AWAKE run 2 Where CNGS target area as

AWAKE run 2 – Where? CNGS target area as extended AWAKE area

CNGS underground area AW AK GS e N C ag r sto E • 1 km long access tunnel from SPS pt 4 • 6% slope: from -60 m (SPS) to -120 m depth. • Target chamber partially used by AWAKE run 1, ~100 m length remain, but is now CNGS storage. • Service gallery in parallel to target chamber (radiation shielded). 2

TCC 4 cavern 2018 Separation shielding & ventilation wall TCC 4 -AWAKE TCC 4 -CNGS TSG 47 • TCC 4 -AWAKE is separated from TCC 4 -CNGS with ventilation/shielding wall • All CNGS elements still in place behind wall (incl. shielding, target, horns) 3

TCC 4 cavern empty 4

Access tunnel Service gallery Proton beam line 1 m free 5 m 4 m collimator support +target Target: 11 m 1 m TBID Horn 1: 7 m Collimator + He-tanks 1: 34 m Horn 2: 7 m He-tanks 2: 41 m 5. 6 m Height ~3. 5 m 100 m 5

TCC 4 cavern since 2006 6

Dismantling CNGS time needed [months] vs length gained [meter] 14. 0 12. 0 10. 0 8. 0 6. 0 4. 0 2. 0 0. 0 First estimate – needs RP input for further study. 0 10 20 30 40 50 60 70 80 90 100 • A first time estimate shows ~14 months are needed to empty and decontaminate the CNGS area, at a cost of ~1. 5 MCHF • Additionally, the area needs to have new general services (light, electricity, network, ventilation…) before any experiment can be installed. Estimate = 4 months, 0. 5 MCHF 7

TCC 4 cross section 3. 5 m • • • 5. 6 m Slope of 6%, downhill Proton beam height ~1. 6 m Width ~5. 6 m Height under crane ~3. 5 m Length downstream of current AWAKE run 1 configuration: ~100 m Note that for access to TCC 4 and service gallery, max. free passage is ~2. 2 mx 2. 2 m (TAG 41). 8

Input needed To estimate cost & time, we must have a first idea of • How much additional length/space is needed • Which services are needed & where (e. g. heat load, cooling needs, power, compressed air, gas, Ethernet, etc. ) We’ll assume “same as for run 1” for • Weight of objects + lifting/transport constraints • Limits on humidity, temperature, dose rate • Access needs (frequency, nr of people) To start CNGS dismantling studies, we must have CERN-RP input (dose rates of objects to define shielded containers and transport means) 9