Abstract
The Future Circular Collider (FCC-hh) beam dump system must provide a safe and reliable extraction and dilution of the stored beam onto a dump absorber. Energy deposition studies show that damage limits of presently used absorber materials will already be reached for single bunches at 50 TeV. A fast field rise of the extraction kicker is required in order to sufficiently separate swept single bunches on the extraction protection absorbers in case of an asynchronous beam dump. In line with this demand is the proposal of a highly segmented extraction kicker system which allows for accepting a single kicker switch erratic and thus, significantly reduces the probability of an asynchronous beam dump. Superconducting septa are foreseen to limit the overall system length and power consumption. Two extraction system concepts are presented and evaluated regarding overall system length, energy deposition on absorbers, hardware requirements, radiation issues, and layout flexibility.
Highlights
The Future Circular Collider (FCC-hh) dump systems have to abort the beam in a safe and reliable way at any energy level between injection and collision
In order to avoid an uncontrolled sweep of particles during the extraction kicker field rise, one or several abort gaps are considered in the filling pattern
The FCC baseline layout considers extraction and collimation systems in one straight section which requires careful studies of radiation impact to electronics. This single extraction concept is dominated by protection absorber limits for single bunch dilution and bunch separation
Summary
The Future Circular Collider (FCC-hh) dump systems have to abort the beam in a safe and reliable way at any energy level between injection and collision. The high beam rigidity and stored beam energy at collision energy, see Table I, pose a serious challenge for the extraction and dilution systems, respectively. Failure cases within the system which could lead to an asynchronous beam dump are of special concern and dominate the system design
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