A novel concept of hadron therapy allowing tracking irradiation on a moving and deformed tumor target has been proposed (Ken Takayama, “ESCORT”, presented at New Technologies in Hadron Therapy Workshop, IEEE NSS-MIC 2018). The concept is characterized as follows;

a.	Its beam driver is a fast cycling induction synchrotron (20 Hz), where a fully stripped heavy ion beam is delivered from the laser ablation ion source, the injected ion beam is captured in the barrier bucket and accelerated with the induction step voltage, a beam spill is continuously extracted by the energy sweep extraction method combining the programed barrier bucket leak and the lattice characteristics with the localized large momentum dispersion function (Leo K.W et al., Phys. Rev. Accel. & Beam 19, 042802, 2016).
b.	A combination of beam profile monitors and the full-body Liq. Xe 3 camera is used to obtain the dose profile/position in depth by detecting prompt s. The accompanied X-ray camera also catches the position/profile of the tumor target. Signals are quickly processed in computers and the irradiation errors are found at 20 Hz.
c.	The errors signals are transferred to the switching power supply energizing the induction cells to adjust the extraction timing. The position error signals are feedbacked to the fast deflecting magnet, which is excited with a different current every cycle so as to realign the scanning beam spot on the desired position.

Energy sweep compact rapid cycling hadron therapy (ESCORT)