A TOROIDAL ELECTROSTATIC DEFLECTOR SYSTEM AS INJECTOR TO THE HIGH-ENERGY SECTION OF A FOLDED TANDEM ACCELERATOR

For obtaining beams of higher energies, some of the existing single en ded Van de Graaff accelerators have been converted into folded tandem machines. Such a conversion requires a 180 degrees bending device at t he high-voltage terminal to serve as injector to the high-energy secti on. Magnetic dipoles are usually employed in such machines despite man y serious difficulties. As an alternative, the possibility of an elect rostatic deflector has been proposed as a suitable injector to the hig h energy section of small machines. Such a choice eliminates many of t he difficulties and also results in an improved ion optics and beam tr ansmission.