Invited Paper-Single Turn Extraction

The salient features of the resonance extractio ystem for the MSU cyclotron have already been described in a series of studies includings the generation of turn separation via the resonance mechanism, the design calculations for the electrostatic and magnetic channels, and the development of the air-core magnetic channel. A report issued in connection with this conference describes the status and presents pertinent data on the performanc of the cyclotron, including the extraction system. Since the issuing of that report, the electrostatic channel has been installed for preliminary tests. Experiments have verified that a suitable field bump drives the beam into this channel with clean turn separation, and that the turn pattern observed under these conditions agrees with orbit computations; the upper part of Fig. 1 shows the turn patter obtained from the differential and integral probe with the deflector in place (the azimuth of the probe is 160° before that of the channel entrance). The air-core magnetic channel is approaching completion and when this channel is installed, the extraction system will beame fully operational.