Abstract
The main “bottleneck” limiting the beam power in circular machines is caused by space charge effects that produce beam instabilities. To increase maximally the beam power of a “proton driver”, it is proposed to build a facility consisting solely of a 2.5 GeV injector linac (PI) and a 20 GeV pulsed superconducting linac (SCL). Such a facility could be constructed using the existing KEK accelerator infrastructure. The PI, based on the European Spallation Source (ESS) linac, would serve both as an injector to the SCL and a source of proton beams that could be used to copiously produce, e.g., muons and “cold” neutrons. Protons accelerated by the SCL would be transferred through the KEK Tristan ring in order to create neutrino, kaon and muon beams for fixed-target experiments. At a later stage, a 70 GeV proton synchrotron could be installed inside the Tristan ring. The SCL, comprising 1.3 GHz ILC-type rf cavities, could also accelerate polarized or unpolarized electron beams. After acceleration, electrons could be used to produce polarized positrons, or may traverse an XFEL undulator.
Highlights
The Standard Model (SM) of particle physics is supported by two theoretical “pillars”: the gauge principle and the Higgs mechanism for particle mass generation
The main “bottleneck” limiting the beam power in circular machines is caused by space charge effects that produce beam instabilities
A 70 GeV proton synchrotron could be installed inside the Tristan ring
Summary
The Standard Model (SM) of particle physics is supported by two theoretical “pillars”: the gauge principle and the Higgs mechanism for particle mass generation. To discover a new particle (such as the Higgs boson), or to search for physics beyond the SM, usually requires the use of high-energy hadron or electron-positron colliders. A deeper insight into CP violation is expected to be gained from measurements of ultra-rare kaon decays such as These decays provide important information on higher-order effects in electroweak interactions, and can serve as a probe of new phenomena not predicted by the Standard Model. Pulsed operation is preferred over the CW mode (continuous wave, 100% duty) mainly because the former allows the use of rf cavities with high accelerating gradients This would considerably reduce the overall length of the machine, which is limited by the size of the KEK site. Protons accelerated by the SCL to 20 GeV are transferred through the KEK Tristan ring in order to create beams for various fixed-target experiments.
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