Sawtooth effect in CEPC PDR

Investigates the sawtooth effect in the CEPC project. The study, conducted by PDRSha Bai and colleagues, delves into the complexities of this phenomenon. The paper discusses the findings, implications, and potential applications of the sawtooth effect in the context of the CEPC project. Insightful analysis and detailed exploration make this study an essential read for researchers in the field.

• CEPC
• Sawtooth Effect
• Exploratory Study
• PDRSha Bai
• Physics

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Uploaded on Feb 16, 2025 | 0 Views

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Presentation Transcript

1. Sawtooth effect in CEPC PDR Sha Bai, Yiwei Wang, Huiping Geng, Chenghui Yu, Feng Su, Tianjian Bian, Jie Gao CEPC-AP-meeting 2016-11-25

2. Introduce sawtooth method Scale magnets Add RADCOD;CODPLOT in SAD newest version

3. Scale magnets Scaling B,Q,S magnets in all arc section Lattice version: CEPC-ARC4-PDR3-IR1 Energy loss of each B magnet=U0/Bnumber

4. Without sawtooth

5. With sawtooth

6. Twiss parameters comparison NO Sawtooth Sawtooth x y x* y* x z 0.0800001 0.0791565 0.2200000 0.2162617 0.219915 0.220747 0.001000 0.001013 2.15121nm 2.25805nm 3.38423E-6 m 3.89783E-6 m Bunch length 2.53716622 mm 2.92415163 mm

7. Dynamic aperture comparison y y y y 140 140 dp p 2 120 dp p 2 120 dp p 1.5 dp p 1.5 100 dp p 1 100 dp p 1 dp p 0.5 dp p 0.5 80 80 dp p 0 dp p 0 dp p 0.5 dp p 0.5 60 60 dp p 1 dp p 1 dp p 1.5 dp p 1.5 40 40 dp p 2 dp p 2 20 20 x x x x 40 20 0 20 40 40 20 0 20 40 No sawtooth With sawtooth Off-momentum DA reduced obviously.

8. Introduce sawtooth method Scale magnets Add RADCOD;CODPLOT in SAD newest version

9. Without sawtooth

10. With sawtooth

11. Twiss parameters comparison NO Sawtooth Sawtooth x y x* y* x z 0.0800001 0.0809842 0.2200000 0.2189670 0.219915 0.219713 0.001000 0.001081 2.15121nm 5.2697nm 3.38423E-6 m 3.67405E-6 m Bunch length 2.53716622 mm 2.83797076 mm

12. Dynamic aperture comparison y y y y 140 140 dp p 2 120 dp p 2 120 dp p 1.5 dp p 1.5 100 dp p 1 100 dp p 1 dp p 0.5 dp p 0.5 80 dp p 0 80 dp p 0 dp p 0.5 dp p 0.5 60 60 dp p 1 dp p 1 dp p 1.5 dp p 1.5 40 40 dp p 2 dp p 2 20 20 x x x x 40 20 0 20 40 40 20 0 20 40 With sawtooth No sawtooth Off-momentum DA reduced obviously.

13. Conclusions With sawtooth effect, tune change at 3 digits after the decimal point. Off-momentum DA reduced a lot with sawtooth effect.