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Heinz Vincke, DGS/RP, SBLNF meeting 5.12.2012

Residual dose rate at the muon pits & dose rate downstream of the hadron stopper during operation of SBLNF. Heinz Vincke, DGS/RP, SBLNF meeting 5.12.2012. some parameters. Beam momentum 100 GeV/c Beam intensity 4.5×10 13 p/3.6s  200 kW

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Heinz Vincke, DGS/RP, SBLNF meeting 5.12.2012

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  1. Residual dose rate at the muon pits &dose rate downstream of the hadron stopper during operation of SBLNF Heinz Vincke, DGS/RP, SBLNF meeting 5.12.2012

  2. some parameters • Beam momentum 100 GeV/c • Beam intensity 4.5×1013 p/3.6s  200 kW • Irradiation profile: 180 days of continues beam • Density of Moraine 1.9 gcm-3

  3. Ambient dose equivalent rate at muon pits (1 week cooling) - preliminary results More CPU time/MC–techniques needed to improve statistics  preliminary results Presented in the last meeting • After 1 week of decay: • 1st muon pit: • A few hundred uSv/h inside • ~30 uSv/h at ‘border’ to iron • 2nd muon pit: • OK Hadron stop 2ndmuonpit 1stmuonpit Hadron stop Decay tunnel

  4. Ambient dose equivalent rate in the muon pits(final results) H*10 (after 1week of decay) • … same conclusion as before: • (after 1 week of decay) • 1st muon pit: • A few hundred uSv/h inside • ~30 uSv/h at ‘border’ to iron • 2nd muon pit: • OK Concrete shielding Fe of HS 2ndmuonpit 1stmuonpit Fe of HS End of decay tunnel C-core of HS

  5. Dose rate during beam Position of EHN1? 100 GeVmuon ranged out at 320 m (see M. Calviani’s talk from 19.10.2012) …. at a distance of ~280 m (from target) dose rate < 1 uSv/h EHN1 has ‘permanent workplaces’ with an ambient dose rate limit of 3 uSv/h.

  6. Dose rate during beam (100 GeV/c, 4.5E13 ppp/3.6s->200kW) z- distance from target 3 uSv/h 1 uSv/h • … proposal to use (at least) the 1 uSv/h limit: • to have a safety factor • to allow a possible increase to 300 kW • without RP consequences for EHN1 (radiological re-classification, restricted access in EHN1, etc).

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