Positional Relationship Between CEPC and SPPC for Accelerator Physics

"The positional relationship between the Circular Electron-Positron Collider (CEPC) and the Super Proton-Proton Collider (SPPC) involves careful considerations such as bypass tunnels, compatibility for future e-P collision programs, and shielding in the tunnel. Various scenarios are discussed regarding the placement of auxiliary tunnels in relation to the CEPC and SPPC, taking into account construction schedules and accelerator physics."

• CEPC
• SPPC
• accelerator physics
• bypass tunnels
• e-P collision

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1. Positional relationship between CEPC and SPPC/ auxiliary tunnel Dou Wang Thanks to the discussions with SPPC group and CEPC hardware groups. CEPC day, A623, IHEP, June 28th2019.

2. CEPC inner side of tunnel Large separation between CEPC & SPPC to make sure two machines can work simultaneously. - Bypasses are needed both for CEPC and SPPC to avoid the detectors. Proton machine can only bypass from the outside. SPPC is about 20 years later than CEPC If CEPC is the outer ring Add bypasses in IR and RF new difficulties for the first-stage project CEPC bypasses need to wait the fix of SPPC design Future SPPC s geometry lose freedom - - -

3. Compatibility with e-P collision Keep the possibility of future e-P collision program. e-P collision prospect needs same circumference for CEPC and SPPC. The inner ring has to been enlarged in the future. - Large modification of geometry for SPPC due to hard bending - Much easier for e- machine to adjust the circumference (local modification)

4. SR distribution inside tunnel Lead shielding in all magnets for CEPC collier ring. - SR on the outside is reduced significantly. Little difference of energy deposition and radiation dose between two sides of tunnel (Ref page 70 of CDR) dipole quadrupole sextupole

5. Position of auxiliary tunnel-case I CEPC inner ring, SPPC outer ring, auxiliary tunnel inner side Disadvantage: Inconvenient to enter auxiliary tunnel for person (bridge) No way to move out/in heavy/large equipments SPPC s auxiliary tunnels will be closed (assuming SPPC s auxiliary tunnels are on the outer side ) Score of case I: 1 comfortable First 20 years 20 years later 2/3 2 uncomfortable CEPC SPPC 2/3 3 3 not work

6. Position of auxiliary tunnel-case II CEPC inner ring, SPPC outer ring, auxiliary tunnel outer side Disadvantage: CEPC s auxiliary tunnel will be closed after SPPC is finished. No way to build SPPC s auxiliary tunnels Possible solution: bypass tunnel 1 comfortable 2 uncomfortable Score of case II: 3 not work First 20 years 20 years later 1 3 ( 2) 3 ( 2) CEPC SPPC

7. Summary Positional relationship between CEPC and SPPC: comprehensive consideration of construction schedule and accelerator physics. - CEPC inner ring, SPPC outer ring Difficult to make choice for the position of auxiliary tunnel trade-off - Putting auxiliary tunnel to the outer side is the best choice at this stage.