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Languages : en
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Four types of superconducting accelerator structures are being developed for use in a low velocity positive-ion injector linac for the ATLAS heavy-ion accelerator. Prototypes of the first two of these have been tested. The structures are all variants of a quarter-wave line terminated with a four-gap interdigital drift-tube array. The two structure types so far tested operate at 48.5 mHz and have an active length of 10 cm (for the particle velocity - 008c type) and 16.5 cm (for the velocity - 014c type). Effective accelerating fields of 10 MV/m have been achieved with the 10 cm structure, corresponding to an effective accelerating potential of 1 MV. The 16.5 cm structure has been operated at field levels of 6 MV/m, also giving an effective potential of 1 MV. Prototypes of the remaining two resonant geometries are under construction.
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Languages : en
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Four types of superconducting accelerator structures are being developed for use in a low velocity positive-ion injector linac for the ATLAS heavy-ion accelerator. Prototypes of the first two of these have been tested. The structures are all variants of a quarter-wave line terminated with a four-gap interdigital drift-tube array. The two structure types so far tested operate at 48.5 mHz and have an active length of 10 cm (for the particle velocity - 008c type) and 16.5 cm (for the velocity - 014c type). Effective accelerating fields of 10 MV/m have been achieved with the 10 cm structure, corresponding to an effective accelerating potential of 1 MV. The 16.5 cm structure has been operated at field levels of 6 MV/m, also giving an effective potential of 1 MV. Prototypes of the remaining two resonant geometries are under construction.
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Languages : en
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Four types of superconducting accelerating structures are being developed for use in a low-velocity positive-ion injector linac planned for ATLAS heavy-ion accelerator. A prototype of the first of these, an interdigital four-gap structure, has been completed and tested at accelerating gradients up to 10 MV/m, corresponding to a maximum surface electric field of 40 MV/m and an effective accelerating potential of 1 MV/resonator. The 48.5 MHz resonant cavity has an active length of 10 cm and is designed for particle velocities in the range 0.007c
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Languages : en
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A low-velocity superconducting linac has been developed as part of a positive-ion injector system, which is replacing a 9 MV tandem as the injector for the ATLAS accelerator. The linac consists of an independently phased array of resonators, and is designed to accelerate various ions over a velocity range .008
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Category : Power resources
Languages : en
Pages : 332
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Languages : en
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A very low velocity superconducting heavy-ion linac is proposed which, at least for applications requiring modest beam current, seems to have substantial cost and performance advantages over existing low-velocity room-temperature structures. The proposed linac, together with a 350 kV positive ion source, would replace an FN tandem Van de Graaff accelerator as the injector of the Argonne superconducting heavy-ion linac. 7 references, 5 figures.
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This paper reports the status of hardware development for the linac portion of the Argonne tandem-linac accelerator system (ATLAS). The ATLAS superconducting linac consists of an independent-phased array of 45 superconducting niobium resonators of the split-ring type. The linac has been operating in its present form since 1985, on a 24-hours per day, 5 days per week schedule. An upgrade of the ATLAS system is currently under construction the positive-ion injector (PII). The PII system will consist of an ECR positive-ion source mounted on a high-voltage platform injecting a very-low-velocity superconducting linac. The completed system will provide for the acceleration of beams of mass up to uranium, and will replace the tandem electrostatic accelerator as the injector for ATLAS. The status of resonator development for the superconducting linac is reported in this paper. Accelerating gradients in the existing ATLAS linac are currently limited by excessive heating and rf loss in the fast-tuning system associated with each superconducting resonator. Development of an upgraded fast-tuning system is also reported here. 7 refs., 5 figs.
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Languages : en
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The present ATLAS configuration has two important limitations: relatively weak beam currents, and an inability to accelerate ions in the upper half of the periodic table. Both of these limitations are due to the tandem part of the system. The next step in the evolution of ATLAS is the development of a very low velocity linac for a positive-ion injector to replace the tandem as the injector of the present superconducting linac. This development is expected to increase substantially the available beam current, and also to extend the mass range of the accelerator system, eventually to uranium.
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Category : Aeronautics
Languages : en
Pages : 594
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Author: DIANE Publishing Company
Publisher: DIANE Publishing
ISBN: 9780788103766
Category :
Languages : en
Pages : 130
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Category :
Languages : en
Pages : 4
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