A Cyclotron Which Allows the Accelerated Particles to Emerge in a Direction Parallel to the Dee Interface

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Abstract
The construction of the dees, deflection channel, and vacuum chamber of a cyclotron is described. The design allows the accelerated ions to pass through an electrostatic deflecting field for one‐quarter of a revolution and then to proceed through the magnetic fringing field for another quarter of a revolution before they leave the cyclotron vacuum chamber. This provides that the ions emerge in a direction which is parallel to the dee interface and perpendicular to the principal azimuthal plane through the long axis of the cyclotron magnet. Operation shows that the ions follow the prescribed path. The advantages of this construction are: 1. Relatively low deflection voltages are necessary. 2. Large beam currents (100 μa) mono‐energetic to 2 percent can be obtained directly from the cyclotron. 3. It is easy to ``pipe'' the beam to a point many feet from the cyclotron. Therefore, many experiments can be performed outside of shielding tanks (4 feet of water) where possible errors due to background radiations from the cyclotron are small. 4. Magnetic analyzing equipment placed in the beam path provides a beam current density of approximately 0.001 μa/mm2 and mono‐energetic to 0.1 percent. Several curves showing typical operational characteristics of a cyclotron are included.