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Damping ring layouts for CDR

This document outlines the complex layout of damping rings, including electronic positron (e+) and electron (e-) damping rings (DR) with a circumference of 420.76 m and 383.95 m respectively. The design features a race-track shape with long straight sections (LSS) and significant arc lengths. It discusses photon dumps, transfer lines, pre-damping rings, and issues related to interference in injection and extraction lines. The proposal emphasizes a single delay loop for efficient species recombination, highlighting the impact on booster linac connections.

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Damping ring layouts for CDR

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  1. Damping ring layouts for CDR Yannis PAPAPHILIPPOU June, 9th2010

  2. Damping Rings Complex layout X-ray dump e- PDR to DR transfer line e- Damping Ring e- DR to Booster linac transfer line X-ray dump e+ linac to PDR transfer line e- Pre-damping Ring e+ Pre-damping Ring e- linac to PDR transfer line X-ray dump e+ DR to Booster linac transfer line e+ Damping Ring e+ PDR to DR transfer line X-ray dump

  3. Damping rings • 4 rings • e+ and e- pre-damping rings (PDR) with • Circumference of 383.95m • Race-track shape with long straight section (LSS) length of ~96.5m and arcs length of ~95.5m (radius of ~30.4m) • 2 photon dumps/ring at the end of the LSSs downstream of the wigglers • They may be stacked vertically to occupy the same tunnel, but • Transfer line to the damping rings may not be realistic • Interference of the photon damps with injection and extraction line from the other ring may be an issue • e+ and e- damping rings (DR) with • Circumference of 420.76m • Race-track shape with long straight section (LSS) length of ~151m and arcs length of ~119m (radius of ~37.8m) • 2 photon dumps/ring at the end of the LSSs downstream of the wigglers

  4. Transfer lines and delay loop • Damping ring complex lines • 8 transfer lines • Two lines from injection linac to e+ and e- PDR • Two lines from e+ and e- PDR to DR • Two lines from e+ and e- DR to Delay loop • Two lines from Delay loop to booster linac • None of these lines is designed yet and the layout of the complex strongly depends on them • Delay loop • Proposal to have only one delay loop between the damping rings and recombine different species in consecutive delay loop turns • Impact on the length of the lines from Delay loop to booster linac which have to absorb the length difference equal to the delay loop circumference • Racetrack with circumference of 210.4m • It can be reduced if trains are injected asymmetrically into the DR • Relatively long arcs (~95m) and short LSS (~20m)

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