SPS Neutrino Facility Preliminary Proton Forecast

1. SPSNeutrino Facility Preliminary Proton Forecast Rende Steerenberg with help from K. Cornelis, S. Cettour-Cave, B. Goddard. ICARUS-NESSIE-CERN meeting

2. Combined FT – NF Super Cycle • Like todays super cycles FT – NF (Presently CNGS) • 1 FT cycle of 15.6 sec. • 4 or 5 cycles of 3.6 sec. in 6 sec. slots. • 3.6 sec. NF cycles in 6 sec. slots for PS Complex physics users. • ISOLDE ratio day/night: 38% / 37%. • Combined operation not possible, as ZS needs to be retracted. • Super cycle used for comparison reasons. • NF would receive 3.76 x 1019 protons per run. ICARUS-NESSIE-CERN meeting

3. Time Sharing Super Cycles for FT • Day time: • 2 FT cycles of 10.8 sec. • 2 MD cycles of 7.2 sec. • 2 ZERO cycles of 1.2 sec. • Max. rms current for SPS main circuits • Night time: • 2 FT cycles of 10.8 sec. • 6 ZERO cycles of 1.2 each • Max. rms current for SPS main circuits • ISOLDE ratio day/night: 44% / 33% ICARUS-NESSIE-CERN meeting

4. Time Sharing Super Cycles for NF • Day time: • 5 NF cycles of 3.6 sec. in 6 sec. slots. • 1 MD cycles of 7.2 sec. • Night time: • 6 NF cycles of 3.6 sec. in 6 sec. slots. • ISOLDE ratio day/night: 35% / 33% ICARUS-NESSIE-CERN meeting

5. Proton Forecast With Time Sharing • Run assumptions: • 3.5 x 1013 protons per SPS pulse (Presently limited by PS extraction flux and radiation dose rate) • Transverse emittances compatible with extraction (remains to be confirmed) • Physics run of 200 days shared between FT and NF. • 75% accumulated SPS beam availability. • No FT and NF physics during LHC filling (4 hours per 24 hours). • If NF would run at 60% then FT receives same number of protons as today. • 2.85 x 1019 protons per run (50% would results in 2.37 x 1019 protons per run). • If NF would run at 75% then FT received same number of pulses as today. • 3.56 x 1019 protons per run. • However, • Many different NA users, today’s schedule is full  50% - 60% NF is realistic, but shorter runs. • Experimental switching to be synchronized with NA off periods. ICARUS-NESSIE-CERN meeting

6. Beam Power Estimates • Normal running: • 3.5x1013ppp every 6 sec. • Beam energy 110 GeV • Beam power: 100 kW (during NF run period) • Ultimate running: • 4.5x1013ppp every 3.6 sec. • Beam energy 120 GeV • Beam power: 240 kW (during NF run period) ICARUS-NESSIE-CERN meeting

7. ICARUS-NESSIE request vs. delivery potential • Protons request: • 4.5 x 1019 protons per year for neutrino mode. • 9 x 1019 protons per year for anti-neutrino mode. • 1.35 x 1020 protons in total in 3 years. • 4.5 x 1019 protons per year. • Potential proton delivery: • ~ 2.85 x 1019 protons per years (60% time for NF). • Approximate duration is 4.7 runs of 200 days. ICARUS-NESSIE-CERN meeting

8. Summary / Conclusion • Combined running not possible, unless considerable structural changes to SPS lattice are made. • ZS (NS electrostatic slow extraction septum) to be retracted during NF runs. • 3.6 sec. NF cycle in 6 sec. time slot required for PS complex physics. • Realistic time sharing: • 50% - 60% for NF  2.85 x 1019 p/yr. • Nominal NF Beam Power ~ 100 kW (limited by PS extraction). • Equal or slightly more pulses and protons for NA • Shorter runs per test beam and synchronized experimental switching required. • Make careful choices to allocate experiments to SPS-NA and PS-EA. • About weekly based time sharing is probably most efficient. • ISOLDE on average at 35% (today 37%) (sharing ISOLDE, nTOF and EA contain some flexibility) • Design of neutrino facility should be based on the ultimate beam power of 240 kW at 120 GeV. • Required amount of protons could be delivered in 4.7 runs of 200 days each. • Several things remain to be confirmed to consolidate the present preliminary estimate. • Final extraction • Beam line • Transverse emittances • Beam losses ICARUS-NESSIE-CERN meeting