Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia.

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia Status of the DESPEC Neutron Detection Working Group D. Cano-Ott on behalf of the WG members

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia Motivation GOAL: to measure neutron emission probabilities and energies for neutron rich isotopes with relevance to basic nuclear physics and nuclear technology: -Low production: 4  detector -High production: TOF spectrometer (in combination with a gamma ray setup)

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia Activities Monte Carlo simulations of the 2 types TOF array (GEANT4) and the 4  detector (MCNPX) for the design of the setups. Hardware acquired for the prototyping phase 3 x BF 3 counters 3 x 3 He counters 1 m 3 of polyethylene 1 x BC501A (NE213) scintillator from St. Gobain with low background housing (5” x 5”) 1 additional module from Scionix under discussion (P. Schotanus) Computer driven CAEN HV Crate 2 HV cards with 10 channels each Test measurements in the next few months -Preparation of a test bench at CIEMAT. Calibration with  -ray sources. -Calibration of the BC501A module with a D/T source in Grenoble. Validation of the simulation tools. -Monitoring of a D/D and D/T source in Minsk (YALINA experiment) -Test of digital electronics (question to DAQ) for n/  discrimination

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 2R d L Neutron source (I) TOF Neutron Spectrometer (NE213)

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia (II) Position Sensitive TOF Neutron Spectrometer (NE213) H d L Neutron source Possible 2 nd layer of detectors for enhancing the efficiency

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia First results on the TOF neutron spectrometer The Monte Carlo simulation tools have been setup up. A realistic geometry of the detectors has been modelled for the GEANT4 code. The efficiencies and energy resolutions of the two setups are in agreement with the initial estimates. As expected, they depend on the energy thresholds. Next steps -Inclusion of the light quenching effect: L(Z,E dep ) -Inclusion of the position sensitivity resolution and flight path reconstruction. -Careful analysis of the effect of the cross talk. -Influence of the implantation setup.

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia Monte Carlo Simulation of the NERO [1] 4  Neutron Detector (BF 3 – 3 He) A. Poch, G. Cortés, F. Calviño, C. Pretel Barcelona, Spain February 13, 2006 [1] Hendryk Schatz schatz@nscl.msu.edu http://www.nscl.msu.edu/tech/devices/nero/tech.html

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia In this work we have studied the neutron detection efficiency for a neutron detector based on a set of BF 3 and 3 He proportional counters, by means of Monte Carlo simulations with MCNPX. The neutron energy ranges from 0.1 eV to 10 MeV. 1. INTRODUCTION

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 2. DESCRIPTION OF THE DETECTOR Ring A 3 He prop. Counters Internal diam.:2.5 cm Length: 80 cm Pressure:4.1 bar Wall thickness:0.05 cm Polyethylene (60cm x 60cm x 80cm) Ring B and C BF 3 prop. Counters (99% 10 B) Internal diam.: 5.08 cm Length: 80 cm Pressure: 0.7 bar Wall thickness:0.05 cm Boron Carbide layer 1 cm thickness Hole (void) 22.4 cm diameter

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 3. DESCRIPTION OF THE SIMULATION Source: Isotropic point source located at the center N=10 6 neutrons Neutron energy:0.1 eV, 1 eV, 10 eV, 100 eV, 1 keV, 10 keV, 100 keV, 1 MeV, 10 MeV Tallies:Current integrated over a surface

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 3. DESCRIPTION OF THE SIMULATION n in (incident neutrons at external wall) n out (Outgoing neutrons at internal wall) Section of a proportional counter (BF 3 or 3 He) Point source n source Absorbed neutrons: n abs =n* in - n out n* in (incident neutrons at internal wall)

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 3. DESCRIPTION OF THE SIMULATION Detector efficiency: Detection efficiency: (Efficiency for the counters in the rings A, B or C) Total Detection efficiency:

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 4. RESULTS Energy (eV) Detector efficiencyDetection efficiency ηAηA ηBηB ηCηC η Total,A η,Total,B η,Total,C η Total (A+B+C) 0.10.2380.3320.3310.2800.1300.0350.444 10.2190.3270.3280.2710.1490.0410.462 100.1970.3160.3210.2530.1680.0490.470 10 2 0.1780.3020.3120.2370.1820.0580.477 10 3 0.1610.2840.2970.2210.1920.0670.481 10 4 0.1450.2650.2810.2060.2020.0770.484 10 5 0.1250.2280.2490.1820.2110.0960.489 10 6 0.0930.1470.1650.1230.1960.1360.455 10 7 0.0480.0710.0840.0350.0820.0840.201

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia 4. RESULTS

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia First results on the 4  detector The first Monte Carlo simulation of the 4  detector has been completed. The efficiency of the detectors is compatible (according to the information available) to the available about NERO. Next steps -Refinement of the “tallies” (MCNPX output) and calculation of the efficiency.+ -Validation of the Monte Carlo results with experimental data. -Effect of the implantation setup. -Investigation of alternative geometries + algorithms for a “possible” energy reconstruction (deconvolution)

Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia.

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Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia.

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Presentation on theme: "Ciemat Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas D. Cano-Ott DESPEC/HISPEC Coll. Meeting, 15th-16th of June 2005-Valencia."— Presentation transcript:

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