Applications of ferrites and ferromagnets in tuning rf cavities for accelerators
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
Traditionally ferrites have been used in accelerators for tuning rf cavities and in nonreciprocal devices controlling the power flow in rf accelerating systems. Recently, the development of cavity tuners based on perpendicularly biased ferrites has shown good progress. Yttrium iron garnet (YIG) is gradually replacing the traditional Ni Zn ferrites. The use of conventional parallel-biased Ni Zn ferrites for varying the frequency of accelerating cavities has the disadvantage of high saturation magnetization (4[pi][ital M][sub [ital s]]). This precludes practical operation in low magnetic loss regions. Different substitutions have been used with YIG to reduce its 4[pi][ital M][sub [ital s]], making it a practical candidate for perpendicular biasing operating in the saturation region. In addition, YIG is known for its low dielectric and magnetic losses. In this paper we give a short review of development in accelerator cavity tuners based on perpendicularly biased iron garnet ferrites. We use the operation of a 52 MHz stripline-based YIG tuner which we have tested at BNL as an example to demonstrate the advantages of using YIG in cavity tuners. We also discuss magnetic tuning techniques based on magnetostriction of Ni.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7274214
- Journal Information:
- Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 75:10; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fast ferrite tuner for the BNL synchrotron light source
Tuner of a Second Harmonic Cavity of the Fermilab Booster
Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
43 PARTICLE ACCELERATORS
430100 -- Particle Accelerators-- Design
Development
& Operation
ACCELERATORS
CAVITY RESONATORS
CHALCOGENIDES
CYCLIC ACCELERATORS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FERRIMAGNETIC MATERIALS
FERRITES
IRON COMPOUNDS
IRON OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
MATERIALS
METALS
NICKEL
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESONATORS
RF SYSTEMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES