Fission fragment characterization with FALSTAFF at NFS D. Dor 1) , F. - - PowerPoint PPT Presentation

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Fission fragment characterization with FALSTAFF at NFS D. Dor 1) , F. - - PowerPoint PPT Presentation

Jul 22, 2023 251 likes •416 views

Fission fragment characterization with FALSTAFF at NFS D. Dor 1) , F. Farget 2) , F.-R. Lecolley 3) , X. Ledoux 4,2) , G. Lehaut 3) , Th. Materna 1) , J. Pancin 2) , S. Panebianco 1) , and the FALSTAFF and NFS Collaborations 1) CEA/DSM/Irfu/SPhN,

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SLIDE 1

Fission fragment characterization with FALSTAFF at NFS

  • D. Doré 1), F. Farget 2), F.-R. Lecolley 3), X. Ledoux 4,2), G. Lehaut 3),
  • Th. Materna 1), J. Pancin 2), S. Panebianco1),

and the FALSTAFF and NFS Collaborations 1) CEA/DSM/Irfu/SPhN, Saclay, France 2) GANIL, Caen, France 3) LPC, Caen, France 4) CEA/DAM/DIF, F‐91297, Arpajon, France

Outline

NFS facility Motivations for fission studies FALSTAFF Description Simulations SED performances Conclusion

  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 1

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SLIDE 2
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 2

SPIRAL2 … under construction

NFS technical issues :

  • White and quasi-monokinetic spectra in the 1-40 MeV range
  • Neutron beams with high flux and good energy resolution
  • Complementary to the existing n-tof facilities
  • Measurements by activation reactions (n, p, d)

NFS physics case :

  • Fundamental and applied research
  • Fission and fusion technology
  • Material studies
  • Detector development
  • Biology

NFS Collaboration

Spokesperson : X. Ledoux (~20 institutes, 60 physicists)

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SLIDE 3
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 3

NFS Facility

Characteristics of NFS :

  • Imax = 50 µA
  • Frequency < 1MHz, burst duration < ns

beam

Irradiation box Converter chamber Magnet collimator

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SLIDE 4
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 4

Be converter for neutron production

CEA/DSM/Irfu

Neutron converter Extraction and handling systems

CEA/DSM/Irfu

Magnet

IPHC IPNO

proton beam dump

beam

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SLIDE 5

Collimator

GANIL

Neutron beam dump

CEA/DAM/DIF

  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 5

NFS optimization

Neutrons

before after

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SLIDE 6
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 6

July‐Aug.2011

  • Dec. 2011

Setp.‐Oct 2011

LINAG

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SLIDE 7
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 7

  • Aug. 2012

NFS

  • Sept. 2012
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SLIDE 8
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 8

NFS Installation

PLANNING NFS installation : end-2013 1st Beam : mid-2014 8 partners :

‐ GANIL, Caen, France ‐ CEA/DAM/DIF, Arpajon, France ‐ CEA/DSM/Irfu, Saclay, France ‐ IN2P3, France ‐ CEA/DEN, Cadarache, France ‐ NPI, Řež, Czech Republic ‐ Uppsala University, Uppsala, Sweden ‐ KIT, Karlsruhe, Germany

MoU for NFS construction, signed the 26th of January 2012 Capital investment : 523 k€ Human resources : 350 person-month Total investment : 3185 k€

LOI : Neutron induced reaction studies (4) Fission studies (3) Cross section meas. by activation (2) Biology (1) Detector development (1)

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SLIDE 9
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 9

Motivations for fission studies

FALSTAFF Four Arm cLover for the STudy of Actinide Fission Fragments

Provide nuclear data needed for applications (GEN IV, SPIRAL2) Improvement of models (microscopic / phenomenological) Study of the fission mechanism Libraries TKE Energy sharing TKE vs En intrinsic/collective exc A and Z yields. shell effects Neutron mult Exc. Ene. sharing, deform. A and Z dist. poisons, DN precursors, decay heat Energy dependence model adjustment,

Actinides to study: 238,235U, 239Pu, 237Np, 232Th, 233U, …

Fragments in coincidence

  • Charges
  • Kinetic energies
  • Final masses (after n evaporation)
  • Initial masses (before n evaporation)

Fragments + gamma Fragments + neutrons D-One

Neutron mult.

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SLIDE 10
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 10

FALSTAFF

Neutron beam Target MCP Emissive foil SED IC

2V method TOF measurement

good time resolution <150 ps good position resolution ~1.5 mm

EV method Energy measurement

good energy resolution ~1% ΔE & E meas. (charge id) start : MCP stop : SED Segmented Ionization Chamber

2V method mass before evaporation EV method mass after evaporation

2 SEDs

Possible final setup

  • r

3rd step

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SLIDE 11
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 11

FALSTAFF : phases and tests

Simulations, End of SED tests and Test at Saclay with ‐ Cf source ‐ TOF : minised + Sed (50 cm) ‐ E : ionization chamber

Charge, Energy and Final Mass of Light Fragments (comparisons with simulations)

Energy loss measurements forseen Test at Saclay with Cf source (2 fgs) and Experiment at NFS (1 arm++) ‐ TOF MCP + Sed (50 cm) ‐ E : 2 ionization chambers

Charge and Final Mass

  • f Light and Heavy Fragments

Energy of both fragments

Cf/ cible SED IC IC MCP

(Efficiency= 0.67%)

frag. frag. e‐

Phase 2

  • Nov. 2012

Preparation phase : light fragment masses

Emissive foils. Cf MiniSED SED IC frag. e‐ e‐ magnet

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SLIDE 12
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 12

GEANT4 Simulations (1)

Event generation : Geometry (efficiency), Materials (stragglings, energy losses) Analysis : Z known, corrections for energy losses mass reconstruction from simulated V & E

SedTOFSed IC energy

magnet

IC energy SedTOFSed

magnet

Target

  • E. Wilhelm

Yield (a.u.)

Initial Final

140.00 (0.15) 140.00 (0.66) 98.00 (0.15) 98.06 (0.34) 140.00 (0.51) 140.00 (1.22) 98.00 (0.51) 98.06 (0.88) 140.00 (0.58) 140.00 (1.58) 98.00 (0.58) 98.06 (1.15) 140.00 (0.68) 140.00 (1.85) 97.98 (0.68) 98.05 (1.58)

Mass (uma) Mass (uma)

No experimental resolution σ(E) 1% σ(pos) 2 and 1.5 mm σ(t) 150 ps Cs‐140, 74 MeV Rb‐ 98, 105 MeV Without evaporation

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SLIDE 13
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 13

GEANT4 Simulations (2)

In GEANT4 :

  • To be verified : energy loss « tables »
  • To be improved : angular straggling
  • To be implemented : inhomogeneity, charge resolution,
  • E. Wilhelm

Yield (a.u.) Mass (uma) Mass (uma)

With evaporation Initial Final

Initial fragment mass (uma) <Neutron multiplicity

Very encouraging result ! Theoretical Simulated Reconstructed

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SLIDE 14

Time signal from anodes at mid‐distance (1.6 mm) between the detector window and the cathode. Position reconstructed from a (68x48) pixelized cathode. Time resolution σ< 150 ps Position resolution < 3 mm without a magnetic field < 1 mm with a magnetic field

Time resolution tests with a 252Cf source

Secondary Electron Detector (SED) Performances

  • Th. Materna

New SED prototype with an active surface of 200 x 140 mm2

  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 14

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SLIDE 15
  • D. Doré, SPhN/Irfu/DSM/CEA

WONDER Workshop, Sept. 2012 15

SUMMARY/CONCLUSIONS

NFS facility : Building in construction, All components are designed, some of them are under construction Radioprotection and safety issues are solved 1st beam in 2014 FALSTAFF : Project divided in 3 phases to overcome stopping points Simulations are encouraging about the feasibility Detector performances seem OK but have to be checked further Test with one arm in preparation milestone for the construction Well positioned for D-One experiment (positive SAC recommandation)