Design of the Radio-Frequency System for the 184-inch Cyclotron

Technical Report · Thu Oct 14 04:00:00 EST 1948

DOI:https://doi.org/10.2172/972036· OSTI ID:972036

McKenzie, K R; Schmidt, F H; Woodyard, J R; Wouters, L F

A description is given of the frequency-modulated oscillator end its associated rf circuits as used in the l84-inch cyclotron for accelerating deuterons to 190 million volts or alpha particles to 380 million volts. A 9C21 water cooled tube is used in a grounded-grid circuit which is tightly coupled to the single-dee resonant circuit so that the oscillator follows the frequency of the dee over the wide range required. During normal operation the oscillator delivers approximately 20 kw of rf power to the dee system at an efficiency of 60 percent, giving 20 kv at the front of the dee, although the oscillator is capable of considerably more output. The frequency is swept from 12.5 mc to 9.0 mc approximately 100 times per second by a rotating condenser connected to the dee by a half-wave transmission line. Much of the history of the design, and reasons for choices made, are given, as it is felt this may be useful to others designing frequency-modulated oscillators for cyclotrons.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Physics Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 972036
• Report Number(s): UCRL-64
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
ALPHA PARTICLES
CYCLOTRONS
DESIGN
DEUTERONS
EFFICIENCY
OSCILLATORS
POWER TRANSMISSION LINES
WATER