Operating
SOHO (1995), RHESSI (2002), STEREO(2006), Hinode (2006), SDO(2010), Fermi/GBM (2008), Suzaku(2010)
In developing
SOLAR PROBE+(2018),
SOLAR ORBITER (2018),
Solar –C/A (2018), ROADMAH ( )
INTERHELIOPROBE (2025+)
Grachev V.M. XeSAT, April 3th, /12

4. Fig.1. Model of Interhelioprobe
The INTERHELIOPROBE mission aims to study the inner heliosphere and the Sun at close distance and from out-of-ecliptic orbit.
Mission Information
Number of spacecrafts 2;
Launch date (2025+);
Number of scientific instruments 19;
Total mass of scientific payload 160kg;
Active operation time 5 years;
Closest distance to the Sun Rs;
Fig.1. Model of Interhelioprobe
Grachev V.M. XeSAT, April 3th, /12

5. INTERHELIOPROBE GOALS`
INTERHELIOPROBE GOALS
Magnetic field in the solar polar area;
Fine structure and dynamics of the solar atmosphere;
Mechanisms of solar corona heating and acceleration of solar wind;
Origin and global dynamics of solar flares and coronal mass ejections;
Generation and transport of energetic particles on the Sun and in the heliosphere.
Grachev V.M. XeSAT, April 3th, /12

6. Position of “Signal” equipment onboard spacecraft “Interhelioprobe”
“SIGNAL” EXPERIMENT
“SIGNAL”
EQUIPMENT
“SIGNAL”
EQUIPMENT
Fig.2b
Fig.2a
Position of “Signal” equipment onboard spacecraft “Interhelioprobe”
“SIGNAL” experiment is being developed for the study of solar gamma-rays using a xenon gamma-ray spectrometer.
Grachev V.M. XeSAT, April 3th, /12

7. GOALS AND TASKS The main scientific tasks of “SIGNAL” experiment are:
Research of X-ray and gamma line and continuum emission in energy range 30 keV – 5 MeV;
Study of gamma-ray bursts of Galactic and Metagalactic origin;
Analysis of gamma-ray lines near the Earth and Venus;
Charged particle fluxes registration along the spacecraft trajectory.
Grachev V.M. XeSAT, April 3th, /12

8. “SIGNAL” EQUIPMENT “SIGNAL” experiment consists of:
Xenon Gamma Detector;
Three scintillation counters for anticoincidence shield;
Electronics modules;
High Voltage Power Supply;
Silicone Photomultipliers;
Base of the construction;
Aluminum case.
Figure 3. CAD 3D model of the SIGNAL equipment and the location of its main units. 1 – xenon gamma-ray detector, 2 – scintillator anticoincidence detector, 3 – power supply and voltage conversion and stabilization unit, 4 – digital electronics unit, 5 – platform, 6 – protective case, 7 – connectors.
Grachev V.M. XeSAT, April 3th, /12

9. “SIGNAL” EQUIPMENT Technical information:
Parameter
Value
Mass, kg
6.5
Dimensions, mm
462x250x220
Power consumption, W 15
Power supply voltage, V 24
Operating temperature range, C°
5 - 85
Gamma-ray energy range, keV
Energy resolution at 662 keV, %
1.7±0.1
Service life, years 10
Grachev V.M. XeSAT, April 3th, /12

10. Detector development, construction and tests
Today we are manufacturing parts of the xenon gamma-ray detector, assembling the ionization chamber and testing it for optimal high voltage supply.
Next steps are coating of ionization chamber with kevlar for additional strength, filling with purified xenon+H2 gas mixture, developing high voltage supply unit and charge sensitive preamplifier.
Fig.5. Ionization chamber without kevlar coating for Xenon gamma-detector
Fig.4. Frisch grid and ceramics of ionization chamber
Grachev V.M. XeSAT, April 3th, /12

11. Anticoincidence detector
Another important part of “Signal” equipment is the anticoincidence detector (ACD) based on plastic scintillators. For light collection silicone photomultipliers (SiPM Sensl Micro-C) are used.
Fig.6. 3d model of ACD.
1–xenon gamma detector; 2–barrel scintillator plates; 3 – endcape scintillators ; 4 – parts of construction frame
Fig.6.Scintillator BC-408 for ACD
Fig.7. Example of signal from SiPM
Grachev V.M. XeSAT, April 3th, /12

12. CONCLUSION
The “SIGNAL” experiment aims at gamma­-ray study of the Sun onboard spacecraft INTERHELIOPROBE.
The main part of “SIGNAL” equipment is the Xenon Gamma Detector. It is surrounded by an anticoincidence shield for charged particle rejection. For signal processing and data acquisition a Digital Electronics Module is used.
The tasks of the experiment are research of X-ray and gamma line and continuum emission in the energy range 30 keV – 5 MeV. Study of gamma-ray bursts of Galactic and Metagalactic origin. Analysis of gamma-ray lines near the Earth and Venus. Charged particle fluxes registration along the spacecraft trajectory.
Grachev V.M. XeSAT, April 3th, /12

13. Thank you
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