Abstract
A novel scheme for a racetrack-shape fixed field induction accelerator (RAFFIA) capable of accelerating extremely heavy cluster ions (giant cluster ions) is described. The key feature of this scheme is rapid induction acceleration by localized induction cells. Triggering the induction voltages provided by the signals from the circulating bunch allows repeated acceleration of extremely heavy cluster ions. The given RAFFIA example is capable of realizing the integrated acceleration voltage of 50 MV per acceleration cycle. Using 90\ifmmode^\circ\else\textdegree\fi{} bending magnets with a reversed field strip and field gradient is crucial for assuring orbit stability in the RAFFIA.
Highlights
Since 1994, when CNRS-IN2P3 at Orsay demonstrated acceleration of cluster ions to a high energy by using a tandem accelerator, the new field of condensed matter science has rapidly evolved, focusing on nonlinear irradiation effects on target materials, such effects arising from the extremely high energy density of cluster ions [1]
A novel racetrack-shape fixed field induction accelerator (RAFFIA) capable of accelerating cluster ions by induction acceleration has been proposed, with a design based on our broad experience in the development of the induction synchrotron and our design work on the induction sector cyclotron [7]
The large dynamic range of acceleration frequencies arising from the intrinsic nature of the RAFFIA has been described for an example design
Summary
Since 1994, when CNRS-IN2P3 at Orsay demonstrated acceleration of cluster ions to a high energy by using a tandem accelerator, the new field of condensed matter science has rapidly evolved, focusing on nonlinear irradiation effects on target materials, such effects arising from the extremely high energy density of cluster ions [1]. A small-scale induction synchrotron, called the KEK digital accelerator, where heavy ions are directly injected into the ring from a. It turns out that the acceleration of cluster ions in the KEK digital accelerator does not yield desirable characteristics This is understood by using a parameter V for the equivalent acceleration voltage of an electrostatic accelerator, which is defined in terms of atomic mass unit m, mass number A and charge state Q of a cluster ion, maximum flux density B, and bending radius ρ in a circular accelerator ring: V1⁄2volt. For the purpose of obtaining high-energy cluster ions in a relatively compact accelerator, there are three possible scenarios: (i) small induction synchrotron with superconducting guiding magnets of 8.5 T; (ii) induction sector cyclotron; (iii) racetrack-shape fixed field induction accelerator. This issue will be discussed in detail from the viewpoint of beam physics
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