Electron Cooling Work Plan for New Strong Cooling

Electron Cooling Work Plan for New Strong Cooling Baseline New strong cooling with 2. 0 (3. 2) n. C/bunch electron beam repeatedly used for 20 times in cooling Two cases: 1 – 63. 3 Ge. V CM, 1. 2/0. 6 mm-mrad proton beam 2 – 44. 7 Ge. V CM, 1. 0/0. 5 mm-mrad proton beam Tasks: (consulted with D. Douglas and C. Tennant) 1. Rerun the IBS and electron cooling simulations for the new cases using existing code 2. Test phase space sampling 3. Implement new friction force formula in simulations 4. Ultimately combine the cooling simulation with the tracking simulation of the circulator ring He Zhang ---1 ---

Electron Cooling Work Plan for New Strong Cooling Baseline 1. 2. 3. Rerun the IBS and electron cooling simulations for the new cases using existing code • Run simulations to find the electron current needed to maintain the proton emittance • Find the best performance with the available electron current Test phase space sampling • Simulate the cooling of a group of protons in turn-by-turn manner for a short period of time • Compare the turn-by-turn result with simulations using larger step size • Increase the ion numbers and the simulated time length • Confirm our sampling method or improve it. Implement new friction force formula in simulations • Understand Slava’s new formula and implement it in our code • Reproduce above simulation results • Work together with Slava in parallel with tast 1 & 2 He Zhang --2 --

Electron Cooling Work Plan for New Strong Cooling Baseline 4. Ultimately combine the cooling simulation with the tracking simulation of the cooler ring Stage 1: Treat the cooling and the tracking in cooler ring separately. • Assume electron bunch only changes in the cooler ring, no change in cooling • Use the 20 different electron bunches in cooling Stage 2: Combine the cooling and tracking in cooler ring • Receive an electron bunch • Use the electron bunch in cooling and update the electron bunch • Give the electron bunch back to tracking in the cooler ring • Repeat 20 times Stage 2 needs a great effort. So far, the change of the electron property due to the cooling process is always ignored. Need theoretical, modelling, and coding work. Schedule End of 2016 1 – 1. 5 month (Jan) 1 – 1. 5 month (Feb) ? Task 1 Task 2 Task 3 He Zhang Task 4 --3 --