RF Cavities with Transversely Biased Ferrite Tuning

Earley et al.1 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 micr...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on nuclear science Vol. 32; no. 5; pp. 2951 - 2953
Main Authors Smythe, W. R., Brophy, T. G., Carlini, R. D., Friedrichs, C. C., Grisham, D. L., Spalek, G., Wilkerson, L. C.
Format Journal Article
LanguageEnglish
Published IEEE 01.10.1985
Subjects
Ferrites
Laboratories
Magnetic field measurement
Permeability
Power dissipation
Power measurement
Radio frequency
Saturation magnetization
Synchrotrons
Toroidal magnetic fields
Online AccessGet full text

Cover

More Information
Summary:Earley et al.1 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/cm3 . A cavity design for a 6 GeV, high current, rapid cycling synchrotron using transversely biased ferrite tuning is described.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.1985.4334237