Reducing ferrite tuner power loss by bias field rotation

Conference · Mon Aug 01 00:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:5436556

Smythe, W R

It has been suggested that ferrite tuners for rf cavities with the magnetic bias field perpendicular to the rf magnetic field would have greatly reduced rf losses. Recent measurements at Los Alamos National Laboratory appear to confirm this effect. A simple model proposed here allows the calculation of tuning characteristics for a variety of bias schemes. The model shows that the perpendicular bias scheme mentioned above requires very much larger bias levels than does the parallel bias scheme in order to achieve the same tuning range with a particular ferrite tuner. However, further investigation with the model has led to the discovery that the use of perpendicular bias at low frequency and parallel bias at high frequency requires only a modest increase in the bias field. In effect, the ferrite is kept highly magnetized, reducing ferrite losses, and is tuned primarily by rotating the bias field direction with respect to the rf field direction. The resulting reduction in dissipation can significantly reduce the amount of ferrite required per cavity.

• Research Organization: Nuclear Physics Lab., Univ. of Colorado, Boulder, CO 80309
• OSTI ID: 5436556
• Report Number(s): CONF-830311-
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. NS-30:4; Conference: Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CAVITY RESONATORS
DISSIPATION FACTOR
MAGNETIC FIELD CONFIGURATIONS
TUNING
ROTATION
DESIGN
FERRITE
FREQUENCY RANGE
LASL
RF SYSTEMS
ALLOYS
CARBON ADDITIONS
ELECTRONIC EQUIPMENT
EQUIPMENT
IRON ALLOYS
MOTION
NATIONAL ORGANIZATIONS
RESONATORS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
430300* - Particle Accelerators- Auxiliaries & Components