HEND physical calibrations : status report

2001 Mars Odysseypage 1

W o r k s h o p H E N D - 2003

Institute for Space Research, June 9 - 11, 2003

HENDHEND physical physical calibrationscalibrations:: status status reportreport

A. Kozyrev, S. Charyshnikov, V. Grinkov,, M. Litvak, I. Mitrofanov, A. Sanin, V. Tret’yakov

Institute for Space Research

V. Shvetsov, G. Timoshenko, A. KrylovJoint Institute for Nuclear Research




Schematic design of HENDSchematic design of HEND




Schematic design of sensor LD (Left) and Schematic design of sensor LD (Left) and SD (Right) for epithermal neutronsSD (Right) for epithermal neutrons




Components of Components of SD and LD SD and LD

sensorssensors




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

¼ Etotal

TRITON¾ Etotal

PROTON




Measured spectrum of counts

of MD sensor is represented in 16

channels




Schematic design Schematic design of stilbene and of stilbene and

CsI scintillation CsI scintillation detectorsdetectors




Neutron

Recoil protonRecoil proton

Registration of neutrons on recoil

protons




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




Photon

Distinguishing between neutron and gamma signal in

stilbene crystal is done by help of electronic pulse shape in the

stilbene crystal




Energy range:

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

PerformancePerformance




18/02/2002 24/07/2002 27/12/2002 01/06/2003

Maping(1 year 4 month )

First ThirdSecond

StabilityStability spectra and spectra and temperature during mappingtemperature during mapping

18/02/2002-18/04/20022 month

10/09/2002-10/11/20022 month

01/04/2003-01/06/20032 month




LD MD

Stilbene CsI(Tl)

Stability Stability spectra spectra duringduring mapping mapping




Stability Stability temperature temperature duringduring mapping mapping

-15 < tHEND < +15

First Second Third

• t1- temperature of main electronic board

• t2- temperature of HV board

• t3- temperature of stilbene electronic board

-15

+15




Calibration FacilityCalibration Facility




Source of neutronsFlux ~ 106 n cm2 /sec

d(T,n) (15 MeV n)d(D,n) 3He (5 MeV n)7Li(p,n)7Be (< 1 MeV n)





Pu-Be source: 3.8 MeV(29.6+/-0.2)/r2n cm-2 s-1

Cf source: 2.1 MeV(13.2+/-0.2)/r2n cm-2 s-1





Calibration measurements resultsCalibration measurements results




10-1 100 101

0.0

0.2

0.4

0.6

SIMULATION FU-1 FU-2

Response Function of MD sensor

S, c

m2

E, MeV

Calibration measurements resultsCalibration measurements results




Simulation response functionSimulation response function

10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 101 1020.01

0.1

1

Response function for LD sensor

S, c

m2

E, MeV

SIMULATION FOR HEND AS AN ASSEMBLY SIMULATION SINGLE DETECTOR




Response functions of LD, MD and SC/neutron sensors allow to fit data of #2, #3 and #4 periapses

with function of type E-

HEND energy rangeHEND energy range




Model neutron

spectra on Mars orbit

Response function

of HEND sensors

Calculation

Model count of HEND neutron sensor

Real count of HEND neutron sensor

Calculation (Pearson criteria)

Probability of aligning

model

Using response functionUsing response function




ConclusionConclusion: During mapping, spectra of HEND sensors were stable

During mapping, temperature of HEND instrument were lie in the range of +/- 15 °C

HEND numerical model as an assembly were simulated for neutron LD, MD and SD sensor

Future task:Future task: Building of HEND numerical model with taking into account the spacecraft model

Physical calibration and simulation of SC sensor to establishing of corresponds between Flight and Qualification units

Physical calibration of HEND instrument with respect to gamma-rays and charge particles

HEND physical calibrations : status report

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