Model study on the reduction of RF leakage in the TRIUMF cyclotron

Conference · Tue Oct 01 04:00:00 EDT 1985 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6297776

Fong, K; Dohan, D A; Hutcheon, R; Pacak, V

Since the 1 MW RF cavity of the TRIUMF cyclotron is contained completely inside the vacuum chamber, RF leakage from the resonator cavity into the tank vacuum chamber can cause undesirable heating and damage to uncooled structures and diagnostic equipment. The cavity traversed by the beam outside the resonators has been successfully simulated with the two dimensional code SUPERFISH and the quasi-three-dimensional code RFQ3D. Numerical calculations using these codes and precise 1:10 model measurements show that the power coupling between the operating mode of the resonant cavity and the parasitic modes of the beam cavity depends on the voltage distribution along the dee gap, as well as on the frequencies and the field patterns of the parasitic modes. These parameters are quite sensitive to the geometries and imperfections of the centre post, the flux guides and the cantilevered hot arms. Adjustments of these geometries have achieved a significant reduction in the RF leakage in the model.

• Research Organization: TRIUMF, Vancouver, B.C.
• OSTI ID: 6297776
• Report Number(s): CONF-850504-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-32:5
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
CAVITY RESONATORS
COMPUTER CODES
COMPUTERIZED SIMULATION
COUPLING
CYCLIC ACCELERATORS
CYCLOTRONS
ELECTRIC FIELDS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY DEPENDENCE
ISOCHRONOUS CYCLOTRONS
LEAKS
OSCILLATION MODES
R CODES
RESONATORS
RF SYSTEMS
S CODES
SCALE MODELS
SIMULATION
STRUCTURAL MODELS
THREE-DIMENSIONAL CALCULATIONS
TRIUMF CYCLOTRON
TWO-DIMENSIONAL CALCULATIONS