2016-Jul-22 Accel. R and D Biweekly Report

Slava Derbenev

• worked on various issues for JLEIC, particularly strong cooling

Fanglei Lin

• Finished a prototype of an electron collider ring optics with TME-like arc cells and initiated the study of the beam nonlinear dynamics.
• Started the study of the beam nonlinear dynamics in a prototype of an electron collider ring optics with new-magnet FODO arc cells.
• Miscellaneous: attended the bi-weekly non-linear beam dynamics meeting, attended the JLEIC NP oriented meeting, attended the JLEIC modeling meeting, attended a discussion of optimization of JLEIC luminosity.

Vasily Morozov

• Ion polarization: collider injection lattice for spin tracking, orbit correction, debugging Zgoubi
• Crab crossing: working with Salvador, planning, setting up tools and lattices
• Miscellaneous: Skew PIC, detector region discussions, ion complex integration

Amy Sy

• Continued work on compensation of nonlinear effects for Skew PIC channel. Reoptimization of octupoles due to asymmetric particle distribution. Newly optimized octupoles correct the average radial offset to values ~20-30% larger than in previous simulations. Comparison of optimized octupole values for particle distributions with and without momentum spread.
• Continued ERL merger studies in G4Beamline. Studying longitudinal emittance growth in the presence of transverse magnetic fields.
• Literature search on polarized ion sources in context of JLEIC required parameters.

Guohui Wei

• Start research on Ground Motion Activities at the JLEIC
• Submit An abstract to NA-PAC'16.
• Vertical dispersion caused by detector solenoid and its influence on IBS life time

Yuhong Zhang

• Participated in cooling experiment data analyses
• Attended many meetings
• Worked on luminosity performance without cooling
• Worked with colleagues on various JLEIC issues (strong cooling, ground motion and e-ring redesign, etc.)