Suggested Plan for Ion Collider Ring Studies Suggested

Suggested Plan for Ion Collider Ring Studies Suggested plan for single-particle nonlinear-dynamics studies of the ion collider ring Short/medium-term goals: I. Collision optics 1. Complete coherent orbit compensation in the detector solenoid a. Finish the study of different corrector schemes (correctors inside, outside and on both sides of the FFQs) and summarize the results b. Develop a tilted solenoid model consisting of straight solenoids and kicks for implementation in Elegant (consult Yuri if needed) c. For compensation schemes with orbit excursion inside the FFQs, study impact of the excursion and FFQ multipoles on the dynamic aperture 2. Do a bottom-up analysis of the multipole tolerances of large-beta dipoles 3. Study and optimize closed orbit correction and magnet (especially FFQ) alignment requirements with correctors near FFQs 4. Combine misalignments, strength errors, detector solenoid, magnet multipoles and all corrections for a complete simulation of the dynamic aperture II. Injection optics 1. Study closed orbit correction using misalignment and strength error tolerances found for the collision optics 2. Combine misalignments, strength errors, detector solenoid, magnet multipoles (all found in the collision optics studies) and all corrections for a complete simulation of the dynamic aperture V. S. Morozov and G. H. Wei 5/19/16 1

Current Model in MADX and Problem Current Model: SOLDETUS: solenoid, l=1. 6; use, sequence=ORBIT 00; select, flag=error, pattern="SOLDETDS"; ealign, DTHETA: =-0. 05; select, flag=error, pattern="SOLDETUS"; ealign, DTHETA: =-0. 05; Problem: I. Can’t be split. Closed Orbit will be different. I. SOLDETUS: solenoid, l=1. 6/10; 10* SOLDETUS II. If Solenoid was symmetric at IP with 3. 2 m length, Closed orbits are also different at the entrance and at the end. * NAME "DFFUS 0103" "SOLDETUS" "IP" "SOLDETDS" S X 21. 6 9. 609517482 e-05 23. 2 0 24. 8 -0. 0001075794904 V. S. Morozov and G. H. Wei 5/19/16 Y PX PY 1. 153841571 e-06 8. 658645951 e-09 0. 0005993639452 -1. 406858026 e-18 0 -1. 301042607 e-18 -0. 000957690409 -7. 195693996 e-06 -0. 0005992776566 2

Model in LHC with CODE MADX LHC Project Report 929 Transform to MADX: (T, PT) are the longitudinal variables used in MADX V. S. Morozov and G. H. Wei 5/19/16 3