1 Simulations of Tuneshifts for Electron Beams M. Venturini (LBNL) Jan 26, 2009.

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Presentation transcript:

1 Simulations of Tuneshifts for Electron Beams M. Venturini (LBNL) Jan 26, 2009

2 Cesr-TA Experimental data (April07)

3 Comments Simulations done for 11 bunch trains. No witness bunches. All bunches offset horizontally or vertically by same amount (as indicated in slides) For drifts, in the horizontal plane the averaged electric field along the bunch train is positive and largely independent of the bunches offset. The estimated tuneshift is positive but this may not be very meaningful and the estimate may change if one assumes a different closed orbit (presently closed orbit is assumed to occupy the center of the chamber). For dipoles in the vertical plane, the ratio /dy differ by about 30% as dy is varied from 0.5 to 5mm; in drifts the ratio seems about independent of dy

4 E=1.885 GeV betax=19.64 m; betay=18.82m; L drift =174.86m sigmax =2.2mm; sigmay=0.16mm; sigmaz =12.6mm N=1.2E10 part/bunch photpbppm = [=Photons/m per part]; queffp=12% [QE] B=0 blensig =4 refl=0.15 DRIFT:: Input parameters of POSINST runs,etc.

5 DRIFT:: Horizontal motion (dx= +/- 0.5mm) dx=0.5mm dx=-0.5mm

6 DRIFT:: Horizontal motion (dx= +/- 5mm) dx=-5mm dx=5mm

7 DRIFT:: Vertical motion (dy=0.5mm and 5mm) dy=0.5mm dy=5mm

8 E=1.9 Gev betax=15.9 m; betay=18.94m; L regular-dip =377.99m sigmax =1.8 mm; sigmay=0.18mm; sigmaz =9mm N=1.2E10 part/bunch photpbppm = [=Photons/m per part]; queffp=10% [QE] B= T blensig =6 refl=0.15 Regular DIPOLE:: input parameters in POSINST runs, etc Notice that some of the beam parameters e.g. the sizes are slightly different from the “drift” case

9 DIPOLE:: Vertical motion (dy=0.5mm and 5mm) dy=5mm dy=0.5mm

10 DIPOLE:: Horizontal motion (dx= +/- 0.5mm) dx=-0.5mm dx=0.5mm

11 DIPOLE:: Horizontal motion (dx= +/- 5mm) dx=5mm dx=-5mm