Speaker
Description
Ion beam analysis is typically based on tandem
accelerators and negative ions. The required 5-20
MeV energies for heavy ion time-of-flight elastic
recoil detection analysis (ToF-ERDA) can be
achieved with a high charge state ion source and RFQ
accelerator. We present a conceptual design of a ToFERDA
facility based on a permanent magnet ECRIS
and variable frequency RFQ accelerating 1-10 pnA of
40Ar8+, 84Kr17+ and 129Xe24+ ions to 4-7, 10-15
and 13-20 MeV. We present the PM ECRIS
requirements focusing on the CUBE-ECRIS* with a
quadrupole min-B field topology. Beam dynamics
studies demonstrating good transmission of the
heavy ion beams from the ion source to the RFQ
entrance through the electrostatic low energy beam
transport (LEBT) and a permanent magnet dipole are
presented. The predicted LEBT transmissions of the
CUBE-ECRIS (rectangular extraction slit) and a
conventional ECRIS (circular extraction aperture) are
compared. The conceptual design of the RFQ is
described and the implications of the energy spread
on the high energy beam transport are discussed. It
is demonstrated that an energy spread below 0.2 %
is necessary for appropriate resolution of the heavy
ion ToF-ERDA.