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NASA 2001 Mars Odyssey page 13 Workshop HEND

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Workshop HEND - 2002
Present knowledge of HEND
efficiency for neutrons and gammarays
Workshop
“The First year of HEND operations on the NASA Odyssey Mars Orbiter”
Moscow, Russia
May 20-22, 2002
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 1
Workshop HEND - 2002
Schematic design of HEND
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 2
Workshop HEND - 2002
Schematic design of sensor LD (Left) and SD (Right) for
epithermal neutrons
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 3
Workshop HEND - 2002
Components of SD
and LD sensors
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 4
Workshop HEND - 2002
He3+n→H3+p+ Etotal
Etotal = 0.764 MeV
E(H3) = 1/4 Etotal = 0.191 MeV
E(p) = 3/4 Etotal = 0.573 MeV
1/4Q
TRITON
3/4Q
PROTON
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 5
Workshop HEND - 2002
Measured spectrum of
counts of MD sensor is
represented in 16
channels
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 6
Workshop HEND - 2002
Schematic design of
stilbene and CsI
scintillation detectors
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 7
Workshop HEND - 2002
Registration of
neutrons on recoil
protons
Neutron
Recoil proton
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 8
Workshop HEND - 2002
Proton
Separation between
background and recoil
protons is done by help
of anticoincidence
circuit based on CsI
crystal which
surrounds stilbene
detector in direction of
open space
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 9
Workshop HEND - 2002
Distinguishing between
neutron and gamma
signal in stilbene crystal
is done by help of
electronic pulse shape in
the stilbene crystal
Photon
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 10
Workshop HEND - 2002
PERFORMANCE:
LD:
10.0 eV - 1.0 MeV
MD:
0.4 eV -100.0 keV
SD:
0.4 eV - 1.0 keV
IN/SC/N:
850 keV – 15.0 MeV
IN/SC/G:
60 keV– 2.0 MeV
OUT/SC:
30 keV – 1.0 MeV
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 11
Workshop HEND - 2002
HEND energy range
Response functions of LD, MD
and SC/neutron sensors allow to
fit data of #2, #3 and #4 periapses
with function of type пЃЎE-пЃ§
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 12
Workshop HEND - 2002
Calibration facilities of Joint Institute
of Nuclear Research in Dubna (Russia) were used
for physical calibrations of 1st and 2nd Flight
Units of HEND
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 13
Workshop HEND - 2002
PHYSICAL
CALIBRATIONS:
The measured
sensitivity has met
agreement with the
numerical simulation
results
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 14
Workshop HEND - 2002
PHYSICAL
CALIBRATIONS:
The difference
between numerical
calculation and
measured value for SD
sensor takes place
due to not taking
account of HEND
model as an assembly
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 15
Workshop HEND - 2002
PHYSICAL
CALIBRATIONS:
The difference
between effective
cross section of SC
detectors of 1st and
2nd Flight Units is
resulted from different
electrical thresholds
and it could be easily
taken into account
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 16
Workshop HEND - 2002
Future tasks:
пЃ± Mathematical simulation:
• building of HEND numerical model as an
assembly
• building of HEND numerical model with
taking into account the spacecraft model
пЃ± Physical calibration of HEND instrument with
respect to gamma-rays and charge particles
пЃ± Establishing of correspondence between Flight
end Qualification Units
NASA 2001 Mars Odyssey
Russian Aviation and Space Agency
Institute for Space Research
page 17
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