arXiv subjects
Publications and source records attributed to Ken Takayama.
A single RF bunch in the KEK proton synchrotron was accelerated with an induction acceleration method from the injection energy of 500 MeV to 5 GeV.
A new type of charge-exchange injection scheme for high-intensity proton rings that use a laser beam and an undulator magnet is proposed. The elementary stripping process is resonant photoionization via a broad Stark state formed by the Stark effect at an energy level near the peak of the potential barrier. The method used to estimate the parameters of the necessary laser beam and magnetic field is described. As an application to an actual accelerator, a laser stripping system using a high-finesse Fabry-Perot resonator and an undulator is proposed. An estimation of the photon loss due to the pumping-up of H$^0$ atoms, tunability of the system and the emittance growth due to stripping in the undulator magnet is also given.
A novel concept of a high luminosity hadron collider is proposed. This would be a typical application of an induction synchrotron being newly developed. Extremely long bunches, referred to as superbunches, are generated by a multi- bunch stacking method employing barrier buckets at the injection into the collider, and are accelerated to the collider energy with an step-voltage induced in the induction gaps. Superbunches intersect with each other, yielding a luminosity of more than $10^{35} /cm^2/sec$. A combination of vertical crossing and horizontal crossing can be used in order to avoid any significant beam-beam tune shift.