1. Damping Rings Discussion Session: Implications and Impact of the Central Injector Configuration and Other Layout Issues ILCDR07 Workshop

2. March 5, 2007 ILCDR07 - Frascati 2 Introduction Propose a somewhat more general discussion than just central injector layout issues –Central Injector –General layout considerations and impact on lattice designs What issues do we need to explore in the next 6-12 months?

3. March 5, 2007 ILCDR07 - Frascati 3 injection e+e+ A. Wolski, 9 Nov 2006 Arc 1 (818 m) Arc 2 (818 m) Arc 3 (818 m) Arc 4 (818 m) Arc 5 (818 m) Arc 6 (818 m) short straight A (249 m) short straight B (249 m) short straight C (249 m) short straight D (249 m) long straight 1 (400 m)long straight 2 (400 m) extraction shaft/large cavern A shaft/large cavern C RF cavities wiggler small cavern 1 small cavern 2

4. March 5, 2007 ILCDR07 - Frascati 4 e-e- A. Wolski, 9 Nov 2006 Arc 1 (818 m) Arc 2 (818 m) Arc 3 (818 m) Arc 4 (818 m) Arc 5 (818 m) Arc 6 (818 m) short straight B (249 m) short straight C (249 m) short straight D (249 m) long straight 1 (400 m)long straight 2 (400 m) injection extraction wiggler RF cavities wiggler RF cavities shaft/large cavern A shaft/large cavern C small cavern 1 small cavern 2 short straight A (249 m)

5. March 5, 2007 ILCDR07 - Frascati 5 Central Injector Issues Stacking of Rings –Alignment –Supports and Stability –Survey CF&S –Tunnel Diameter –Number of Shafts Single shaft with all RF? –Number of Major Alcoves Commissioning Issues –Can positron ring be commissioned with electrons?

6. March 5, 2007 ILCDR07 - Frascati 6 Other Layout Issues How to deal with wiggler radiation (~42kW/wiggler)? –Chicanes – Synchrotron radiation dumps –Vacuum chamber heat loads in straights Other?

7. March 5, 2007 ILCDR07 - Frascati 7 Action List for Items to Study