ILC Damping Ring Lattice Status Report. Louis Emery and Aimin Xiao Argonne National Laboratory Presented at KEK workshop Dec 18th, 2007
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1 Status Report Louis Emery and Aimin Xiao Argonne National Laboratory Presented at KEK workshop Dec 18th, 2007
2 Outline New 8-fold symmetric lattice on ILC Cornell wiki pages, as of 12/18/2007 Separated injection/extraction line Lumped injection/extraction kickers (10 kv pulsers) RF sections adjusted to accommodate SC rf cavities Phase trombone Circumference-adjustment chicane Dynamic Aperture Next iteration to be completed soon (not in time for 12/18/2007) Go back to separated groups of kickers (7 kv pulsers) Path length adjusters split unequally among injection and extraction section (from FODO cell alternative) FODO-cell alternative lattice (separate talk) All straight-section features in two sections DA performance comparison Near term deliverables L. Emery and A. Xiao, 12/18/07 2
3 ILC Damping Ring RDR Lattice (OCS8) Ring's Layout Separated Injection/Extraction New lattice has 8 symmetries, with new rf; chicane; injection; extraction; and phase adjustment trombone. L. Emery and A. Xiao, 12/18/07 3
4 Optical Functions L. Emery and A. Xiao, 12/18/07 4
5 Main Parameters L. Emery and A. Xiao, 12/18/07 5
6 Lumped Injection/Extraction Line (now superceded) Injected beam Design of Injection/Extraction Strength of fast strip-line kicker is very weak. With 70 mm gap and 10 kv pulser voltage on opposite strip-lines, 23 strip-line kickers are needed, and can be put into one straight section. Extraction line is the same as injection line but with fewer strip-line kickers. L. Emery and A. Xiao, 12/18/07 6
7 RF Section + Phase Adjustment Trombone Now have enough space for the SC rf cavities with end-components. Cavities from different rings can not be stacked on top of each other. Need to preserve free space for future 6-mm bunch length operation. The required rf section length is about 4 times of previous design and is suitable for occupying a stand alone straight section. RF (future) RF (10 cavities) Phase Trombone e- ring Phase Trombone Both section types have similar lattice configuration. So some quadrupole magnets are directly above another. Two rf section section in a ring RF (10 cavities) RF (future) e+ ring L. Emery and A. Xiao, 12/18/07 7
8 RF Section + Phase Adjustment Trombone Has ability to install rf cavities (total ) Phase trombone has adjustment ability of +/ (total +/- 0.5) RF0 RF Phase Trombone L. Emery and A. Xiao, 12/18/07 8
9 Circumference Adjustment Chicane Max. path length Make this nominal path length Min. path length Adjustment ability: ±7.5 mm Emittance dilution: ~15% Total 4 cells L. Emery and A. Xiao, 12/18/07 9
10 Dynamic Aperture Without Multipole Errors Injection beam size: 20 mm (H) x 12 mm (V) L. Emery and A. Xiao, 12/18/07 10
11 Dynamic Aperture with Multipole Errors Injection beam size: 20 mm (H) x 12 mm (V) Error specified by Y. Cai (SLAC). The original data is for bore radius of 50mm. We scaled the data to bore radius of 30mm. Larger magnet size (= weaker multipole error strength) gives larger dynamic aperture. L. Emery and A. Xiao, 12/18/07 11
12 Summary of work as of Nov New injection/extraction configuration with one group of kickers To be changed in next version The circumference was adjusted to suit the new rf harmonic number New rf region for accommodating large SC rf cavity Added phase trombone (may not be needed) and chicane The dynamic aperture had been checked with and without error L. Emery and A. Xiao, 12/18/07 12
13 Realistic Septum and Kickers for Injection Possible DC Septum performance (from Daphne) 1 DC Septum Beam Required Length Sheet SPInj.1 SPInj.2 SPInj.3 Separation Field Thickness 4 mm T 1 m 1.5 mm 10 mm 0.4 T 0.5 m 6 mm (water cooled) 23 mm 0.8 T 0.8 m >= 12 mm (water cooled) Strip-line Kicker ± 7.5 KV per strip-line 35 mm radius Beam occupy region < 28 mm (to avoid bad field region) 36 strip-lines for injection; 22 strip-lines for extraction 1 M. Modena, H. Hsieh and C. Sanelli, High Current Density Septa for DA NE Accumulator and Storage Rings L. Emery and A. Xiao, 12/18/07 13
14 Injection Line kickers Septum (off) Beam direction Stored-beam envelope L. Emery and A. Xiao, 12/18/07 14
15 Injection Line kickers Septum (on) Beam direction L. Emery and A. Xiao, 12/18/07 15
16 Injection Line 180 deg. kicker Chicane L. Emery and A. Xiao, 12/18/07 16
17 Extraction Line kickers Septum (off) L. Emery and A. Xiao, 12/18/07 17
18 Chicanes L. Emery and A. Xiao, 12/18/07 18
19 Dynamic Aperture Injection beam size: 20 mm (H) x 12 mm (V) Aperture comparable to before the injection change L. Emery and A. Xiao, 12/18/07 19
20 FODO cell Evaluation Alternate DR with FODO cells and differently-configured straight sections Fewer quadrupoles and more dipoles Initial estimate is that DA for FODO cells in arc by itself is really no worse or no better than TME cells Result is that both lattices have DA that exceeds requirements Note that original gain in DA for TME-cell is due to phase advance optimization in straight-section May be applicable to FODO cells Not tried with FODO cells L. Emery and A. Xiao, 12/18/07 20
21 Near-Term Deliverables Transfer lines Collimation L. Emery and A. Xiao, 12/18/07 21
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