RF cavities with transversely biased ferrite tuning
Earley et al. suggested that ferrite tuned rf cavities have lower ferrite power dissipation if the ferrite bias field is perpendicular rather than parallel to the rf magnetic field. A 50-84 MHz cavity has been constructed in which ferrite can be biased either way. Low power measurements of six microwave ferrites show that the magnetic Q's of these ferrites under perpendicular bias are much higher than under parallel bias, and that the high Q region extends over a much wider range of rf permeability. TDK Y-5 ferrite was found to have a magnetic Q of 10,800, 4,800, 1,200 and 129 at rf permeabilities of 1.2, 2.4, 3.7 and 4.5, respectively. Measurements of perpendicularly biased ferrite at various power levels were made in a coaxial line cavity. The Q of Y-5 ferrite was found to decrease by less than a factor of 2 as the power density in the ferrite was increased to 1.3 W/cmT. A cavity design for a 6 GeV, high current, rapid cycling synchrotron using transversely biased ferrite tuning is described.
- Research Organization:
- Nuclear Physics Laboratory, University of Colorado, Boulder, CO
- OSTI ID:
- 6122256
- Report Number(s):
- CONF-850504-; TRN: 86-004223
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. NS-32:5; Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
- Country of Publication:
- United States
- Language:
- English
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CAVITY RESONATORS
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ELECTROMAGNETS
MAGNETIC FIELDS
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SYNCHROTRONS
ACCELERATORS
ALLOYS
CARBON ADDITIONS
CYCLIC ACCELERATORS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
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FREQUENCY RANGE
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETS
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430100* - Particle Accelerators- Design
Development
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