1. ILC BDS LATTICE DESIGN WITH TDR PARAMETERS
E. MARIN
August 21st, 2014

2. Lattice Modifications
Insert a monitor between QF7 (BPMQF7)
Split QF7 in 2 magnets separated by 0.8 m
(KQF7A = KQF7B)
All Quads of FFS are re-matched to TDR parameters
Sexts (FFS) and Octs (FD) are optimized against s*
Starting Lattice (ECM = 500 GeV): ILC2014a

3. Lattice Design Process§
Starting from IP to Collimation section (reverse sense of beam)
Set a at the exit of FD by adjusting QD0 and QF1
Adjust magnets from QD2 to QF7 to impose
a=0 at MIP
Dm = np between MIP and IP
Dm = np between Feedback and IP
RiiSF = 1
RiiSD = -1
Adjust QMs to constraint
Dm = np/2 between SP4 to IP
Dm = np/2 between SPEX to IP
Starting from Collimation section to IP (beam sense)
Optimize Sexts and OCTs against IP spot size
Further optimization by adding magnets from QD2 to QF7 for compensating 3-order aberrations: U1222, U3224, U
§Following partially the recipe described at SLAC- PUB-9895

4. L* = 3.51 m
b*x = m
b*y = m
a*x,y = , 0.05
aMIPx,y = 0.07 ,
h*x = 0.5 mm
s*x = 492 nm
s*y = 5.95 nm
L = ___ cm2s-1
DmMIPx,y [2p] = 1.0 , 1.0
DmSP4x,y [2p] = , 2.15
DmSPEXx,y [2p] = , 2.74

5. L* = 3.51 m IP spot size (2 order) is: 480 nm and 5.80 nm

6. L* = 4.5 m
h*x = 0.2 mm
s*x = 486 nm
s*y = 5.8 m
L = 1.4 · cm2s-1
b*x = m
b*y = m
a*x,y = , 0.01
aMIPx,y = 0.08 , 0.02
DmMIPx,y [2p] = 1 , 1
DmSP4x,y [2p] = 2.7 , 2.3
DmSPEXx,y [2p] = 2.3 , 1.7

7. Energy Bandwidth
L* = 3.51 m
L* = 4.5 m

8. Alignment Tolerances L*=3.51 m

9. Alignment Tolerances L*=4.5 m

10. Alignment Tolerances L*=3.51 m L*=4.5 m

11. Strength Tolerances L*=3.51 m L*=4.5 m