M. Calviani, A. Ferrari (EN/STI), P. Sala (INFN) Progress report: Secondary Beam Production SBLNF meeting – 19th October 2012 M. Calviani, A. Ferrari (EN/STI), P. Sala (INFN)

M. Calviani, A. Ferrari, P. Sala Outline Update on the m fluence Margins for the location of the ND FLUKA implementation of the target “chase” design First look at dose rate, absorbed dose and HEH fluence First look at energy deposition Ideas on potential neutrino target concepts M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Update on the m fluence Margins for the location of the ND FLUKA implementation of the target “chase” design First look at dose rate, absorbed dose and HEH fluence First look at energy deposition Ideas on potential neutrino target concepts M. Calviani, A. Ferrari, P. Sala 19th October 2012

Update on muon fluence Muons produced by pion/kaon decay: Penetrate the ground after hadron stopper and could reach the ND  significant background for experiment Critical parameters Primary beam energy Moraine density Distance between target and ND Design of hadron stopper Discussed during 26th September meeting (link) Target chamber Decay pipe Hadron stopper Near detector target ~26 m (driven by production elements configuration) ~74 m (to be driven by experimental requirements) ~10 m ~350 m (driven by m in ND – experimental requirements) + civil engineering constraints M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Update on muon fluence Proton momentum Muon range 100 GeV/c ~320 meters 110 GeV/c ~340 meters 120 GeV/c ~360 meters Assumptions: 4.5*1013 p/pulse 1.9 g/cm3 moraine density DP 100 m long HS: 3 m core + 7 m Fe Decay pipe Hadron stopper Moraine soil No large safety margin for the location of the ND ~15% on moraine density (40 m moraine  20% density change) No margin on energy! Increase of Fe core length (10 m moraine  3.5 m Fe) M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Update on muon fluence 100 GeV/c case Coherent production (very low cross-section) could result in ~100 GeV muons being produced Additional 25-30 meters would be required! Monoenergetic 100 GeV/c muons 345 m Muons produced from 100 GeV/c protons 320 m Normalization at ~50 m from target M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Update on the m fluence Margins for the location of the ND FLUKA implementation of the target “chase” design First look at dose rate, absorbed dose and HEH fluence First look at energy deposition Ideas on potential neutrino target concepts M. Calviani, A. Ferrari, P. Sala 19th October 2012

Discussed during 26th September meeting (link) M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station building and vault Secondary beam line FLUKA preliminary implementation: Shielding thickness not optimized! Hadron stopper Target station building and vault Target chase Primary beam area Target shielding Decay pipe Decay pipe shielding Ground (moraine) M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station design: FLUKA implementation Target station building and vault (covered by soil) Top concrete shielding Primary beam area 750 cm Fe shielding Target/focusing Baffle Ground (moraine) M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station design: FLUKA implementation Target station building and vault 200 cm He vessel (medium blue) Concrete shielding (red) 300 cm Iron shielding (dark blue) Target chase 300 cm Target & horn/reflector Ground (moraine) M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station: Ambient dose equiv. H*(10) Assumption: ultimate beam (R. Steerenberg, 26th Sept.) 120 GeV/c 3.6 s rep. rate 4.5*1013 p/pulse 240 kW NB: 120 GeV/c out of question in the current layout! Results: ≤10 mSv/h on top of the vault ~1 Sv/h on top of the first layer of shielding Note: Weak point in the present shielding design To be corrected at the next iteration! M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station preliminary design: H*(10) Overall H*(10) view of the installation: H*(10) at 15 m from beam axis (DP level) <1 mSv/h Ground level ~20 m from beam axis Dose rate after the dump mainly due to m (reduced activation!) M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station preliminary design: H*(10) Primary area: Average around 5 mSv/h Peak ~200 mSv/h through the baffle (5 cm radius) ~1 Sv/h on top of the first layer of shielding Aperture (10 cm) between shielding blocks to evaluate effect of neutron penetration M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station design: HEH and absorbed dose High energy hadron fluence: Important to have a look at this since the beginning (R2E) Levels on the surface of the vault ≤107 HEH/cm2/year Absorbed dose: 0.5-10 kGy/y on the gap above the first layer of shielding ~10 MGy/y inside the chase ~50 Gy/y on the concrete lining M. Calviani, A. Ferrari, P. Sala 19th October 2012

Target station design: energy deposition Region kJ/pulse kW (average) Target 5.62 1.56 Top Fe shielding (layer 1) 48.32 13.42 Lateral Fe shielding 57.50 15.97 Bottom Fe shielding 55.42 15.39 Decay pipe shielding (total) 258.56 71.82 Decay pipe shielding (1st layer) 243.66 67.68 Hadron stopper (graphite) 159.54 44.32 Hadron stopper (iron) 123.70 34.36 Horn (total) 7.01 1.95 Reflector (total) 5.05 1.40 Target: ~1.5 kW “Chase” iron shielding: ~50 kW deposited power Air/He cooling probably necessary! DP concrete shielding: ~68 kW on the first 50 cm  thermal cracking? Mitigation strategy to be further investigated M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Update on the m fluence Margins for the location of the ND FLUKA implementation of the target “chase” design First look at dose rate, absorbed dose and HEH fluence First look at energy deposition Ideas on potential neutrino target concepts M. Calviani, A. Ferrari, P. Sala 19th October 2012

Potential neutrino target configuration CNGS target design Cooling by radiative emission and partially by convective exchange Important: graphite at high temperature (~1000 ºC) CNGS-like evolutionary design Simpler construction and more diagnostics Complete remote manipulation Possibility to have an open He loop cooling – enhanced convection No segmentation (only if mechanically needed) Larger rod (&beam) radius  reduced off-axis issues and enhance LE p/K M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala CNGS spare design CNGS spare target ready for installation ©D. Grenier (EN/STI) M. Calviani, A. Ferrari, P. Sala 19th October 2012

CNGS spare modified design ©D. Grenier (EN/STI) New CNGS spare target – completely remotely handled This solution potentially exclude the possibility to insert the target inside the horn! M. Calviani, A. Ferrari, P. Sala 19th October 2012

M. Calviani, A. Ferrari, P. Sala Conclusions Margins for the muon range are not so reassuring First preliminary shielding configuration of the target chase seems to indicate that the solution is viable Collaboration with DGS/RP Work with Polish student (EN/STI + DGS/RP) on-going Already some preliminary ideas on neutrino target configuration M. Calviani, A. Ferrari, P. Sala 19th October 2012