SPS Neutrino Facility Preliminary Proton Forecast

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

2. Content • Assumed super cycle configurations • Preliminary proton forecast based on time sharing • Primary Protons Beam Power • Summary SBLNF meeting

3. 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 FT – NF operation is not possible, as ZS needs to be retracted. • Super cycle used for comparison reasons. • NF would receive 3.76 x 1019 protons per run. SBLNF meeting

4. 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 SBLNF meeting

5. 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. SBLNF meeting

6. 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 (on average about 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 ful,l Is 50% - 60% NF realistic with shorter runs ? • Experimental switching to be synchronized with NA off periods. SBLNF meeting

7. ICARUS-NESSIE request vs. delivery potential • Protons request1): • 4.5 x 1019 protons in 1 year for neutrino mode. • 9 x 1019 protons in 2 years for anti-neutrino mode. • 1.35 x 1020 protons in total in 3 years. • Resulting in 4.5 x 1019p.o.t. 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. 1) Taken from the ICARUS-NESSIE contribution to the European Strategy for Particle Physics. SBLNF meeting

8. Beam Power Estimates • Normal running 100 GeV: • 3.5x1013ppp every 6 sec. • Beam energy 100 GeV • Beam power: 95kW (during NF run period) • Ultimate running 120 GeV: • 4.5x1013ppp every 3.6 sec. • Beam energy 120 GeV • Beam power: 240 kW (during NF run period) • Ultimate running 100 GeV: • 4.5x1013ppp every 3.6 sec. • Beam energy 100 GeV • Beam power: 200 kW (during NF run period) SBLNF meeting

9. Summary / Conclusion • Combined running not possible, unless considerable structural changes to SPS lattice are made. • ZS (NA 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. • 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 orPS-EA. • About weekly based time sharing is probably most efficient and equally shares down time. • Nominal NF Beam Power ~ 95 kW (mainly limited by PS extraction). • NF design should be based on the ultimate beam power of 240 kW at 120 GeV, or 200 kW if we decide to stay at (or below) 100 GeV. • Required amount of protons could be delivered in 4.7 runs of 200 days each. • Final extraction scheme, transverse emittances and beam losses remain to be confirmed to consolidate the present preliminary estimate. SBLNF meeting