1. Towards an NMC lattice for PS2
PS2 meeting
Towards an NMC lattice for PS2
Y. Papaphilippou
August 22nd, 2007

2. PS2 Meeting, Y.Papaphilippou
Original NMC arc
Starting from the “high-filling” factor arc of Christian
Phase advances of 280o,320o per module
γt of 8.2i
Four families of quads, with max. strength of 0.095m-2
Max. horizontal beta of 67m and vertical of 43m
Min. dispersion of -6m and maximum of 4m
Chromaticities of -1.96,-1.14
Total length of 96.2m
Possibility to reduce further the transition energy by moving more bends towards areas of negative dispersion
22/08/2007
PS2 Meeting, Y.Papaphilippou

3. PS2 Meeting, Y.Papaphilippou
An alternative NMC arc
1 FODO cell with bends and an asymmetric low-beta triplet
Phase advances of 320o,320o per module
γt of 6.2i
Five families of quads, with max. strength of 0.1m-2
Max. beta of 58m in both planes
Min. dispersion of -8m and maximum of 6m
Chromaticities of -1.6,-1.3
Total length of 90.56m
Fifth quad family not entirely necessary
Straight section in the middle can control γt
22/08/2007
PS2 Meeting, Y.Papaphilippou

4. PS2 Meeting, Y.Papaphilippou
Other phase advances
320o, 280o with γt of -7.5
280o, 320o with γt of -10.4
Flexible phase advance tuning between 240o and 330o in both planes, but low phase advance solutions do not provide negative momentum compaction
22/08/2007
PS2 Meeting, Y.Papaphilippou

5. PS2 Meeting, Y.Papaphilippou
Dispersion suppressor
Two extra families of quadrupoles for setting dispersion to zero
Matching not perfect (beta functions slightly large) but a good starting point
22/08/2007
PS2 Meeting, Y.Papaphilippou

6. PS2 Meeting, Y.Papaphilippou
Remarks
Total arc length of 560 meters, letting 225m of straight sections
To be done
Dispersion suppressor refinement
Matching to the straight section
Module length optimisation
Minimise quadrupole families number
Systematic phase advance scanning
Working point matching
Chromaticity correction
Dynamic aperture evaluation
22/08/2007
PS2 Meeting, Y.Papaphilippou