Mechanical Design Upgrade of the APS Storage Ring Rf Cavity Tuner
Mechanical Design Upgrade of the APS Storage Ring Rf Cavity Tuner

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Published: 1997

Total Pages: 4

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The Advanced Photon Source (APS) storage ring (SR) rf system employs four banks of four spherical, single-cell resonant cavities. Each cavity is tuned by varying the cavity volume through insertion/retraction of a copper piston located at the circumference of the cavity and oriented perpendicular to the accelerator beam. During the commissioning of the APS SR, the tuners and cavity tuner ports were prone to extensive arcing and overheating. The existing tuners were modified to eliminate the problems, and two new, redesigned tuners were installed. In both cases marked improvements were obtained in the tuner mechanical performance. As measured by tuner piston and flange surface temperatures, tuner heating has been reduced by a factor of five in the new version. Redesign considerations discussed include tuner piston-to-housing alignment, tuner piston and housing materials and cooling configurations, and tuner piston sliding electrical contacts. The tuner redesign is also distinguished by a modular, more maintainable assembly.

Energy Research Abstracts
Energy Research Abstracts

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Published: 1994

Total Pages: 806

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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Higher-order Modes of Storage Ring Rf Cavities and Their Interaction with the Beam at the Advanced Photon Source (APS).
Higher-order Modes of Storage Ring Rf Cavities and Their Interaction with the Beam at the Advanced Photon Source (APS).

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Published: 1997

Total Pages: 6

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The higher-order modes (HOMs) of APS storage ring (SR) rf cavities and waveguides were measured under various operating conditions. The HOMs of the 352-MHz rf cavity can be one of the major contributors to the coupled bunch (CB) instability. The distribution of HOMs under various conditions of beam current, cavity temperature, cavity tuning, single-bunch and multi-bunch operation, and fill patterns, are presented. The HOMs' shunt impedance of the loaded cavities were also measured. The effect of stagger tuning of the 16 cavities and their waveguide system is compared, and the HOM dampers are examined.

Reduced Length Design of 9.8 MHz RF Accelerating Cavity for the Positron Accumulator Ring (PAR) of the Advanced Photon Source (APS).
Reduced Length Design of 9.8 MHz RF Accelerating Cavity for the Positron Accumulator Ring (PAR) of the Advanced Photon Source (APS).

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Published: 1993

Total Pages: 4

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A 9.8-MHz RF accelerating cavity is developed for the first harmonic system in the APS PAR and an aluminum unit is tested. The design goal si 40 kV at the accelerating gap, Q-factor of (approximately) 7,000 for the accelerating mode, 1.2-m diameter, 1.6-m length with good mechanical strength and stability. The design employs no dielectric or ferrite loading for tuning. The cavity is a plunger-loaded reentrant coaxial structure; the end of the inner conductor facing the wall has a piston-shaped loading structure which consists of a circular disk and a cylinder. The RF characteristic of the cavity was investigated using the URMEL-T and MAFIA programs. Compared with a coaxial structure with lumped element capacitive loading, this design gives improved RF characteristics.

Simulation of the APS Storage-ring Rf System
Simulation of the APS Storage-ring Rf System

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Published: 1997

Total Pages: 4

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A simulation model for the APS storage ring rf system has been developed that includes the effects of cavity impedances, longitudinal beam dynamics, and generator klystrons. The model predicts multiple-bunch longitudinal beam behavior and is used for feedback system design and stability analysis.

The Design of the RF Cavity for the Heavy Ion Storage Ring for Atomic Physics
The Design of the RF Cavity for the Heavy Ion Storage Ring for Atomic Physics

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Published: 1990

Total Pages: 19

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An rf cavity and drive system have been designed for the proposed Heavy Ion Storage Ring for Atomic Physics, '' HISTRAP, at Oak Ridge. A peak accelerating voltage of 2.5 kV per turn is required with a continuous tuning range from 200 kHz through 2.7 MHz. A single-gap, half-wave resonant configuration is used with biased ferrite tuning. The cavity structure is completely outside of the beam line/vacuum enclosure except for a single rf window that serves as an accelerating gap. Physical separation of the cavity and beam line permits in situ vacuum baking of the beam line components at 300°C. A prototype cavity was designed, built, and tested. Development of frequency synthesizer and tuner control circuitry is under way.

The Engineering Index Annual
The Engineering Index Annual

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Published: 1992

Total Pages: 2264

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Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.