Transcript EXPERIMENTAL FACILITIES OVERVIEW

PS2 meeting
Towards an NMC Ring:
Dispersion suppressor & long
straight section
Y. Papaphilippou
October 24th, 2007
Outline
The short NMC module
 Dispersion suppressor
 Arc
 Straight section
 Summary

24/10/07
PS2 Meeting, Y. Papaphilippou
2
The “short” NMC module

1 asymmetric FODO cell
with 4 + 2 bends and a
low-beta doublet







Phase advances of
272o,260o per module
γt of 10i
Five families of quads,
with max. strength of
0.1m-2
Max. beta of around 60m
in both planes
Min. dispersion of -2.3m
and maximum of 4.6m
Chromaticities of -1.1,-1.7
Total length of 71.72m

24/10/07
Slightly shorter (~1.1m)
than last time to
accommodate dispersion
suppressor
PS2 Meeting, Y. Papaphilippou
3
Dispersion suppressor cell




Similar half module as for the NMC with 2+5 dipoles (instead of 2+4)
Using 4 families of quads to suppress dispersion, while keeping beta functions “small”
Maximum beta of 70m
Total length of 77.31m

5 NMC modules + 2
dispersion suppressor
cells







The NMC arc
Phase advances of
(10.4π,10.2π) – not
matched
γt of 11.6i
9 families of quads, with
max. strength of 0.1m-2
Max. beta of around
73m in horizontal and
64m on the vertical
plane
Dispersion of -2.3m and
maximum of 4.6m
Chromaticities of -7.5, 11.9
Total length of 513.22m

24/10/07
Slightly longer than
FODO arc (2.6m)
PS2 Meeting, Y. Papaphilippou
5

Adding a straight
section with 7 FODO
cells, using 2 matching
quadrupoles








Closing the ring…
Straight drift of 9.5m
Tunes of (12.1,11.4) –
not matched
γt of 12.1i
13 families of quads,
with max. strength of
0.1m-2
Max. beta of around 71m
in horizontal and 68m in
the vertical plane
Dispersion of -2.3m and
maximum of 4.6m
Chromaticities of -16.7,
-25.8
Total length of 1346m
24/10/07
PS2 Meeting, Y. Papaphilippou
6
Summary




Short NMC cell with dispersion suppressor and straight
section with almost the same space characteristics as the
FODO ring
Low imaginary transition energy
“Reasonable” optics functions
In progress
 Dispersion suppressor refinement
 Matching to the straight section
 Module length optimisation
done
 Linear optics optimisation
 Beta function minimisation
 Working point matching and tunabilty
 Chromaticity correction
 Dynamic aperture evaluation
24/10/07
PS2 Meeting, Y. Papaphilippou
done
done
7