Some discussions on the time structure of CEPC

Contents • • Review of the convensional CEPC injection Undulator based positron source Time

Review of the CEPC beseline injection 6 Ge. V Energy Ramp 6 ->120 Ge.

Lifetime Lum Drop Charge Drop Bunch Charge Injection Period 30 min 10% 5% 2.

For injection from zero current, higher injection frequency is needed, 60 s for instance

120 Ge. V Positron 6 Ge. V Electron 6 Ge. V positron Stacking ring

Time Structure • Step 1: Electron Injection— 1 s? 6 Ge. V Linac Electron

• Step 2: Booster Ramp— 5 s Energy Ramp 6 ->120 Ge. V

• Step 3: photon production 100 turns for 120 Ge. V: — 0.

• Step 4: Booster Ramp Down— 5 s Energy Ramp 120 ->6 Ge.

• Step 5: Acceleration and bunching of the Positrons run parallel with step

• Step 6: Injection into the booster and ramp up — 10 s

• Summary of the time structure 1 s Electron Injection 5 s Energy

Problems • • Pre-acceleration of the Positrons to 6 Ge. V Bunching of the

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Some discussions on the time structure of CEPC injection Considering an undulator based positron source Speaker: Cui Xiaohao IHEP

Contents • • Review of the convensional CEPC injection Undulator based positron source Time structure with polarized positron source Problems

Review of the CEPC beseline injection 6 Ge. V Energy Ramp 6 ->120 Ge. V Electron Linac Positron Collider Booster 120 Ge. V

Lifetime Lum Drop Charge Drop Bunch Charge Injection Period 30 min 10% 5% 2. 9 n. C 90 s 30 min 3. 6% 1. 8% 1 n. C 32 s Injection period Injection time

For injection from zero current, higher injection frequency is needed, 60 s for instance I/Ipeak It takes 30 mins to reach the peak current ! Time(min)

Undulator based positron source

120 Ge. V Positron 6 Ge. V Electron 6 Ge. V positron Stacking ring Linac Or Booster? target

Time Structure • Step 1: Electron Injection— 1 s? 6 Ge. V Linac Electron Booster

• Step 2: Booster Ramp— 5 s Energy Ramp 6 ->120 Ge. V Booster

• Step 3: photon production 100 turns for 120 Ge. V: — 0. 018 s 10000 turns for 50 Ge. V: — 1. 8 s

• Step 4: Booster Ramp Down— 5 s Energy Ramp 120 ->6 Ge. V Booster

• Step 5: Acceleration and bunching of the Positrons run parallel with step 4: could be finished within 5 s Stacking ring Linac Or Booster?

• Step 6: Injection into the booster and ramp up — 10 s , ramp down Energy Ramp 6 ->120 Ge. V

• Summary of the time structure 1 s Electron Injection 5 s Energy Ramp up 1. 8 s ? 5 s Positron Production Energy Ramp down 10 s Positron Capture & Accelerat ion & bunching Positron Injection & Acceleration

Problems • • Pre-acceleration of the Positrons to 6 Ge. V Bunching of the positrons Injection into the booster Spin-depolarization in the booster and main ring.

Thank you for your attention!