Engineering analysis of the APT cryomodules

Campbell, B.; Chan, K.C.D.; Fagan, Michael J.; Valicenti, R.; Waynert, J. A.

doi:10.1109/pac.1999.795537

Cited by 4 publications

(4 citation statements)

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“…During cryomodule design development, the following basic guidelines were used: (1) Where possible, adopt concepts and components from previous programs. [5], (a) it must be upgradable to 100 mA operations for tritium production.…”

Section: Conceptual Design Developmentmentioning

confidence: 99%

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ADTF spoke cavity cryomodule concept

Kelley¹,

Roybal²,

LaFave³

et al. 2002

AIP Conference Proceedings

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The Accelerator Driven Test Facility (ADTF) is being developed as a reactor concepts test bed for transmutation of nuclear waste. A 13.3 mA continuous-wave (CW) proton beam will be accelerated to 600 MeV and impinged on a spallation target. The subsequent neutron shower is used to create a nuclear reaction within a subcritical assembly of waste material that reduces the waste half-life from the order of 10 5 years to 10 2 years. Additionally, significant energy is produced that can be used to generate electrical power.The ADTF proton accelerator consists of room-temperature (RT) structures that accelerate the beam to 6.7-MeV and superconducting (SC) elements that boost the beam's energy to 600-MeV. Traditional SC elliptical cavities experience structural difficulties at low energies due to their geometry. Therefore, stiff-structured SC spoke cavities have been adopted for the energy range between 6.7 and 109 MeV. Elliptical cavities are used at the higher energies. This paper describes a multi-spoke-cavity cryomodule concept for ADTF.

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Section: Conceptual Design Developmentmentioning

confidence: 99%

“…3). A modified Ledford/Wood tuner used for the APT program was adopted [5]. The cavity stiffeners are used to transfer the tuning load through the helium vessel back to the cavity where it is balanced by the load on the beam tube.…”

Section: Conceptual Design Developmentmentioning

confidence: 99%

ADTF spoke cavity cryomodule concept

Kelley¹,

Roybal²,

LaFave³

et al. 2002

AIP Conference Proceedings

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“…A modular approach was adopted that will reduce the total engineering and design effort required to produce these cryomodules. Detailed descriptions for the cryomodule designs have been published [1]. The β=0.64 ED&D cryomodule is pictured in Figures 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

Engineering analysis of the APT cryomodules

Campbell

Chan²,

Fagan

et al. 1999

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The superconducting radio frequency (SRF) part of the Accelerator Production of Tritium (APT) linac will accelerate a 100-mA proton beam from 217 MeV to 1700 MeV. Since SRF cavities can accept protons over a wide velocity range, cavities with only two different betas are required; however, three different length cryomodules are required. A modular design was adopted that will reduce the engineering and design effort to produce these cryomodules. A final design of the APT Engineering Development and Demonstration (ED&D) cryomodule for a two-cavity β=0.64 cryomodule has been completed, and a single cryomodule will be fabricated by industry next year. The cavities will be cooled in a 2.15-K superfluid helium bath similar to the Continuous Electron Beam Accelerator (CEBAF) system. What sets the APT cryomodules apart is the high radio frequency (RF) power that must be delivered to the cavities. The RF losses in the cavities and power couplers place a large heat load on the central helium liquifier. Minimizing these loads required extensive iterations of the power coupler cooling schemes and thermal shield. A spoke support arrangement was developed to keep the beam centerline fixed and to minimize forces acting on the helium vessel/cavity during cool down. Laminar flow through the cryomodule during clean room assembly dictated the use of a vacuum vessel with large top and bottom openings. Analyses were performed to ensure structural integrity under vacuum loading, while also minimizing vessel deflections which could impact beam centerline positioning.The structural/thermal analysis used to optimize the cryomodule design will be presented in this paper.

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“…This vacuum tank uses the same design approach as was used in the CERN-LEP "wrap-up" cryomodule [1], [2]. The approach maximises accessibility to the cryomodule.…”

Section: Vacuum Tankmentioning

confidence: 99%

APT cryomodule assembly process and mockup model

Campbell

Chan²,

Newman³

et al.

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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The cryomodule for the APT β=0.64 high energy accelerator incorporates either two or three RF cavities, two sets of magnetic shields, one active heat shield, multilayer insulation blankets, cryogenic plumbing for the shields and cavities, power couplers, cavity spokes and cavity frequency tuners. Maintaining cavity cleanliness is the most important aspect of the cryomodule assembly. The clean assembly of the cryomodule is done in a class 100 clean room. The final assembly, such as tungsten inert gas welding used to join the cryogenic plumbing, is done in a controlled environment. To address the assembly issues early in the design process, a full-scale mock-up of the entire cryomodule was fabricated. In this paper we will also describe the assembly process, and illustrate how the mock-up facilitated the procedures.

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Engineering analysis of the APT cryomodules

Cited by 4 publications

References 1 publication

ADTF spoke cavity cryomodule concept

ADTF spoke cavity cryomodule concept

Engineering analysis of the APT cryomodules

APT cryomodule assembly process and mockup model

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