Speaker
Description
SAMEER has proposed First Heavy Ion Therapy in India in collaboration with Tata Memorial Centre, Mumbai and KEK, Japan. The hadron driver in the proposal is based on a fast cycling induction synchrotron. Its main features are injector free, multi species of ion acceleration capability, fast cycling at 10 Hz repetition rate, energy varying 1 turn fast extraction and energy sweep extraction. These extraction mechanisms are designed specifically for treatment purpose. In the fast extraction mode, C+6 ions are extracted at any desired energy in each acceleration cycle. The extraction is assisted by an off momentum bump orbit of ions with a combination of a kicker and septum magnet. In the energy sweep extraction mode, C+5 ions are continuously leaked from the barrier bucket at desired energy and those C+5 ions drift inwards in the large dispersion region. A thin stripper foil is placed far from the center orbit of barrier trapped beam and C+5 ion hitting the foil edge gets converted into C+6 ion. The change of charge state results in large deflection in the following bending magnet and helps in extraction of the beam by a single septum magnet downstream. The charge conversion efficiency and desired stripper foil thickness have been confirmed by extensive simulations *. To realize India’s first heavy ion therapy (IndoCure), the staged plan is under consideration, where targeting fixed beam lines are expected at the first stage, with a gantry at the second stage, and then image guided irradiation on the moving target at the third stage.
