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

2. 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)

3. ERL 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

4. 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 mA 3.5 min mA min mA min
BMAD mA min mA mA min

5. 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

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