Abstract
Design studies are well advanced for a 70″ cyclotron capable of accelerating protons of energy up to 50 MeV, and heavier ions to energies which depend on their charge to mass ratio. The cyclotron, if approved, will be built by the staff of the Rutherford Laboratory at Harwell for use at the Atomic Energy Research Establishment mainly for studies in radio-chemistry, radiation chemistry, and radiation effects in solids. In basic concept the machine resembles the Oak Ridge ORIC and the Berkeley 88″ machines. There are three ridges, providing a field which makes an angle of 48° to the circumference at the maximum orbit radius. The field shape under different working conditions will be controlled by a combination of correcting windings and voids. A tape controlled precision table of 24″ × 30″ traverse will be used with a pantograph to move the measuring head in field surveys. A 3:1 frequency range for the dee voltage will be provided by an amplifier feeding a line with a variable shorting mechanism. Extraction presents a difficult problem, not yet solved. A septum at positive potential, (with leading edge shielded by a cooled earth plate) is contemplated; on the inner side, plates will shape the field to provide a regenerator. Consideration is being given to the injection of heavy ions through a hole along the pole axis.
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