1. M. Sullivan, G. Yocky PEP-II meeting Feb. 26, 2007
PEP-II Magnet study
M. Sullivan, G. Yocky
PEP-II meeting
Feb. 26, 2007

2. What this is A look at the magnet RMS (ripple) values
Made a spread sheet of all LGPS supplies
RMS calculation is complicated

4. Magnets in question
HER
B3, B3M
BLF
SQ4L
SQ3L
SQ3R
SQ2L
SQ2R

5. B3 History
1997 to now

6. BLF
Point is that BLF is very different from BLFM
1997 to now

7. SQ4L compared to SQ4R
SQ4R 2001 to now
1997 to now
SQ4L
SQ4R

8. SQ3L and SQ3R Histories
1997 to now
SQ3L
SQ3R

9. SQ2L
SQ2L and SQ2R
SQ2L 2005 to now
1997 to now
SQ2L
SQ2R

10. Magnets in Question LER HK1 HK1L SKG1, SKG2, SKG3, SKG4 SK4L, SK4

11. HK1 and HK1L
VK2R
1998 to now
HK1
HK1L

12. Global Skews and Local Skews
All local Skews have this RMS history
SK4
1998 to now
SKG1
SKG4

13. Summary
Several magnets look like they have a larger RMS value than they had in the past
Some supplies have a much larger RMS value than neighboring supplies with similar magnets
Some sets of magnets seem to have the same RMS histories (which are high). This may be some sort of readout problem.
Need to show this data to PEM
Should get ready to swap out supplies when we are convinced we want to