RF-phase measurement and optimization for the Variable Energy Cyclotron, Calcutta

For improving the beam quality in a cyclotron it is necessary that the radio frequency phase of the internal beam be optimized. For this purpose the phases have been measured by two techniques, viz., the Smith-Garren procedure and the Prompt Gamma method at various radii. A prompt gamma setup has been developed and installed at the Variable Energy Cyclotron, Calcutta. The measured phases have been used to find out the changes in the currents of various trim coils. A procedure for minimizing the phases has been given and the first results have been discussed. (author)