Changsheng Song Visit on Saturday 4 July

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Presentation transcript:

Progress in Beam-Breakup Calculations Jim Crittenden ERL@CESR Meeting 9 July 2009

Changsheng Song Visit on Saturday 4 July We found a BMAD bug Now we can reproduce the calculations of ERL-0601 With Changsheng's original code and the latest BMAD With the new BMAD tracking (DCS)

ERL-06-01 Fig. 11 2006 Lattice with PRST-AB 2007 HOMs and 10 Mhz frequency spread Changsheng code with new BMAD 2582 mA New BMAD Tracking 1822 mA

Benchmarking Study Examples from ERL-06-01 Table 9 All runs on processor LNX6166 No Coupling/Df=0/sf=0 Coupling/Df=60MHz/sf=0 Coupling/Df=60MHz/sf=10MHz CS Tracking 21.93 mA 3.5 min 87.0 mA 7.8 min 1978 mA 7.8 min BMAD 2009 21.88 mA 17.2 min 96.7 mA 22.8 2888 mA 22.8 min

BBU Optimization of CERL Optics Now Underway New linac optics received from Chris Mayes No improvement in threshold current so far. This is the first attempt, still much to learn

Two Alternative Sets of Linac Optics (Chris) CERL 7.4 First Optimization Second Optimization