1. First look at final focus part of super-B factory
March 16, 2006
Andrei Seryi

2. Config. & parameters from Pantaleo
Configuration:
Parameters:
Energy: 5GeV
Emittances(n): 4*0.02 E-6 m
IP betas: 17.6*0.08 mm
IP sizes: 2.68* um
IP divergence: *159.8 urad
Energy spread: 0.1%

3. Design of FF Use NLC/ILC like final focus
Use L*=0.5m (also tried L*=1m)
Angular dispersion at IP is 70urad (half of the x-divergence at 0.1% energy spread)
Design can be further optimized…

4. Optics of FF

5. Final doublet part

6. Bandwidth from MAD

7. Chromaticity along the ff
Some lengthening would help to decrease non-FD chromaticity

8. Remaining aberrations and tracking
Aberration terms from Transport
Tracking with Turtle (100k particles):
sge=0.1%
sigma_x,y = , um
sigma/sigma_0 = ,
Remaining terms probably can be decreased further if they are important

9. Tracked bandwidth

10. Magnets
Assumed that most of quads have r=1cm, L=0.5m and pole tip field in the optics is no more than 5kGs
For FD:
QF1: r=1.5cm , L=0.4m, B=6.4kGs
QD0: r=1cm, L=0.5m, B= 7.4kGs

11. IR layout With L*=0.5m has to use common QD0? Needs to be looked…
If the L* would be ~0.8m, one can use separate beamlines with BNL direct wind compact quads, similar as for ILC 20/14mrad IR:
ILC IR layout, self-shielding QD0 proposed by Brett Parker, and production of quad test for ILC at BNL. This self shielding QT was recently successfully tested.

12. Summary Optics of FF can be designed
Requirements of the ring to aberrations in FF need to be checked
IR layout need to be discussed