Physics performances of baseline target design (Solution #5)

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Presentation transcript:

Physics performances of baseline target design (Solution #5) n_TOF Target#3 Review CERN May 29 2019 vasilis.vlachoudis@cern.ch lucia.anna.damone@cern.ch francisco.ogallar.ruiz@cern.ch and the nTOF Target#3 WG

p+ EAR1 EAR2 EAR1 p+ Baseline Solution #5 top cross section side cross section front cross section

p+ EAR1 EAR2 EAR1 p+ Baseline Solution #5 Target: Pb 5×5cm + 1×15cm top cross section p+ EAR1 EAR2 EAR1 p+ Target: Pb 5×5cm + 1×15cm Al support structures Enclosed in SS container EAR1: 4cm B-H2O moderator EAR2: 5cm Pb + 3.5cm H2O moderator side cross section front cross section

Neutron Fluence: EAR1 ↑+20% ↓-15% Sol #5 current: current base line design Sol #5 previous: as presented in past nTOF collaboration meeting (for ref) Solution #4: previous proposed solution Solution #0: currently installed target

Neutron Fluence: EAR1 ↓-15% ↑+20%

Neutron Fluence: EAR2 ≈same ↑<×2

Prompt Photon Fluence: EAR1 ≈same

Prompt Photon Fluence: EAR2 ≈same

Delayed Photon Fluence: EAR1 ↓/4-5 2.2MeV 7-8 MeV

Delayed Photon Fluence: EAR2 ≈same (with H2O moderator) 2.2MeV ↓/2-3 7-8 MeV Everywhere else ↓×2

Resolution Function: EAR1 1 to 10 eV 1 to 10 keV 1 to 10 MeV

Resolution Function: EAR2 1 to 10 eV 1 to 10 keV 1 to 10 MeV

Conclusions The proposed target #3 design fulfills all the requirements of nTOF collaboration Requirements Target performance EAR1 neutron fluence no reduction more than 10-15% evaporation +20% thermal -15% due to absence of H2O cooling layer prompt photons better or similar same delayed photons improve gamma background 2.2 & 7-8 MeV depleted /4-5 resolution - similar (within limited statistics) background similar EAR2 not higher than ×2 (×3 tolerated) evaporation ×2, rest the same no Al dips reduced /2 (except 2.2MeV) improve double peek disappeared should increase due to Fn increase