Speaker
Description
A 550 GeV centre-of-mass Higgs factory is presented, the Linear Ghost Collider (LGC). Acceleration and deceleration is performed within an SRF linac where the bunches transported are net neutral, this concept of ghost bunches is introduced in an accompanying paper (Ghost Collider). In common with that proposal, energy is recovered after collision, and particles recycled. LGC comprises an alternative configuration to GC that eliminates turn-around arcs. This enables a large reduction in energy lost to synchrotron radiation, and an increase in luminosity as bunches are degraded less. The key innovation is that within a ghost bunch only the velocities of the charge partners must match, not their energies. Therefore, only one charge partner of each ghost bunch need be accelerated to collision energy. This allows the linac to be split into stages, with one charge partner only accelerated to collision energy divided by the number of stages - these are termed drive bunches. Recirculation is only needed for drive bunches, not colliding bunches. Two variants of LGC are presented: firstly, a pulsed version analogous to GC realisable with existing SRF technology and capable of $\sim 10^{35}$ cm$^{-2}$ s$^{-1}$ @ 100 MW electrical power; and secondly, a continuous-wave (CW) version based on expected parameters for thin-film Nb3Sn on copper SRF technology, capable of $\sim 10^{36}$ cm$^{-2}$ s$^{-1}$ @ 165 MW electrical power.
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