Difference between revisions of "CeC Simulation Meeting"

Revision as of 23:50, 9 November 2017

Meeting Goals

The CeC simulation meeting is focused on developing simulation as well as analytical tools to advance understandings of coherent electron cooling (CeC).

Meeting Agenda

• 10/20/2017:
  • Kicker simulations (Peak current is increased to 25 A and gain at ion is 60. Cooling kick is traced for three ions with reference energy and 0.1% off. The ions with 0.1% energy errors are arbitrarily put into the wave-packet, not according to R56), by Jun Ma;
• 09/29/2017:
  • Kicker simulations (The problem with growing emittance is resolved. The peak current is also reduced to 23 A (gain is 40 at ion). Kick to ion is calculated. Substantial phase slip of ion w.r.t. wave-packets inside kicker is found.), by Jun Ma;
  • Orbit control tool, by Jun Ma;
• 09/14/2017:
  • Kicker simulations (Kicker is treated as a drift section, i.e. no quads. The beam size does no grow linearly and the emittance grows significantly, indicating some problems with the codes.), by Jun Ma;
• 09/07/2017:
  • CeC simulations (Modulator and FEL simulation with reduced beam current, 40A->31A. The gain at ion is ~140. The optimal lattice functions at undulator are found with space charge effects taken into account.), by Jun Ma;
• 08/31/2017:
  • CeC simulations (Modulator and FEL simulation with not-so-matched beam at undulator entrance, beta functions are a factor of two larger. The intention is to see to what extent the beam has to be matched. Current is too large and FEL saturated), by Jun Ma;
• 08/17/2017:
  • Quadrupoles (Attempts to optimize quadrupoles in modulator so that beam is matched to FEL. The target lattice function does not take into account space charge effects along undulator), by Jun Ma;
• 07/20/2017:
  • Modulator simulation(New energy with gamma=28.7, not matched to FEL due to space charge effects), by Jun Ma;
• 04/06/2017:
  • Start-to-end CeC simulation (using smoothed parameters from raw particle distribution, beam not matched to FEL, see beam variation in wiggler from below plot), by Jun Ma;
  • Transverse beam size variation along undulator for the simulation results shown in above slides, by Jun Ma;
• 03/16/2017:
  • Start-to-end CeC simulation (using direct parameters from raw particle distribution via beam dynamics simulation, not much lasing observed), by Jun Ma;
• 03/02/2017:
  • Physics Applications in Matlab, by Igor Pinayev;
  • Updates on Multipacting Simulations, by Irina Petrushina;
• 02/16/2017:
  • Discussion of Jun's result (attempt to explain the 'crossing' in vx-x plot, local 'repulsion' not explained), by Gang Wang;
• 02/02/2017:
  • Study of phase advance in quads, by Jun Ma;
  • Preliminary CeC schedule, by Igor Pinayev;
• 01/19/2017:
  • Discussion of Jun's results (Analytical formula to calculate vx), by Gang Wang;
  • Mathcad spreadsheet to calculate vx and a simple estimate to explain the difference at y=0 and y=0.5sigma, by Gang Wang;
• 01/12/2017:
  • Phase advance in quads with space charge (Continued studies about reversed slope), by Jun Ma;
  • Optimization of laser spot on cathode, by Igor Pinayev;
  • Tomographic Measurement, by Kentaro Mihara;
• 12/22/2016:
  • Closer look at Jun's results (Possible reason about not observing reversed slope for continuous focusing channel), by Gang Wang;
• 12/15/2016:
  • Phase advance in quads (Further simulation studies on the reversed slope), by Jun Ma;
• 12/08/2016:
  • CeC simulation status and forward (summary of the beam dynamic simulation status), by Yichao Jing;
• 12/01/2016:
  • Modulator simulations (More 2D plots for continuous focusing, some results for analyzing the reversed slope), by Jun Ma;
  • Mathcad spreadsheet-a possible explanation of the reversed slope in <vx> , by Gang Wang;
• 11/10/2016:
  • Modulator simulations with linear focusing(added results for moving ion), by Jun Ma;
  • Modulator simulations with quadruple focusing(unexplained reverse slope for <vx> modulation), by Jun Ma;
• 10/27/2016:
  • Modulator simulations with focusing field (Linear focusing plus space charge compensating field, quadruple focusing), by Jun Ma;
• 09/29/2016:
  • Particle initialization and focusing field (benchmarked with MAD-X), by Jun Ma;
• 09/15/2016:
  • Modulator simulation (preparation for paper), by Jun Ma;
• 09/01/2016:
  • Start-to-end CeC simulation (first meaningful results), by Jun Ma;
• 08/18/2016:
  • Start-to-end CeC simulation(saturated due to small number of macro-particles in the slice containing ion), by Jun Ma;
  • Import particles/distributions into Genesis, by Gang Wang;
• 08/04/2016:
  • PIC and Genesis (connecting modulator with FEL, and FEL with kicker), by Jun Ma;
• 07/21/2016:
  • Wiggler simulations (Genesis scaling with number of particles, evolution in kicker), by Jun Ma;
• 07/07/2016:
  • Wiggler simulations (larger domain but no enhancement in modulation observed), by Jun Ma;
• 06/09/2016:
  • Modulator simulations (quads, after fixing a bug causing the 'flat center' in energy modulation) and preliminary dipole (FEL) simulation, by Jun Ma;
• 05/26/2016:
  • Modulator simulations (soft edge quads with longer edge) and preliminary dipole (FEL) simulation, by Jun Ma;
• 04/28/2016:
  • Comparison of modulator simulation with theory (soft edge quads), by Jun Ma;
• 04/14/2016:
  • Comparison of modulator simulation with theory , by Jun Ma;
• 03/31/2016:
  • Modulator simulation in quadruple channel (hard edge quads), by Jun Ma;
• 03/17/2016:
  • Modulator and wiggler Simulation , by Jun Ma;
• 03/03/2016:
  • Modulator Simulation (open boundary condition and continuous focusing field) , by Jun Ma;
• 02/18/2016:
  • Modulator Simulation (open boundary condition) , by Jun Ma;
• 01/21/2016:
  • Modulator Simulation (open boundary condition) , by Jun Ma;
  • CeC electron linac simulation , by Yuan Hui Wu
• 01/07/2016:
  • Comparing Modulator Simulation With Theory , by Gang Wang;
• 12/10/2015:
  • Modulator and Wiggler Simulation, by Jun Ma;
  • Analytical Solution of Fokker-Planck Equation, by Gang Wang
• 10/8/2015:
  • Beam Simulations with ASTRA, by Igor Pinayev