Applications of ferrites and ferromagnets in tuning rf cavities for accelerators

Journal Article · Sun May 15 00:00:00 EDT 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.355662· OSTI ID:7274214

Hanna, S M ^[1]

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1. 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), Vol. 75:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
CYCLIC ACCELERATORS
CAVITY RESONATORS
FERRITES
MAGNETIC PROPERTIES
IRON OXIDES
MAGNETOSTRICTION
NICKEL
RF SYSTEMS
TUNING
YTTRIUM OXIDES
ACCELERATORS
CHALCOGENIDES
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FERRIMAGNETIC MATERIALS
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESONATORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
430100 - Particle Accelerators- Design
Development
& Operation