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Design of Damping Ring Injection and Extraction Region (DRIX) at SLAC

The Damping Ring Injection and Extraction Region (DRIX) is a crucial component of the global design effort for damping rings at SLAC. The design features a shared 5 m inner diameter tunnel housing two damping rings situated above one another, with 1.444 m of separation between beam centerlines. The DRI and DRX lines are strategically placed on the outside of the rings, facilitating the necessary optics and beamline configurations. Continued exploration of the tunnel layouts, including service tunnels and cryomodules, is ongoing to optimize functionality and accessibility in a compact space.

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Design of Damping Ring Injection and Extraction Region (DRIX) at SLAC

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  1. Damping Ring Injection and Extraction Region (DRIX) PT SLAC Global Design Effort

  2. Damping Rings • DRs share a 5 m ID tunnel • One ring above another • 1.444 m separation between beam center lines • Plenty of room for an aisle, etc. • Is the aisle on the inside or the outside of the ring? Global Design Effort

  3. Damping Rings (2) Another view of the DR housing, where the wigglers sit one over another. Note the very large distance from the beam to the left wall of the tunnel. Global Design Effort

  4. DR Inj / Ext lines (DRI / DRX) • Optics design done • Thanks, Ina! • DRI and DRX are definitely on the outside of the ring • Well, Duh! • Each side of DR complex has 1 DRI and 1 DRX • At same elevations as DRs • Final angles: • DRI: 242 mrad (13.9°) • DRX: 215 mrad (12.3°) Global Design Effort

  5. LTR and RTML • LTR connects to DRI • DRX connects to RTML • All 4 beamlines sit together in 1 tunnel • Tangent to DR tunnel • Has a service tunnel • Current optics has an x offset between LTR and RTML • Max value ~2 m • Easy to adjust • Source and RTML continue straight off the left edge of the figure Global Design Effort

  6. LTR and RTML (2) Better View of the Central Injector Complex Tunnels, etc. Note that tunnels are 4.5 m ID, like the main linac tunnel. Both sides need to have cryomodules for sources; e+ side also needs KAS and e+ transfer line from undulator Global Design Effort

  7. LTR and RTML (3) Reminder of what a 4.5 m ID tunnel with cryomodules and a bunch of other beamlines looks like inside Are there any personnel crossovers between the LTR/RTML beam tunnel and the service tunnel? Global Design Effort

  8. My Preference • Keep the source and RTML lines at the elevations of their DRs, all the way out to the escalator beamlines 1 km away • Can e- cryomodules be on the ceiling? • Does this really work in a 4.5 m ID tunnel? • Make the e+ DR the lower of the two • Positron KAS can rest on the tunnel floor • What does the area with the KAS, e+ CMs, e- RTML beamline look like, anyway? • Put the DR on the outside of the DR tunnel, put the aisle on the inside • Put the LTR/RTML aisle on the side of the beamline furthest from the DR • What important questions and issues have I missed? Global Design Effort

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