Previous two weeks (Feb 6-Feb 17) - JACoW: board of directors telecon - ADMIN: Annual review meetings, CASA group meet - OPS: Hall D run setup/support; BTeam org, beam studies; Optics Feb 7-14 - HALLD: GlueX collaboration meeting/talk (Feb 16-18) - IPAC18: SAB invitation management - JLEIC: Resurrect old gear changing simulations for GHOST collaboration - JLEIC: Reading impedance papers Next two weeks (Feb 20-Mar 3) - OPS: Hall D run setup/support; BTeam org, beam studies; Optics Feb 7-14 - JLEIC: Work/meetings on ion bunch formation strategy - JLEIC: Collective effects, spreadsheet planning and nagging; R&D meet - JLEIC: reading impedance papers, start longitudinal simulations - JLEIC: Start 4/3 gear changing simulations for GHOST paper - IPAC18: Start organizing ideas for invited talk proposals (SPC task)
Previous two weeks (Feb 6-Feb 17) - OPS: Optics support, injector match evaluation - PERLE: lattice re-design, Feb trip/presentation prep Next two weeks (Feb 20-Mar 3) - PERLE: Orsay kick-off meeting - PRAB article review - JLEIC: Booster meetings re injection/parameters
Previous two weeks (Feb 6-Feb 17) - JLEIC: Finish up emittance exchange, including example; document; first pass appears unworkable - JLEIC: Continue work on CCR arc requirements tech note and arc design - ADMIN: Accelerator TRC review memo (later rendered irrelevant) - PERLE: Feb trip/presentation preparation (operations driven I&C) Next two weeks (Feb 20-Mar 3) - JLEIC: Write up of emittance exchange slides/tech note - JLEIC: Return to CCR arc requirements document, CCR architecture concepts document, and ERL/CCR beam exchange system requirements
Previous two weeks (Feb 6-Feb 17) - Feb. 6-10: survey impedance budget studies, prepare and make presentation at the JLEIC R&D meeting - Feb. 13-18: understanding the state-of-art for the potential-well effect and the longitudinal single-bunch instability Next two weeks (Feb 20-Mar 3) - Feb. 20-26: understanding the logic and assumptions of ZAP, and see how its input can be related with the JLEIC database. Estimating JLEIC single bunch effects. - Feb. 27-Mar. 5: further understanding of the state-of-art for transverse single-bunch instabilities - Cheng-Ying needs more time to refine his thesis, so I expect to read and review it in a few weeks
Previous two weeks (Feb 6-Feb 17) - JLEIC: Continue implementing gear changing script model for Guinea Pig for 4/3 gear changing evaluation - JLEIC: Continue evaluating/planning Booster injection design, literature search - ADMIN: Fighting with MFA (took a few days) Next two weeks (Feb 20-Mar 3) - JLEIC: Continue writing PRSTAB paper draft on beam-beam sims, iterate with Daniel Schulte at CERN - JLEIC: Continue implementing gear changing script model for Guinea Pig for 4/3 gear changing evaluation - JLEIC: Finish literature search, start documenting parameters for calculations and future simulations
Previous two weeks (Feb 6-Feb 17) - JLEIC: analysis of CCR-like arc with collective effects (space charge, CSR, space charge + CSR) (it ain't good) - JLEIC: analysis of mitigation of CSR wake using RF cavity in circulator ring (still ain't good) - JLEIC: analysis of merger performance at 2 nC (it ain't good) - JLEIC: started combing through 2 years of notes/slides/TNs/results to summarize work done for the ERL-driven cooler concept (i.e. the previous baseline) Next two weeks (Feb 20-Mar 3) - JLEIC: continue work on aforementioned TN - JLEIC: simulate Slava's/Dave's emittance exchange (probably ain't good)
Previous two weeks (Feb 6-Feb 17) - JLEIC: Continue BLonD simulations of debunch/rebunch with impedance - JLEIC: Longitudinal impedance reading Next two weeks (Feb 20-Mar 3) - JLEIC: Continue BLonD simulations of debunch/rebunch with impedance - JLEIC: Continue Longitudinal impedance reading, calculations - JLEIC: Continue writing outlines of initial dissertation chapters
Accelerator R and D - Y. Zhang
Conceptual development of emittance exchange. Worked out one solution which was proved independently by David Douglas using a different method Unified field theory study
Continued chromaticity compensation studies on electron ring optics and presented the progress in the bi-weekly non-linear beam dynamics meeting. Helped write a document describing the Compton/forward electron detection region in the JLEIC. Provided the electron ring lattice for beam-beam study in the JLEIC. Provided the positron luminosity parameters per nuclear physicists’ request. Miscellaneous: attended the CASA monthly meeting, attended the beam-beam code development meetings, attended JLEIC weekly R&D meetings, attended JLEIC parameter/Ion injector coordination meeting, attended the bi-weekly non-linear beam dynamics meeting, attended the bi-weekly ion polarization meeting, attended the bi-weekly simulation meeting.
Crab crossing: working with Salvador on crab dynamics simulations Beam-beam simulations: generating high-order maps for current collider ring lattices Ion polarization: planning for further work Detector background: documenting detector region configuration Non-linear dynamics: optimization of the electron collider ring Heavy ion tagging LDRD: analysis of forward detection performance Miscellaneous: muon ionization cooling, positron working group and workshop planning, translation of Slava's thesis on electron cooling, detector simulations
Skew PIC: Compared phase space plots and beam sizes over 101 periods in Skew PIC channel for aberration compensation using ordered vs. arbitrary harmonics. Arbitrary harmonics (periodic with Skew PIC cell but not sine/cosine like) tend to give smaller beam size but will need to be optimized using genetic algorithm techniques to handle large variable sets. Started implementing Chebyshev expansion of magnetic field into MADX with the goal of finding better representation of multipole fields needed for aberration compensation. Merger: Working on verifying properties of generated magnetized particle distribution and its transport through the associated "matched" solenoid.
Simulated 10000 events of ePb collision in JLEIC IR section. Preliminary analysis all particles generated by collisions at IP and downstream area, like the exit of the third final focus quadrupole, the exit of the second dipole, and the second focus point. Continuing on dynamic aperture study with tune scan for the JLEIC ion collider ring. Prepare for the proceeding paper in IPAC'17
Developed a program for the JLEIC spring collaboration meeting Developed a plan and had a meeting for the next bunched beam cooling experiment in April Studied report of DOE EIC Accelerator R&D Review Attended various meetings
Computational Physics - Y. Roblin
Diagnostic Development - K. Jordan