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HEND physical calibrations : status report

HEND physical calibrations : status report. A. Kozyrev, S. Charyshnikov, V. Grinkov,, M. Litvak, I. Mitrofanov, A. Sanin, V. Tret’yakov Institute for Space Research V. Shvetsov, G. Timoshenko, A. Krylov Joint Institute for Nuclear Research. Schematic design of HEND.

sebastian-mckenzie
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HEND physical calibrations : status report

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  1. HEND physicalcalibrations: status report A. Kozyrev, S. Charyshnikov, V. Grinkov,, M. Litvak, I. Mitrofanov, A. Sanin, V. Tret’yakov Institute for Space Research V. Shvetsov, G. Timoshenko, A. Krylov Joint Institute for Nuclear Research

  2. Schematic design of HEND

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

  4. Components of SD and LD sensors

  5. 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 ¼Etotal TRITON ¾Etotal PROTON

  6. Measured spectrum of counts of MD sensor is represented in 16 channels

  7. Schematic design of stilbene and CsI scintillation detectors

  8. Registration of neutrons on recoil protons Neutron Recoil proton

  9. 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 Proton

  10. Distinguishing between neutron and gamma signal in stilbene crystal is done by help of electronic pulse shape in the stilbene crystal Photon

  11. Performance • 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

  12. Stabilityspectra and temperature during mapping 18/02/2002-18/04/2002 2 month 01/04/2003-01/06/2003 2 month 10/09/2002-10/11/2002 2 month

  13. Stability spectra during mapping LD MD CsI(Tl) Stilbene

  14. Stability temperature during mapping Second First Third +15 -15 • t°1- temperature of main electronic board • t°2- temperature of HV board • t°3- temperature of stilbene electronic board -15 < t°HEND < +15

  15. Calibration Facility

  16. Calibration Facility Source of neutrons Flux ~ 106 n cm2 /sec d(T,n) (15 MeV n) d(D,n) 3He (5 MeV n) 7Li(p,n)7Be (< 1 MeV n)

  17. Calibration Facility Cf source: 2.1 MeV (13.2+/-0.2)/r2n cm-2 s-1 Pu-Be source: 3.8 MeV (29.6+/-0.2)/r2n cm-2 s-1

  18. Calibration measurements results

  19. Calibration measurements results

  20. Simulation response function

  21. 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 E-

  22. Using response function Model neutron spectra on Mars orbit Model count of HEND neutron sensor Calculation Response function of HEND sensors Calculation (Pearson criteria) Probability of aligning model Real count of HEND neutron sensor

  23. Conclusion: • 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: • 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

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